jeting for 450R carb on 400ex

[curious george]

i had a dyno jet 142 main with the eclip 2 notches down on the needle(mybe three cant remember) and the fual mixture screw turned out 3turns on my stock 400ex carb. i need to know what i need to do for this 450R 04' carb i have it will not run right at all. it is getting to much fuel. it will run like 1/4 throttle if you snap it it will dye and if you give more then 1/2 it will dye out as well in any gear but neutral. i have the fuel mixture srew out 1 1/2 turns.

what should i do please help!



i have an fmf slip on that is it for that modifacations there. closed air box.

[latheboy]

I would try about a 170 main or so. I dunno what that is equal to in a dynojet. I have a 450r carb, full exaust, open airbox and a stage 2 cam and I run a 200 main (keihn). Also, I tried to "rev tune" it when I first put the carb on. That didnt work. Run the stock pilot (48), or maybe a 50. Start with a 160-170 jet and go out and run it. My airscrew is out 2 turns. When i let mine idle, i cannot just snap the throttle open, it will die. BUT when you got out and run it, under load(in gear), it runs awesome. Good luck.

[ahatcher21]

First of all George, I left you a pm and you never replied. I thought you had already done this to your ride and I needed help. I've since then spent the last three weeks tring to get mine going. Here's what I got. I have the stock 48 pilot in it. It is out 2 3/4 turns. It is snappy, no stall. I haven't found out which main I need yet, but I can tell you this. A 170 dyno jet isn't enough jet. I am going to stick with keihin. I figure about a 145 or so. I will know before this weekend is out. Your e-clip should be in slot 3 from the bottom. (needle pointing down) I have a slight stutter in the idle with this pilot jet. I'm going to open the A/F screw another 1/4 turn and see where that puts me. I may go with a 50 pilot and move the A/F screw in more. The stock jet that come in the carb is way to small. It will idle fine and then fall flat on it's *** when you juice it. Also I live in Michigan. Check your altitude against that and make your needed corrections.

[ahatcher21]

First of all George, I left you a pm and you never replied. I thought you had already done this to your ride and I needed help. I've since then spent the last three weeks tring to get mine going. Here's what I got. I have the stock 48 pilot in it. It is out 2 3/4 turns. It is snappy, no stall. I haven't found out which main I need yet, but I can tell you this. A 170 dyno jet isn't enough jet. I am going to stick with keihin. I figure about a 145 or so. I will know before this weekend is out. Your e-clip should be in slot 3 from the bottom. (needle pointing down) I have a slight stutter in the idle with this pilot jet. I'm going to open the A/F screw another 1/4 turn and see where that puts me. I may go with a 50 pilot and move the A/F screw in more. The stock jet that come in the carb is way to small. It will idle fine and then fall flat on it's *** when you juice it. Also I live in Michigan. Check your altitude against that and make your needed corrections.

[jsmith2232]

I'm putting one in next week but be careful on the conversions between dynojet and kehien there is a chart in one of the jetting forums try a search for it. FYI a dynojet 170 is equivelant to a kehien 190

[ahatcher21]

First of all, I'm not sure why my last post shows up twice, thats crazy. Here's the final results so far. I have a 50 pilot in it, A/F screw is out 3 1/2 turns. I have a keihin 190 main in it. It was ideling smoothly, and was running good through the middle and upper rpm range until I bumped the chip. I'm may go back in and put a 52 pilot in there so I can bring my A/F screw in more, but all in all she running good. Now yesterday in Michigan it was rainy and cool. The temp was around 50 degrees, so I'm sure I have enough main jet. As it gets warmer I may have to bump it down a bit. There is a slight hesitation when you mash the throttle from idle, but it's not to bad. If you have any questions email me at polarisboy21@juno.com

Alan

[jsmith2232]

how noticable are the gains by putting the 450 carb in.

[latheboy]

In my case, VERY noticeable. If your piped, and cammed, you need a bigger carb.

[ahatcher21]

I don't have a cam, but I do have a slip on. I can't really tell yet about the gains. It was raining yesterday and I could only rip it up and down the street. no more than third gear. It feels really good but I'm not for sure until I line up against my buddy.

I dont agree with latheboy, maybe piped, cammed, and bored.. but piped and cammed doesent need new carb. I have a freind who has stock carb on a KFX436 or some bore around that, 13:1 piston, stage 2 cams..

actually there aint a signle thing wrong with it :p

his money not mine?? :rolleyes:

[latheboy]

Agree, disagree, thats ok. But if you cam and pipe, you are trying to get air in and out faster. And a bigger carb will also help get air in faster, especialy a slide carb. btw, Im running a 426. lol

[BORY]

what do u think i should u for jets??

mods
416 11:1
hrc cam
p&p
full yoshi
open air box

??????

[curious george]

thanx for the help you guys i am going to buy a 450R dyno jet kit and see how it owrks out for my.

[jsmith2232]

BORY, I am in the process of putting the 450r carb on mine i'll finish it tonight hopefully but i'm starting with a 198 main and stock needle and pilot, fuel screw at 2.5 turns out. i'll keep you posted on how it works.

[BORY]

Originally posted by jsmith2232
BORY, I am in the process of putting the 450r carb on mine i'll finish it tonight hopefully but i'm starting with a 198 main and stock needle and pilot, fuel screw at 2.5 turns out. i'll keep you posted on how it works. alright sweet.

[jsmith2232]

I did some fine tuning today after 70 miles of trail riding yesterday with it and ended up using a 205 main, 3 turns out on fuel screw and needle in the 4th spot from top.

[BORY]

Originally posted by jsmith2232
I did some fine tuning today after 70 miles of trail riding yesterday with it and ended up using a 205 main, 3 turns out on fuel screw and needle in the 4th spot from top. what kind of jets??

[latheboy]

Sounds comperable to my setup. I have a k200 in now, prob could go to a 205. Did you notice a few more HP?

[jsmith2232]

all of the jets are keihen, and i think i lost a bit of the snap to the bottom end but i definetly notice it when she gets opened up. I just got razr IIs all the way around and with that carb last night i dragged my buddies piped 06 yfz 450 and had him by about 1.5 quad lengths until i was pinned in 5th then he slowly cought up but if it was a 300 foot drag i woulda had him hands down.

[jsmith2232]

I just dropped my needle to the 3rd notch and did a spark plug check with the 205 in it and it looks lean so i put in the 210 and shes right on. has anyone bumped up pilot sizes, i think i need to do that also.

[Live2Ride300]

I'm running the 450R carb on my 440EX.

Ive got a wiseco 11:1 compression 89mm piston.
Hot cams stage 2 cam
Head is ported
heavy duty studs/timing chain

I'm running a 170main jet, needle clip in the middle and 48 pilot and it runs awesome, instant throttle response. Pulls very heard throughout the entire RPM range.

[curious george]

i should be getting my jet kit in the mail today.

[pmptrk]

I have an 05 450r carb on my 426 and have no signs of a rich condition with a 230 main (the biggest available) and 50 pilot. Obviously something is not right. I have the hot start hole plugged with silicone, but air has got to be coming from somewhere. I even tried it with the fuel screw out 3 turns. Still higher on the pilot maybe?? Any suggestions?

[Live2Ride300]

Thats interesting, what brand of jet are you using?

[pmptrk]

keihin jets. The only way I can get it to show rich is to give it a little throttle and put the choke on. Without giving it throttle it immediately dies when the choke is even slightly applied.

[jsmith2232]

I am running a 210 main in my 416 and the plug looks to be nowhere near having signs of being rich, I think i need a larger pilot to help with starting. I still think that my stock carb had more pep to it on the bottom end but the 450r's carb has alot more once shes opened and revving, has anyone else noticed this and also I removed my choke from my stock carb has anyone done this to the 450r's carb?

[pmptrk]

Maybe I will just try going with a 52 pilot and possibly moving my needle a clip. I know there is a difference from quad to quad, but I don't see how it could be this much, maybe it is just the nebraska air???

I think this carb is all around better than stock and haven't even had it jetted right yet. The easier thumb tension was worth the money to me:D

[jsmith2232]

I'm on the 3rd notch on the needle now, it was at the 5th when i put it in because i never checked to see where it was and it cut out bad doing wheelies so i went to 4th and it got better now it is at 3rd and better yet.

[flauge]

Im thinking about getting me a 450 carb too. Do yall think i would get a noticeable gain from it?? All I have is a pipe and filter for now.. but i plan on getting a cam sometime tho...Would it make a difference on mine?

[jsmith2232]

yes.

[curious george]

i love this carb

[jsmith2232]

Originally posted by curious george
i love this carb

ditto the above, I had mine up to silver on memorial sunday and never lost a drag to another 400, even ate some 450's. Once the throttle is opened up this carb really eats.

[curious george]

does anybody know if you can wire in the TPS sensor?

[babiak400ex]

Hello! I just install a 450r carb on my 400ex. I cant say that I have noticed a signifigant differnce yet. I would have to say throttle response is better. A little more time to tune it in should prove a more noticeable difference. Maybe when I take it back to the 1/8 mile it will show more of an improvement than I can tell. I have only rode it once out on county rodes though.

[BORY]

do u think going up to a 50 or 52 pilot with a 210 main is to much bc i ordered a 208 210 212 and 50 52 to mess around with. what u think??

[jsmith2232]

no. i'm running a 210 right now and i think i need to go up to a 50 pilot

[curious george]

i am running a dyno jet 112 with the fuel mixture screw out 3 turns and the e clip on the dyno jey needle down three notches. i would like to wire in the tps sensor but have not quit figured it out yet.

[BORY]

i put my 210/50 in last night and took it for a rip but it still seemed like if u were cruising low 1st and punched it it bogged for a little bit then it blasted down the street that normal for u guys??

[babiak400ex]

Just letting whoever might be interested I took my 400ex back to 1/8 mile drag strip with my 450r carb installed I went from a best run last time of a 9.91 sec. @ 63.29 mph with the old stock carb to a best run of 9.50 sec. @ 68.19 mph with the 450r carb.
That is definatly worth the mod to me!

[jsmith2232]

BORY, I don't think that the 450 carb has quite the initial snap that my 400ex carb had but once it's opened up then it definitely added power thru the mid and upper.

[flauge]

Originally posted by babiak400ex
Just letting whoever might be interested I took my 400ex back to 1/8 mile drag strip with my 450r carb installed I went from a best run last time of a 9.91 sec. @ 63.29 mph with the old stock carb to a best run of 9.50 sec. @ 68.19 mph with the 450r carb.
That is definatly worth the mod to me! Dammm... that thing cut almost a half a sec off of your 1/8 mile time! i know im getting one now:D

[smartypants]

You guys running 200+ mains have got to be running rich. I"ve seen 400ex strokers running smaller mains.

I run a 155 in my fully built 416. I started with a 180 and it ran and ran good, I kept going down and it ran better with each size.

Drop the jet and I bet your quads run better than it already does.

[sixer3]

my jetting for 450r carb


210main/48pilot/2 and 1/2 turns on screw

no airbox w k&n and outerwear
stage 1 hotcam
426 no headwork
hmf slip on

SEA LEVEL

as i rose my main jet the hestitation from the crack of the throttle decreased.

the response is really good now and doesnt seem to be too rich at wide-open throttle but i still need to take it out to do plug checks, but the response is so good right now im scared to drop the main!!

[jsmith2232]

I started out at a 198 then 205 then stuck with the 210 I have less hesitation with it and even with the 205 the plug still looked a bit white, now its a nice golden brown.

[GPracer2500]

Originally posted by smartypants
You guys running 200+ mains have got to be running rich. I"ve seen 400ex strokers running smaller mains.

I run a 155 in my fully built 416. I started with a 180 and it ran and ran good, I kept going down and it ran better with each size.

Drop the jet and I bet your quads run better than it already does.

I can't help but agree. The huge mains just don't seem to make sense. :confused:

[jsmith2232]

I know it sounds crazy but with a stock carb i had to run a 170 dynojet, (190kehien) to get it so it wasn't lean.

[GPracer2500]

How are you evaluating lean vs. rich?

I would NOT reccomend plug readings. There is a surprising amount of misinformation about using plug readings for performance tuning and air/fuel ratio evaluation. Most people interpret plugs as being lean when they are not.

[babiak400ex]

I bought my 42mm 450 carb used off ebay I was told it had the hrc mods which consisted of just a 185 main jet. I checked and it was a 185, and differnt needle I believe. The fuel mixture was like 3 turns out, clip in the center. I dont know what the pilot is. Any way I just mounted the carb set up just the way I received it with the exception of adding my dial-a-jet. It idled a little high.It wasnt in the throttle cable so I adjusted the screw on the top of the carb 1/2 turn. I dont even know what it is. I was guessing it was for the adustment of pilot. Anyway it fixed the high rev. I took it to the 1/8th mile I picked up .4 of a sec and 5mph from previous best with the old stock carb. With the 185 jet and dial a jet set all the way lean it is like having a 190 app. It ran great 4 out of 5 passes I made that day till my last pass in the evening it cooled off about 10 degrees from earlier pass I was at the top of 4th gear about ready to shift to 5th and it popped and cut out. indicating to me it was too lean. Moral of my long story is 190 is a little too lean for my appilcation but it is a very easy and adjustible fix with just a click or 2 richer on the dail a jet. and that would put me around 195 or 200 where it seems like most other people are running.

[babiak400ex]

Climate and altitude need to be considered too when looking at someone eles jetting . Arizona and Michigan are definatly differnt climates for sure And I beleive altitudes too. Just the slight drop in temp and humidity made mine run leaner than it had earlier in the day.

[curious george]

my quad was sold with the stock carb so i have a 450R carb for sale.

it comes with the 450R throttle cable($16) and a 450R jet kit(dyno jet kit $65) and of course the carb it self(bought brand new for $180) i will sell all for $200.00 shipped OBRO. i have the jetting set for stage 1 3000ft. no resanible opffer refused either.
my loss is your gain.

[smartypants]

Too many additives in fuel now a days to get an accurate plug reading.

Keep dropping the main until the motor backfires on decel, then go back up 1 size on the main and your good to go. That is a REAL way of knowing the jetting is correct.

Plug readings went out in the 70's and you know it is 2006, correct???

[acz440ex]

I don't know how much a 450r carb costs but I think just under $500 was well worth the money for my Doug Eichner Edelbrock. It does not have any jets. Only a needle. It comes with 3 needles. I had to put the small (lean) needle in mine. From that point on all I had to do was adjust the needle height a little, and that is done externally with no tools. The accelerator pump is adjusted externally too. My power gains were very impressive. I just raced a stock 450r and a Raptor with a full pipe and K&N. I pull ahead by about 3 quad lengths off the line and easily maintain that lead. I can't see any reason to ever use anything but Edelbrock. Oh yeah, I almost forgot. This carb is nowhere near as sensitive to temperature and altitude changes either. I'm tellin' ya. This carb rocks!

[deepcj7]

Can anyone tell me the difference between a hesitation and a bog when trying to tell if your carb is running to rich or to lean? For instance, coming out of a turn and whipping the throttle open to accelerate my bike will stumble a couple of times then get up and go. Thanks guys

[PismoLocal]

What is the stock pilot size on the 450r carb?

[okbeast]

You still got that 450r carb for sale?

[sburton1]

what a good starting poing for my 450r carb

im at sea leavel
mods are full exhausts with pipe, stock bore, uni filter with outerwears "lid off", wb rev box. i just need a good starting point with the pilot and the main so i can order them from jets r us. im guessing a 48 pilot but dont know on the mains does 170 sound to high?? thanks guys

[PismoLocal]

Do I have to plug the hole thats on the top of the carb by the throttle cable hole. I think its for some hot start thing-a-ma-jig. What am I supposed to put in there?

[AznxXxStunNa]

I'm in the market for a new carb. I'm looking to get a trx450r or a Keihin 39mm FCR carb. But from what i can see. trx450r would do very good for the buck. What setting do you guy recommend?(jets) Also dose anybody here got any good setting for the keihin 39mm FCR carb on a 400ex?

[leadfoot_52]

You guys with the hesitation or lean mixture need to put the HRC leak jet in your carbs.

[GPracer2500]

Originally posted by leadfoot_52
You guys with the hesitation or lean mixture need to put the HRC leak jet in your carbs.

The 04/05 450r carb does not have a leak jet.

[Def-e-nition]

Originally posted by GPracer2500
I can't help but agree. The huge mains just don't seem to make sense. :confused:

As you saw with my bike Gp - Only a dyno can really tell you whats what . Plug readings are simply too much guesswork , im afriad , or I'd have done it instead of forking out the dough for the dyno .

As a sidenote : Gp i took the bike for its first spin after the dyno : brilliantly flipped it , bending the handlebars and landing it on my right hand . Looks like a damn Melon now . Lovely stuff ...

The 155 main works really well in that standard carb , so I have to agree with going down in the sizes. remember that I told you it ran ok no matter what size jet i threw in ? I think the same should surely aply here . the main jet is maybe compensating through size , for other settings elsewhere ?

Overall , between the dynojet 17 suggestion , and then going to 155 main , i am pleased as punch with its performance .
Pity my hand is so Bloody sore after yesterdays 14 minutes in the saddle ....:(

[pmptrk]

I got mine dynod shortly after I built it to a 426. With the 450r carb, I was using a K185 main, needle in middle(stock), 55 pilot, & 2.5 turns out on fuel screw, because that is what felt the best to me. You can view the dyno results HERE (http://www.exriders.com/vbb/showthread.php?s=&threadid=258294), to see the fuel curve. The guy just played with the fuel screw a little to end up at 1 3/4 turns out, but said my other settings are perfect- so let me know if you have any different input.

[Def-e-nition]

pmptrk that looks fine .

he has done his work properly by leaning the bike out a bit at the beginning , then letting it richen up as you go down the line.
the reason I agree with him , is because some guys tend to aim for the Most power figure of 13:1 from the word Go .
what happens in practice , is that once the filter gets dirty , it starts to richen the mixture even more , so the bike starts running at the wrong A?F ratio , and burns too much unneccesary fuel .

So , he did his work ok . You can chill !! Im sure its not the slowest bike around , at that Hp figure you should be nailing it !

My bike at 31 Hp would take a thrashing from you , but its completely Stock .

Again , Im no expert , but 41 Hp is nice , Gpracer 2500 will be able to brief you better , i find the guy knows what he's on about , and gives good honest advice .

Enjoy the bike .

[adamsortega]

can any1 suggest jetting and pilots for my new carb?...i ride in ny, nj, and pa...i have a 440 kit, stage2 hotcam, yoshimura full system, and no airbox lid...

[stuntman_12]

I have the 05 450R Carb....

Where is the A/F mix screw?

Where is the pilot jet?

Is the main the jet sticking down from between the two floats? If so, mine is a 118??!!


My needle was already set on the third from the top...

Thanks for the help.....

[stuntman_12]

Please help guys... i've had this 416 for nearly 2 months!!! I really want to ride. It still has not rolled for me. I got the R carb on. The pilot is a 48, the main (I Think) is 118, the needle came in the 3rd position and i don't know where the A/F screw is. IT may be missing... i've heard that its on the top.


PLEASE HELP ME OUT... I have yet to even ride this quad... i got away from two stroke b/c of reliablity issues... now i'm frowning at this honda... PLEASE HELP!!! I WANNA RIDE!!!!!!:confused:

[Def-e-nition]

Dont blame the honda dude - blame the guy who fitted the carb !!!



usually a 4 stroke is never a headache .

[stuntman_12]

I put the carb on the bike.... i NEED to know where the a/f screw is. is a 118 main jet really big or small for a 416?....

[Def-e-nition]

patience daniel-son , patience ... either one of the 450 carb owners will read your post and help you , or - you could log onto the 450 site , and simply post the queestion again on that side regarding the 450 carb . Sadly i know little about the 450 carb situation on a 400 , or id help out .


The 450 forum should also be better for a quicker rply .

a bike with that carb set properly ought to fly sir .

[sburton1]

the air fuel mixture screw is on the bottom of the carb like an inch away from the main jet nut its the only flat head screw adjustment on the bottom of the carb. as for the main jet it depends on your elevation sea level id start out with a 170 main maby a little smaller and see how it runs from their. id turn the air fuel screw out 2 turns and see how she idles and put the float needle in the middle to start our with. you kinda have to goof with it for a while to get it right and do a search Gpracer is an expert on this subject and has made several posts on the workings of a carb. you have to know how the carb works before you start adjusting it.

laters cole

[Def-e-nition]

Originally posted by stuntman_12
I put the carb on the bike.... i NEED to know where the a/f screw is. is a 118 main jet really big or small for a 416?....

Make sure also whether its keihin or dynojet sizing dude .

170 , then the guy is talking dyno if Im not mistaken .

[stuntman_12]

Hey sburton 1... is ur name Cole? Just wondering cuz mine is too, ANYWHO.... my sizing is keihin b/c it has their lil half star design on the jets and it says it all over the carb. Thanks for the help guys... yall are helpin more than the 450 guys!!!

Now maybe as soon as my jet kit gets here i can throw in a smaller jet and ride!!!!!!

[jordan_m6]

I have bought an R carb and just thought of the power now. Any body tried this yet.

[flauge]

Originally posted by jordan_m6
I have bought an R carb and just thought of the power now. Any body tried this yet. Im wanting to try it, but i cant get myself to spend 100 dollars on it. By the looks of it tho it should help throttle response. I think i do remember a coulple guys round here running em on their 450 carbs. hopefully they'll chime in:cool:

[jordan_m6]

one of the guys i ride with has it in his YfZ and he says it helps but since he did all the motor work back in march or so i have not seen him ride it, seems to favor his warrior for the trails.

[jordan_m6]

ok, so it took me about 5 hours total to put the 450r carb on. took me 2 hours to mock up. then 3 hours to get the finish fit, did notice that the carb is a little tall (fixable). left the needle in stock position and put a 175dj in for the main and runs awsome.

The only problem i had was when i first got on to ride forgot to turn the gas on. oops!

I really noticed the difference once i was doing a power wheelie in 3rd. never really could do this in 3rd. thinking of getting a dyno tune after fixing my head gasket leak. think i mis torqed the right side.

[gorgette]

I got stage 1 hotcams
wisco piston stock bore
open air box
450r carb 170 main jet

what should be the correct jetting

[flauge]

Well, i put mine on today and it aint running good at all. It idles real rough, all it'll do is chop and lope. When i give it a lil bit of gas, like 10% it'll be smooth but it'll cough and backfire thru the intake. I let off of it from that and it'll go down to idle real slow and the exhaust will backfire a few times, sometimes pretty loud. I played around with the pilot, started with a 45k and even went down to a 38k. i ran the same every time. Theres a 172k for the main if that helps..
What else could cause this?? Maybe an air leak???If there is one i cant find it..:mad:

[lpmaster]

you need to go UP on the pilot and possiblky move the clip down one a 48 pilot or even 50 will do the trick and help eliminate "bog" as well once its dialed in lmk if oyu need more help, while its running spray carb spray on all the boot connections and see if the idle changes, that will tell u if you have an air leak or not

[flauge]

HHmm, i didnt think i'd need to go up to a 48.. I went back to the 45 before i gave up for the day, so i guess it cant hurt to do that.
What about this "hang" that it has when i let off of it.?? When i let off the gas it would take about a couple seconds to get back to idle, popping as it went down. Thats a first for me. :confused:
That carb spray trick sounds pretty good also, I'll try that on the next go round.. Thanks:cool:

[mcleod]

installed mine today, main jet is 170, 426cc wiseco 11:! k&n filter open box and fmf power core 4 slip-on.

fuel screw 1 3/4
stock slow jet.

[SSxtreme]

Watsup, I got a vacuum leak in my stock carb and have been thinking of buying an R carb instead of gettin a rebuild kit. I have a 10:1 weisco piston, and stage 2 hotcam. Is it worth buying and is it relatively easy to install? What jet size etc. do you guys recommend? and how much should I pay for a carb so I don't overspend. Thanks. Oh yeah and Im from NJ if that makes a diff.

[flauge]

You can get em on ebay pretty cheap, i got mine and a 450r throttle cable for like 70 something $$.., Already setup for a 400ex.. Installation is easy too, just bore out the intake boot and manifold for it to fit..;)

[mcleod]

http://www.axminster.co.uk/images/products/9415_l.jpg

this gonna be your friend for the installation!

i used it to elarge de air box boots and intake boots a bit, but be sure to remove the intake boot before doing this... bad thing can happend if you dont :)

paid mine 125 CAN$ with new throttle cable

[flauge]

I used a dremel with a sander roll bit. i had to run it real slow or it would try to melt the rubber.. turned out nice tho:cool:

[NFRASCONE]

Just put my R carb on tonight, backfired a few times... probably woke up the neighbors... time to ride it tomorrow and see what it does. I'm running a 175 main so far, I'll probably have to make some minor adjustments.

[flauge]

Good god man, this thing will get it, i mean get it!!! It just turns up sooo fast,its unreal!! I also found out that my stock carb was causing some kind of surging at WOt b/c now its gone with the 450 one so thats a plus too..:D
You were right lpmaster, I was too lean on the pilot.. I put the 48 in and turned the screw out like 3 turns i think.. Now it runs smooth and it'll rev up soon as i hit it.. One thing tho is that my idle is kinda high, i cant get it to go down either.
Anybody else have a high idle??

[NFRASCONE]

Got everything hooked up and tuned great, kept my 175 and made some minor adjustments. My idle is alittle high as well but not high enough to worry about. Thanks everyone for all the info, it really helped when I put this carb in last night.

[mcleod]

Originally posted by flauge

Anybody else have a high idle??

just be sure that the throtle goes all way back when releasing it :P

[flauge]

That was the first thing i checked but that looks good. I turned the idle knob back so far it'll turn easy, it still didnt go down tho.. I guess its something i'll have to live with, its not that bad. Its just a tad higher...

[mcleod]

you could be able to play with it a bit with the mixture screw too have you tried it yet?

[flauge]

I didnt think about that... That might have a lil to do with it b/c its still a bit lean on the pilot... I'll probably just go ahead and get a 50 pilot i guess, Im already at 3 turns on the 48..

[gorgette]

hello guys, i need more info about this r carb. It would be nice to have help :). What do you guys mean by 3 turns on the 48 pilot. Do you know what is the stock pilot on the r carb? I just bought it not too long ago. I only play with the main jet. The idle is good it does not rev but the throtle response could be more quick. When i go riding i put it full throtle but it seems to bog a bit to mutch.

- wiseco piston standard bore
- hotcams stage 1
- r carb
- open air box

need more info for jetting. Thank you verry mutch guys :)

[skull2002]

any dyno runs??? i have seen everything from 165 main to 210 main, 48 to 55 pilot, and on a lot of quads with similiar mods. i know they are all different, but i cant believe to that extreme.

[pmptrk]

Originally posted by skull2002
any dyno runs??? i have seen everything from 165 main to 210 main, 48 to 55 pilot, and on a lot of quads with similiar mods. i know they are all different, but i cant believe to that extreme.

Check my post on page 5

[gorgette]

pmptrk, I'm not able to see your dyno results view on p.5

[pmptrk]

I should work now, I dont know why/how the thread link got changed.

[gorgette]

yup, its working now. thanks :)

[gorgette]

Just let you know, my fuel screw is 4 turns out, when i get that carb is this ok. i put it to 3 turns out. should i turn it more in, like 2 turns? any suggestion? thanks a lot

[peecout]

I bought a 450r carb and have a stock 400ex with a pipe and no airbox lid. Do yuo think I should even bother with this carb, or just sell it?

[hondaracer57]

dude deff. use it!!!!

[AbnMP13]

Peecout, I'm interested if you decide to sell it.

[peecout]

I might just try to get some jets and play around with it a little. I will keep you posted though if I do decide to sell it. I have read every post on this thread and I am still confused to where I shoud start with my tuning. HELP!
I was thinking....
50 pilot
2 turns out
E clip #3 from bottom(needle down)
Kehin main???

[AbnMP13]

What other mods do you have?

I may could help on a 400 carb but have never messed with a 450. I would tell ya to start with a setting that you think will be lean, it'll save ya the hassle of fouling/buying plugs and the tell tale sign of being lean is backfiring on decel.

And please do keep me in mind for the carb. :D

[scruff_mcruff]

Originally posted by flauge
I didnt think about that... That might have a lil to do with it b/c its still a bit lean on the pilot... I'll probably just go ahead and get a 50 pilot i guess, Im already at 3 turns on the 48..

on a 4 stroke carb in on the screw is richer and out is lean. its opposite of the way it is on 2 strokes. you dont need to go bigger on the pilot. if you think your bike needs more fuel off idle than a 450 your out of your mind.

[flauge]

Originally posted by scruff_mcruff
on a 4 stroke carb in on the screw is richer and out is lean. its opposite of the way it is on 2 strokes. you dont need to go bigger on the pilot. if you think your bike needs more fuel off idle than a 450 your out of your mind. Hey i was thinking the same thing you are until i started tuning this carb, but beleive me it needs a lil more fuel than you think.. It still shows some signs of being lean, like some hesitation and a lil popping on decel. It might be the needle tho since the hesitation is around 1/2 throttle so i might try moving the clip down on that.
Btw,its out on the screw to richen and in to lean;)

[skull2002]

just put on the 450r carb. 185 k main, 55 k pilot , 1 3/4 out on screw. great throttle response,incredible pull thru every gear, and no exhaust pop on deceleration. i run cam2 fuel,110 octane. i took my time, made sure everything fit perfect, took me about 4 hours for complete dissassemble to test ride. it is an upgrade well worth the time!!!!!! and thanks for your help and info pmptrk.

[wrobben]

ive got a 2004 400ex with a k&n no airbox lid, aftermarket cdi box, and a modified stock exhaust basicly just has a 1" hole drilled in the baffle, im getting a 450r carb and just wondering if anybody knows a good spot to start with when jetting the carb for the 400.

[mcleod]

forget about that, i have made a mistake :p

[flauge]

Originally posted by wrobben
ive got a 2004 400ex with a k&n no airbox lid, aftermarket cdi box, and a modified stock exhaust basicly just has a 1" hole drilled in the baffle, im getting a 450r carb and just wondering if anybody knows a good spot to start with when jetting the carb for the 400. Id say start with the stock 48 pilot and put a 170-175k main in. That'll get ya close.

[Grant Casey]

hey my bike is about to get put back together, these r the mods,

11:1 89mm piston
hot cam stage2
port and polish
Uni filter
and a 450r carb that is ready 4 a jetting.

Wat is a good starting point 4 jetting on my 440ex.

my elevation is 400m

[wrobben]

Originally posted by flauge
Id say start with the stock 48 pilot and put a 170-175k main in. That'll get ya close.

Ok thanks anyone now what 170-175k main is = to in dynojet jets

[AbnMP13]

Check page 2 of this thread (http://www.exriders.com/vbb/showthread.php?s=&threadid=274089&perpage=15&pagenumber=2)

[EXSailor]

Allright guys, first of all I have read this post back and forth several times, and thanks to everyone who has posted on it sharing their knowledge and experience. I just got a steal on an 05 450r carb and let the jetting begin!!! I know what i'm starting with BUT........ I only have Dynjet mains. The carb has a k200 on it and my DJ's will fit but their is a bit of a size difference between the two. Will installing the appropriate jet size DJ main affect anything seeing as it is considerably shorter than the Keihins? see the attached pic to see my dilema.....

[EXSailor]

....The keihin jet is the bottom one

[flauge]

You'll be okay as long as you use Dj's main jet adapter with them, then it'll be the same length as the keihin.... If you dont have it tho you could give Dynojet a call and they'll send you one for like a few dollars.;)

[EXSailor]

sounds easy enough, thanks for the info. hey flauge, I noticed you're from mid east GA., you been to Durhamtown yet?

[flauge]

Man a few of my buddies went a couple weeks back and did'nt even tell me until yesterday:mad: .They said it was awsome and you'd have to stay more than a day to ride everewhere..Were planning on doing another trip up there sometime so maybe I'll be able to see it then. Actually I want to go there and to Aonia pass and to a few Sorcs races too in the upcoming months. I cant wait!:D

[sextonjd99]

I installed a 450r carb and I'm having troubles getting it to run right. I've got a full yoshi system and a K&N, 50 pilot, 190 main, 3 clip, 3 turns of air screw.

Ok heres the deal, Easter weekend go riding, 40 degrees or so, ran awesome on the top end but was getting popping and backfiring on decel and was sluggish in low rpms. I pulled the plug and it was white, which i though i means running lean, so i ordered a 52, 55 pilot.

Now last weekend with the same settings as weekend before, will only run with choke on. When i turn the choke off its starts backfiring through the carb. and wont idle, and has actully blown carb out of the boot! I checked the plug now and its all black.

Whats the deal anybody got any idea's or where to start to get the jetting correct?
Thanks in advance
Jason

[KJS]

Same problem lowered to 48 pilot raised to 185 main 3 full turns air screw. No backfire mid range screamer top good bottom good.But it wants to idle a little high fine with me .I am very pleased with results. 9-5-2007 Up to 190 main now still still strong

[flauge]

Ive tinkered with mine as much as i can and it still idles high. I guess its just something we'll have to live with:ermm:

[wrobben]

idk i think u may have to use the dynojet needle if u use the dynojet mains, my bike wouldnt start with the stock needle and dynojet jets

[wrobben]

also im running a 50 pilot, and a 155 dynojet main with the needle on the third notch from the top,
the 155 is close to the 170 Kehien supposed to be anyways, and i got the pilot screw turned out 3 turns, it idles a bit high so im gonna go in a half turn and c what happens.

[mcleod]

finally fine tune the idle, here is my final setup

50 slow jet
168 main keihen
2 turn 3/4 out on the fuel screw
3 row from the top on the needle

426ex wiseco 11:1
fmf slip-on
k&n filter


no more popping at idle/compression ! start better then a factory 400ex, respond like a beast!


:D

[EXSailor]

And now for my problem, I just test rode my 450r carb setup, here are my configs....stock 48 slow jet, 170dj main, 3 turns on fuel screw, 3rd position from bottom on needle. I tweeked it so it idles pretty good, my plug has a light tanish color on the side electrode, and the color on the ring down inside at the base of the insulator tip is the same color. I honestly don't feel much of a difference in power, and there is a moderate amount of popping on deceleration. I have a similar amount of mods to some other users in this thread, and there jetting is very similar to mine, but they seem to be very satisfied with their results. I don't have any other slow jets, and i've read of other riders making adjustments to that, as well as tweeking the fuel screw, but i've also read that you don't want to go out any more than 3 turns on the fuel screw......any ideas?

[flauge]

Not too sure about the main but you might need to go up a size on the pilot and down a slot on the needle. Im on the same needle position and pilot size as you and mine is on the border of being too lean. I could turn my fuel screw in maybe one turn and it'll start missing bad at idle, so yours should need a lil more fuel than mine scince yours has a lil more motor work done. :cool:

[EXSailor]

thanks alot flauge, looks like i'll be trying to get my hands on some slow jets. yesterday I found a k200 main and put that in, ran it and did a plug check. The plug got a hair darker (towards being rich), but my backfiring on decel did't change at all. So amidst my frustration I read another thread from GPracer and I decided to turn my fuel screw out to roughly 4-4 1/2 turns. once I did that my plug turned a faint shade of black, and the popping decreased a little. I think my biggest frustration is the power, I actually think its less than when I started. I useed to be able to do stand up wheelies in third relatively easy, now I am actually fighting to do it in second, not to mention the low end torque I used to have is gone. Oh well, i'll do some more tweeking and hope for the best I guess.

[flauge]

Man, somethings got to be a little bit off if it feels like its lost power. Keep trying on it, when you get it right it'll be worth it :devil: .
BTW Im gonna put a 50 pilot in mine tomarrow and drop the needle down one, so Ill let you know how that goes. Maybe that'll give you a lil bit of reference to where you need to go.;)

[feelthisroost11]

I have a question..i was looking for a 450r carb for my 440ex and i came across a 03 crf 450 carb and i was wondering if it was a trx related carb? Would it be the same installation as a trx carb?Do i need any adaptors if so? Thanks

[flauge]

Welp, i went from running perfect to running crappy again.. Before i messed with anything I was running a 48 pilot, needle in the middle, and a 172k main.. That was with 5 discs and a quiet core in my e series. Now I took out the quiet core and went up tio 13 discs and its running too lean. Blip the throttle and it'll hesitate, let off the gas it'll pop bad on decel. So... i went to a 50 pilot, went down a clip on the need, and poped a 175k main in. Its still doing the same thing.. Now i know its lean, but what should i adjust? Id figure the pilots okay scince i see a lot of people on here running the same pilot and they've got more built motors than mine. The needle oughta be ok. So would the main cause the poping on decel if it was too lean? I always thought it was the pilot.:ermm:
Also, if i hold the gas a lil bit above idle, it'll get really rough. It'll start snorting and skipping and sometimes cut off. AInt too sure what that is either but it aint good:uhoh:

[sextonjd99]

Thats the same thing mine did! I never did get it figured out, i just put the old one back on. If you get it figured out post up what you find.

[flauge]

Will do.. Im not gonna give up on it just yet b/c it ran perfect before so i know i can get it right again;) .

[jsmith2232]

It may sound rich but right now I'm running a 198k main and 48 pilot with the build listed in my sig, I was all the way upto a 210 main and I never fouled a plug but it was a big boggy. I will probably try going to a 190k main but right now she starts right up with no choke, Idles like a champ and doesn't pop on decel, and throttle response is awesome.

[flauge]

See, thats what i dont get.. youre on the 48 pilot with a 416 build like that and its running good, but mine will still pop on decel. Maybe I should go up on the main i guess.:ermm:

[jsmith2232]

Try turning your fuel screw out to 3 1/2 turns.

[flauge]

I think im at 2 1/2 to 3 turns right now, I'll try 3 1/2 turns this weekend, and mabye a 180k main before i race. You dont think it'll be too rich at WOT with that main do you? I kinda doubt it...:ermm:

[jsmith2232]

I don't think a 180k would be too rich at all, when I had my stock carb she was dialed in with a 170 dynojet equivelant to a 190k, I haven't run anything less then a 198k with the 450 carb and she hasn't fouled a plug yet.

[flauge]

Cool, i didnt really think it'd be. I guess Im just kinda paranoid about running out of gas at my first xc race. That'd be kind of a bummer.:ermm:

[r-exrider0003]

hey can any one help me out with proper jetting on a 426 with a hotcam stage 2 and a white bro promeg full system, k&n with no box ... i m located in IN 47125... thanks for any help...

[Ruby Soho]

what jetting you think i should put on the 450r carb with the wiseco 11:1 440, hotcams stage 3, stock exhaust?

[bigmikey119]

OK I have a 165 main 42 pilot needle 4th notch down were should this put me on a 05 450r carb plz help!

[jsmith2232]

You can check my jetting in my sig, I've had it running like this for almost a year and a half from temps below zero upto 95 deg F. and it always has excellent throttle response, no bogging, plug looks great and It hangs with most of the 450s.

[choco]

Originally posted by curious george
my quad was sold with the stock carb so i have a 450R carb for sale.

it comes with the 450R throttle cable($16) and a 450R jet kit(dyno jet kit $65) and of course the carb it self(bought brand new for $180) i will sell all for $200.00 shipped OBRO. i have the jetting set for stage 1 3000ft. no resanible opffer refused either.
my loss is your gain.

This still for sale?

[choco]

Originally posted by curious george
my quad was sold with the stock carb so i have a 450R carb for sale.

it comes with the 450R throttle cable($16) and a 450R jet kit(dyno jet kit $65) and of course the carb it self(bought brand new for $180) i will sell all for $200.00 shipped OBRO. i have the jetting set for stage 1 3000ft. no resanible opffer refused either.
my loss is your gain.

This still for sale?

[Wheelie]

Figured I'd add my results, as I completed the 450R carb install last weekend.

440 stroker 11:1 compression, HC Stg 3, P&P Head, Full Yoshi exhaust, K&N Filter--no lid. Right now it has a 50 pilot, mixture screw out 2.5 turns, needle in stock location and a 190 main. It's close to spot on.:macho

To anyone that hasn't done this mod yet, or are contemplating it. DO IT!! It's easy to install, and the power gains can't be beat for the $$.:macho

[medicdude]

nice setup wheelie. lol.
what altitude are you running at?

and i thought ii'd contribute.
see my sig for my setup.

[Wheelie]

Looks like we have similar setups, although your quad is a big bore--mine is poked and stroked (416/87mm piston, with a +4mm stroker).

I ride dunes and mountains, from 0-5000ft on a regular basis. The 190 is close at 3000ft. A 195 will be installed before my trip to Winchester Bay, OR this weekend.

[peecout]

I just got back from Winchester! Your gonna love it, weather was perfect!

I am still trying to figure out a good starting point as far as jetting with this carb on a stock 400ex with a pipe and K&N with open airbox??? Any suggestions?

[medicdude]

you guys need to post the altitude range and temp range you ride in, to get even a ballpark jetting figure.

[Ruby Soho]

ok guys, im picking up an 04 stock 450r carb in a few days. comes with stock jets.

my current engine mods are:

11:1, wiseco 440 piston, and hotcams stage 3 cams. with a stock exhaust, and a UNI air filter lid on.

elevation is about 585ft, the basic temp i ride in now is 60 degrees, and winter gets from 10-40 degrees. spring/summer is usually 75-80 degrees

what sizes do you think i should run?

[skatrdude20]

Any suggestions as where to start with the jetting for a 450r carb.

Mods-
Namura 440 Kit
Stage 2 Hotcam
Unifilter
Full HMF Exhaust

I need somewhere to start :eek2:

[dpiza]

ive read every single post trying to find one that would help me, couldnt really find one. Heres what i got 2003 400ex with supertrapp exaust, uni filter with lid, big gun rev box, stock piston for now, am goin to a 416 10.8 to 1 and a hot cam stage one soon. I just got a 05 450r carb and am lost on what to jet everything at. I live in central florida and very occasionally ride in georgia, so there is not a whole lot of elevation. any info would be great. thanks

[EMX5636]

So after reading through this thread numerous times, I finally get to add my .02. I just got finished installing the carb, and got to ride it and play with the jetting today. So far I'm sitting at a 50 pilot, around 2.5 turns out, 4th clip from top needle, K200 main but I'm bumping that up to a 205-210 tomorrow. I'm fairly confident in the way it runs now, good idle control, good midrange, little to no hesitations, just seems a bit lean top end. Some popping on decel hence the main increase. I'll update tomorrow after the new main goes in.

Justin W

engine mods are 440, hotcam, sparks exhaust, k&n w outerwear, no lid...

[EMX5636]

Alright, so my popping on decel i think wasnt' a good deciding factor for lean because i dropped the 205 in it, even raised the needle from the 4th to 2nd clip from top, and the popping got worse, with a flame every once in a while, so i think i'm actually a rich pop, which doesn't make sense to me....


Does anyone have any other rich/lean tips besides popping... I'm gonna throw another plug in it, and check that, but I'm kinda stumped.

Justin W

[zrpilot]

Originally posted by EMX5636
Alright, so my popping on decel i think wasnt' a good deciding factor for lean because i dropped the 205 in it, even raised the needle from the 4th to 2nd clip from top, and the popping got worse, with a flame every once in a while, so i think i'm actually a rich pop, which doesn't make sense to me....


Does anyone have any other rich/lean tips besides popping... I'm gonna throw another plug in it, and check that, but I'm kinda stumped.

Justin W

If your needle is on the second from the top going down then you have justed leaned it out. I would try a 50 pilot and the needle back on the middle position and a 175 main.

[EMX5636]

I know i leaned it out with the needle... I had the needle in the 4th where it was with the 200 jet, and it was worse, so i figured i'd try to lean it back a bit towards the 200, but it still does it. I'm gonna drop back down to the 195 that the carb came with for right now, and then see how it runs, then I'll get a couple more jets and go from there. Thanks though,

Justin W

btw, i already have the 50 pilot in it.

[EMX5636]

and one more thing i remembered. I pulled the jet out of the 400ex carb and the main was a 158. Same mods. So I don't know if that helps anyone. Ran great before. Hopefully I can get it running like that again.

[EMX5636]

Alright, so went back down to the 195 main, needle still 2nd from top. Plug doesn't look white, but does look like it's running kind of hot. Slight orange color on the end of the plug. Any ideas what's up with this? I am going to try raising the needle up one or two notches and see where that goes. Runs strong though...

[zrpilot]

Put that clip on the needle on the middle position!!!!

[cmaxx]

ok i just bought a 450r carb.i have a white bros e seris slip on,416 piston,removed air box,uni filter,i think thats it.what jets should i run?and do you think ill notice a big difrence?please help me.and what other mods should i do to it?

[BIGKURT666]

ware can i get a good jet kit i cant seem to find one lol n what do u guys think i should run with my set up?

[scruff_mcruff]

i just got done with the first trial run with a 42mm 450 carb, and that thing rips. my motor has a stock bore 11:1 piston and new HC stg 2 cam, with a White Bros. promeg headpipe and my own custom dual exhaust. i kept the stock jets in it and had the idle screw 1.25 turns out. thing ran like a champ never once sputtered or popped in a 30 min run. the main is a little fat but i like running the air cooled motors that way. its the first time since the stg 2 cam the front end would stand up coming out of turns and i use 16-38 gears w/ 18/9.5 tires. i live 25 ft above sea level and it was about 45deg today. hope this info helps someone out.

[Hondamaster5505]

Originally posted by scruff_mcruff
i just got done with the first trial run with a 42mm 450 carb, and that thing rips. my motor has a stock bore 11:1 piston and new HC stg 2 cam, with a White Bros. promeg headpipe and my own custom dual exhaust. i kept the stock jets in it and had the idle screw 1.25 turns out. thing ran like a champ never once sputtered or popped in a 30 min run. the main is a little fat but i like running the air cooled motors that way. its the first time since the stg 2 cam the front end would stand up coming out of turns and i use 16-38 gears w/ 18/9.5 tires. i live 25 ft above sea level and it was about 45deg today. hope this info helps someone out.

YO:eek2: You have any pics of the custom dual exhausts!

[scruff_mcruff]

Originally posted by Hondamaster5505
YO:eek2: You have any pics of the custom dual exhausts!

they are up in my myspace profile, havent had time to try and get then up here.

[Hondamaster5505]

dude, thats so awesome! Looks like a pretty neat installation.

How did you get the 2 pipes to go to the header?

[scruff_mcruff]

i just made my own collector, pretty simple stuff after building headers for cars.

[sdime400]

Anyone have jet settings for a 2000 400 ex w/ Rev box, full exhaust, stage one cam, and fully opened K&N for the 450r carb. And which jet kit would be the best.Gearing if anyone has it. Thanks:D

[mxpimp2000]

i have a 426 big bore kit on my 400ex with shaved fly wheel high comp. piston valve work and hot cam. i have a crf450 dirt bike carb on mine with no airbox lid you wouldnt believe the power it has ive raced 450's moded up and still smoke them no problem ive rode plenty 400ex's and 450's but none compare to the power the 426 has it will scream!!

[PowerMadd789XC]

hey guys, watsup , i was just wondering if anyone knows what the jetin would be for my stock 400 engine wiht a 450r carb and full lrd exhaust, and also dont run an air box , bc it wont run right with it on! i used to have a 440 kit but my crank snapped and shattered my case .. but if anyone can help me or give me any idea to get it close, id appriciate it , thankzzz!

[AZ440ex]

Hey everone,

Did anyone ever run a stock carb that has been ported then switch to a 450 carb? Any gains or loss?

I run my 440 with a pretty heavily ported stock carb and wonder if a 450 carb might be better.

[TRX406EX]

r 04-05 and 06+ 450r carbs the same?, if not, which is best?

[zrpilot]

The '04-'05 carbs are the ones eveyone is running. The '06 and newer are FCR flat slide and are different then the '04-'05.

[flauge]

Originally posted by PowerMadd789XC
hey guys, watsup , i was just wondering if anyone knows what the jetin would be for my stock 400 engine wiht a 450r carb and full lrd exhaust, and also dont run an air box , bc it wont run right with it on! i used to have a 440 kit but my crank snapped and shattered my case .. but if anyone can help me or give me any idea to get it close, id appriciate it , thankzzz! Start with like a 50-52 pilot and maybe around a 180 something main. That'd be a good starting point.;)

[cincy250R]

ok i have a 450r carb with a
175k main
48 pilot
needle clip in the middle
screw 2 1/2 out

sparks X6
no airbox lid
stock other than that

it idles really high when i let off the throttle and another thing i noticed was my header was glowing.... i know usally that means your running lean but i don't know what everyone elses is doing and it will hicup out of the intake when it is cold

it doesn't have an air leak i sprayed the boot while running with carb cleaner

-Dave

[zrpilot]

Originally posted by cincy250R
ok i have a 450r carb with a
175k main
48 pilot
needle clip in the middle
screw 2 1/2 out

sparks X6
no airbox lid
stock other than that

it idles really high when i let off the throttle and another thing i noticed was my header was glowing.... i know usally that means your running lean but i don't know what everyone elses is doing and it will hicup out of the intake when it is cold

it doesn't have an air leak i sprayed the boot while running with carb cleaner

-Dave

Dave,

What is the temp? If cold (probably :( ) don't forget to put 1-2 bigger mains to compensate for temp. Also drop the needle clip one notch (raising the needle)

Also try a 50 pilot then readjust fuel screw

Was it at night when you saw the header? If so, this is not unusual.

Mike

PS: I'm at a 175 with a 50 pilot and the needle clip DOWN one notch at 70F!!!!

[cincy250R]

well i was in my garage and just noticed that they were glowing but it was idling for like 10 min as i was trying to adjust the pilot screw but how do you find your elavation(spelling) and it's about 25-30 degrees out....another problem is that i can't ride ether cause i don't have all my suspension back yet.... sooooo i guess i'll just have too mess with it some more

-Dave

[zrpilot]

OK, that helps.

First the exhaust will GLOW if there is no air moving past it!

Second Bump that main up at least 1 maybe 2 sizes and raise the needle one notch until the weather warms up.

And a new #50 pilot would help as well.


Elevation - I just googled my town and its elevation. IMHO elevation where you and I live does not have as big an influence as temperature does on jetting.

[flauge]

Originally posted by cincy250R
well i was in my garage and just noticed that they were glowing but it was idling for like 10 min as i was trying to adjust the pilot screw but how do you find your elavation(spelling) and it's about 25-30 degrees out....another problem is that i can't ride ether cause i don't have all my suspension back yet.... sooooo i guess i'll just have too mess with it some more

-Dave
Yep, get a 50 pilot and try around 2-3 turns. You just might need a 52 because of your temp.
Im on 175K and 50 pilot right now and below 50 degrees mine starts popping on decel so yours might do the same b/c of where youre at.
Id get a 52 just in case.;)

[fast2007]

MXpimp wish you lived closer I have a nastly little 416,,but We have a piped yfz450 and No 400ex without a lot of work will out run it..Period!!We can maybe hook them up when we come up to W.V. in March...Just for fun

PS Im putting a 450r carb on now ,but with my slip on and stock carb I out ran some 450's on bottom and topend,butnot that yfz..LOL

[fast2007]

Now my probs...Just put it on and im at sealevel..NC Anyways it pops back bad at idle on deceliration..(Reving) It has a 52 pilot and 178 main,but revs good...Ver little hesitation at all and that was with nothing hooked to the carb...

[fast2007]

450 carbs ion ,but I lost alot of bottomend (Dont wheelie like it did)and it seems to pull alittle better up top..I had a 200main in my stock carb and no hesitation or nothing pulled hard everywhere..Any idea's is the main to small ,considered I got a 178main in 450r carb and 52 pilot??I pops back bad off excelleration..real bad,maybe to lean??Info would be nice..

[zrpilot]

Originally posted by fast2007
Now my probs...Just put it on and im at sealevel..NC Anyways it pops back bad at idle on deceliration..(Reving) It has a 52 pilot and 178 main,but revs good...Ver little hesitation at all and that was with nothing hooked to the carb...

When you say, nothing hooked to the carb, what do you mean? Is there and airfilter on it? If not, that will make the whole jetting thing funky!

What other mods do you have? Where is the needle set at? I have a 416, ported, HRC cam, SParks exhaust, and I'm running a 175 main with a 50 pilot and it is VERY close to spot on at 70F!

[Ruby Soho]

k guys i got an 04 450r carb.

what would you guys think would be a good estimate for my mods?

11:1 440
hotcams stage 3 cam
white bros mx4 slipon
uni filter

[zrpilot]

Originally posted by Ruby Soho
k guys i got an 04 450r carb.

what would you guys think would be a good estimate for my mods?

11:1 440
hotcams stage 3 cam
white bros mx4 slipon
uni filter

50 pilot
180-185 main
needle on th 4th notch

[fast2007]

Carb right or wrong??It pops back bad on deceleration..I weigh 190lbs and I ran today at farmington dragway in NC..It has full nobbies and a 416(11.1),my head..(It works)stage 2 cam ,slip on jardine,16 tooth and 450carb which probably is to lean..Anyways I am at stock height and I wheelied real bad ,but still ran a 9.10@72.58 mph..(With that much Mph it will run 8.60-8.70)what ya think??Oh yea that asphalt track..Need more fuel??Its forsale $2200 Imagine if it had a full system...:eek2:

[madmark tc440ex]

need some suggestions from ones with a similar set up.

TC racing 440 bore 11:1
TC pro cam (biggest he makes)
TC exhaust (supertrap without discs, tip on end)
TC port and polish
TC lightened flywheel

live in KY and ride in temps from 60 to 100

Thanks for the help!

[r-exrider0003]

zrpilot
do you think you could help me.
im running a 11:1 prox piston, bored to 426, ported, hotcam stage II, white brthers promeg full syst.
i recently got it all back together with the new carb.
im not sure on needle pos, air fuel screw, or pilot, just that i have a 170 dyno jet in.
what do you think i should change to, its running reallly rich.

[zrpilot]

We need to determine some things:

1) what pilot is in it?
2) More then likely it is a Dynojet needle?

I can only help using Kiehen jets, as don't know the Dynojet system. Sorry.

[r-exrider0003]

well i was planning on getting away from dyno jets anyways, and was going to get some regular one maro. what size do you think i should start with?

[zrpilot]

Originally posted by r-exrider0003
well i was planning on getting away from dyno jets anyways, and was going to get some regular one maro. what size do you think i should start with?

I'd get a 50, and 52 pilot. A Stock needle. 170, 175, 180, 185 mains.

I'd start with the 50 pilot, the 180 main and the needle on the 4th from the top.

[fast2007]

Myne runs good ,but on decelleration it pops back bad!!!!To lean maybe..When its cold it spits back threw the carb..52 pilot/178 main..What ya think??I just enjoy killing 450's with pipe etc..(Mild work):)

[zrpilot]

Originally posted by fast2007
Myne runs good ,but on decelleration it pops back bad!!!!To lean maybe..When its cold it spits back threw the carb..52 pilot/178 main..What ya think??I just enjoy killing 450's with pipe etc..(Mild work):)

A 52 pilot should be OK, have you backed your fuel air mixture screw out a couple of turns?

[fast2007]

Yea its like 3-3.5 turns..To lean to on the back firing on decel?

[zrpilot]

3-3.5 turns is to many.

1) check for intake and ot exhaust leaks
2) get a 55 or 58 pilot and re-adjust the fuel screw.

[r-exrider0003]

okay. so last night i put in stock needle, on the fourth clip down from the top, put in a 170 main, turned air fuel out 2.25, and didn mess with pilot
it is still running terrible.
like with the choke on itll idle up like a 450 and run alright, and i eventually got it to idle like normal with choke on if i put my finger over the hot start hole. Also, what should i do to close this hole up? or leave it open?anyways, it wont run good at all with the choke off, it wont idle, and if i try to give it gas it spits and sputters and backfires. thanks alot for all the help zrpilot. im going to order i pilot today, you think a 50 or 52 will do?

[zrpilot]

Originally posted by r-exrider0003
okay. so last night i put in stock needle, on the fourth clip down from the top, put in a 170 main, turned air fuel out 2.25, and didn mess with pilot
it is still running terrible.
like with the choke on itll idle up like a 450 and run alright, and i eventually got it to idle like normal with choke on if i put my finger over the hot start hole. Also, what should i do to close this hole up? or leave it open?anyways, it wont run good at all with the choke off, it wont idle, and if i try to give it gas it spits and sputters and backfires. thanks alot for all the help zrpilot. im going to order i pilot today, you think a 50 or 52 will do?
When you installed this did the hot start hole get plugged?
Is there a spring holding the plunger down inside the hot start mechanism?

Please refer to my installation notes for pictures and answers.
My 450R installation (http://www.exriders.com/vbb/showthread.php?s=&threadid=314423)

I would get a 52 pilot....

[r-exrider0003]

no it's totally open.
i didnt know you had to plug it?
could you go into more detail on how you pluged yours?
i need a hotstart cable as well?

[zrpilot]

Originally posted by r-exrider0003
no it's totally open.
i didnt know you had to plug it?
could you go into more detail on how you pluged yours?
i need a hotstart cable as well?
See the previous post for a hot link to some instructions.

[r-exrider0003]

yea i read that about 3 times, and still dont totally understand how you did it.

[zrpilot]

Originally posted by r-exrider0003
yea i read that about 3 times, and still dont totally understand how you did it.

I took the black plastic cover that holds the spring and plunger in plcae and filled it full of RTV, then I allowed it to dry for a couple of days and then re-installed it with the spring and plunger in place.

[Wheelie]

My final jetting:

48 pilot--A/F screw out 2 1/4 turns, needle on 4th clip from top, and a 200k main. Works great from sea level to 2000ft.

Mods are in my sig.

Tried the 50 pilot, throttle response suffered. Throttle response with the 48 pilot is incredible.

[zrpilot]

Originally posted by Wheelie
My final jetting:

48 pilot--A/F screw out 2 1/4 turns, needle on 4th clip from top, and a 200k main. Works great from sea level to 2000ft.

Mods are in my sig.

Tried the 50 pilot, throttle response suffered. Throttle response with the 48 pilot is incredible.

Thanks for sharing!

Nice Job!!!

[r-exrider0003]

alright, ive got it mostly dialed in, itll run somewhat now. i found out that it didnt have a pilot jet at all, that explains why i couldnt find it hah. any ways now i have a 170 main in, a 50 pilot, fuel/air at 2.5 out, stock needle at middle positon. and i havent got the hotstart sealed bc my brother said he doesnt have his sealed on his 450 and it doesnt matter, and im not really sure how- i know youve explained it, but idk all the names of the carb piece's and i dont have a cable to hook up. did you get that black plastic type thing from like a hardware store, or is it what the factory hot start looks like? but running wise, it will idle kinda, but it holds rev's and sometime idles up on its own. choppy, and backfires a little... this is all in neutral, bc i have yet to actually ride it yet. thanks again .

[zrpilot]

Originally posted by r-exrider0003
alright, ive got it mostly dialed in, itll run somewhat now. i found out that it didnt have a pilot jet at all, that explains why i couldnt find it hah. any ways now i have a 170 main in, a 50 pilot, fuel/air at 2.5 out, stock needle at middle positon. and i havent got the hotstart sealed bc my brother said he doesnt have his sealed on his 450 and it doesnt matter, and im not really sure how- i know youve explained it, but idk all the names of the carb piece's and i dont have a cable to hook up. did you get that black plastic type thing from like a hardware store, or is it what the factory hot start looks like? but running wise, it will idle kinda, but it holds rev's and sometime idles up on its own. choppy, and backfires a little... this is all in neutral, bc i have yet to actually ride it yet. thanks again .

The hot start is in an important device. Inside there is a plunger with a spring. The black cover that I depict in my picture is not the important part, the spring and plunger are!!! If yours has the spring and plunger held in place by another means, thats OK. But its gotta be there!

Zrpilot

[r-exrider0003]

so i finally got my hotstart in. man, im sorry forall the confusion. i now realize how important this is. and turns out my brother had the plunger only in his, and didnt notice nothing sticking out and thought it was empty. anyways, this thing is running off, but man the difference is amazing. its gotta lot more torque and pep, well this is also now running a ported head so that helps too hah. anyways im running a 170 main jet, a 48 pilot, needle on one up from the middle(towards the lean side) and my air fuel screw is about 1.75 out. to get it to start, i need to pump the throttle a bit, then choke on, but itll idle well once primed. its gotta lot of giddy up from about 1/5th to 3/5th then it kinda flat line's and sounds alot like im hitting the rev limmiter (a gargoling type noise), i had a 185 main, and it ran worse with more rev limiter sounds thruout the throttle. so i was wondering what you think i should do, what size main jet? it seems like it needs to be leand out a bit, but sounds kinda crazy when i see some guys on here running 210 mains.? :confused: btw im at low elevation, around 500-1000 id say, and its somewhat cold out. thanks zrpilot, sorry for all the trouble.

[zrpilot]

Originally posted by r-exrider0003
so i finally got my hotstart in. man, im sorry forall the confusion. i now realize how important this is. and turns out my brother had the plunger only in his, and didnt notice nothing sticking out and thought it was empty. anyways, this thing is running off, but man the difference is amazing. its gotta lot more torque and pep, well this is also now running a ported head so that helps too hah. anyways im running a 170 main jet, a 48 pilot, needle on one up from the middle(towards the lean side) and my air fuel screw is about 1.75 out. to get it to start, i need to pump the throttle a bit, then choke on, but itll idle well once primed. its gotta lot of giddy up from about 1/5th to 3/5th then it kinda flat line's and sounds alot like im hitting the rev limmiter (a gargoling type noise), i had a 185 main, and it ran worse with more rev limiter sounds thruout the throttle. so i was wondering what you think i should do, what size main jet? it seems like it needs to be leand out a bit, but sounds kinda crazy when i see some guys on here running 210 mains.? :confused: btw im at low elevation, around 500-1000 id say, and its somewhat cold out. thanks zrpilot, sorry for all the trouble.

Before we change the main, I'd lower the clip on the needle. (in other words, raise the needle!). Try the 4th notch from the top.

[r-exrider0003]

wouldnt this richen it? the oppisite of what i thought it needed? :confused: you refer to the top of the needle as the bolder end correct? ill try it tomorow after schoool, and report back with results.

[REDRIDER312]

Just installed my 450r carb....now i need help jetting......Mods are a yoshi slip-on,rev box, open aluminum air box w/ foam filter
Where should i go with the jetting ??

ANY INPUT WOULD BE GREAT !!!!!

[400exmatt]

i have a 400 that is bored to a 440 11.1 , lrd pro series, aluminum airbox, uni filter, I got a 450r carb on the way and was wondering where would be a good place to start at.. thanks.

[phat1478]

i have a 406 with 11:1, ported, stage 2 hotcam, e series slip on, k&n, and a rev box. ready to install 450 carb what jets should i run?

[400exmatt]

Can anyone help me find a part # for the hotstart spring and plunger. i really need this. thanks

[zrpilot]

Originally posted by 400exmatt
Can anyone help me find a part # for the hotstart spring and plunger. i really need this. thanks


I think this is the part number.

16019-HP1-671 VALVE SET $21.51

[BIGKURT666]

ive got a 450r carb and cable for 75 bucks no less pm me if interested

[bob gnarl]

First and foremost i want to say thanks 2 everyone 4 posting all the hot tips! i just got my carb dialed in! I have CT Racing 416: ported&polished, stage2 cam, ct full race exhaust and wiseco 11:1 piston, running 60/40 mix. The setup im running on this carb is a 195 main,air/fuel screw out 3 1/2 to 4 turns out. ( I fiddled with it quite a bit) so i cant remember exactly and i set the needle second up from the bottom( richer end) but like i said i had to think of my fuel situation as well! I might end up bumping up 1 more jet 4 sh*ts and giggles!
:cool:

[exrid3r400]

im rebuilding my 440ex it has yoshimura exhaust kibblewhite vavle wit kibblewhite springs hotcams stage 2 im puttin on the 450r carb idk what i should run for jets my elavation is 1000ft

[1965 honda]

i just bought a 450 carb off ebay all the jets were gone. so im not sure were the the pilot jet gos or im just missunderstanding what to do

[zrpilot]

Originally posted by 1965 honda
i just bought a 450 carb off ebay all the jets were gone. so im not sure were the the pilot jet gos or im just missunderstanding what to do

OK lets start by seeing if there is a needle jet? Should be a thin brass color "needle" in the middle of the carb slide. Note you may have to move the slide up to see it.

Next, I take it you have pulled the float bowl off? The main should be directly inline with the needle. The pilot should be right next to the main and is brass colored with a straight slot in it for a screw driver to fit into.

Post some pictures if you can..

[1965 honda]

ok i had no needle jet or main jet i have a pilot jet assuming stock.
i bought a dyno jet kit and installed the needle jet they supply, im not sure if its bigger than the stock needle but i have it on the very top notch (leanest)the main is a 112, pilot screw out 1.5 turns
and im still puffin black smoke. my sparkplug is black and i just cant get it to stop puffin. im not sure what the problem is but its driving me nuts because im seeing that everyone else is running a much larger main jet, needle in the middle and larger pilot or at least opened up more. please help:ermm:

[zrpilot]

Originally posted by 1965 honda
ok i had no needle jet or main jet i have a pilot jet assuming stock.
i bought a dyno jet kit and installed the needle jet they supply, im not sure if its bigger than the stock needle but i have it on the very top notch (leanest)the main is a 112, pilot screw out 1.5 turns
and im still puffin black smoke. my sparkplug is black and i just cant get it to stop puffin. im not sure what the problem is but its driving me nuts because im seeing that everyone else is running a much larger main jet, needle in the middle and larger pilot or at least opened up more. please help:ermm:
Is the carb a round or flat slide? Is the hot start plugged correctly?

I'm not really familar with dynojet main sizing, but if you were running the stock Keihen jets I would recommend around a 170 main, needle on the 4th from the top, and a 50 pilot.

Really look at the hot start... this could be the problem!

Zrpilot.

[1965 honda]

the carb i bought was junk ive already replaced it with stock. im just gonna buy a new one from the dealer. I WILL NEVER BUY FROM EBAY AGAIN!!!!!!! or at least another carb anyway.:macho

[zrpilot]

Originally posted by 1965 honda
the carb i bought was junk ive already replaced it with stock. im just gonna buy a new one from the dealer. I WILL NEVER BUY FROM EBAY AGAIN!!!!!!! or at least another carb anyway.:macho
brand new from servicehonda.com they are like $170!!!!

Not a better deal to be had IMO!!!!

Don't give up the 450R carb is an inexpensive upgrade!

[HondaRaceReady]

It seems like everyone with this upgrade says it will stall if you rev it in neutral. Will it stall if you try to putt around in first? I know the top end power is great, but without low end, the bike will seem weaker.

[zrpilot]

Originally posted by HondaRaceReady
It seems like everyone with this upgrade says it will stall if you rev it in neutral. Will it stall if you try to putt around in first? I know the top end power is great, but without low end, the bike will seem weaker.

Mine does not do this!!!!

Most people say this is a GREAT upgrade!!!! I think if you did it to your 400EX, you would agree!

[Ruby Soho]

mine doesnt stall

it pulls like no tommorow low rpm's:p

[BigBore24]

if it stalls then its not jetted right. i just put my 12.5:1 piston back in and it started stalling like you are talking about. i lowered the clip on the needle to the 4th notch from the top and it took care of it. the carb should give you the same feel all the way throgh the throttle like the stock carb...only a lot better

[alex10]

What is the part num. to buy one from service honda?

[zrpilot]

Originally posted by alex10
What is the part num. to buy one from service honda?

Part number is 16100-HP1-673 They are $159 new from Service honda . com

Look at my how-to on my 450R installation

my 450R carb installation (http://www.exriders.com/vbb/showthread.php?s=&threadid=314423)

[honda729]

got my 450r carb now i need some jetting advice, 416 12.5:1, stage 2 hotcam, powerbomb header,uni filter, cobra slip on soon to be a hmf, im at about 800-1000 ft. thanks again

[zrpilot]

Originally posted by honda729
got my 450r carb now i need some jetting advice, 416 12.5:1, stage 2 hotcam, powerbomb header,uni filter, cobra slip on soon to be a hmf, im at about 800-1000 ft. thanks again

Start at a 180 main, needle on the 4th notch and a 50-52 pilot

EDIT: OOPS....

[bens250ex]

what brand jet has a R by the number?

[leasureryan]

lol....ZRPilot...you said 150 pilot......lol

okay...couple questions.

1. Do I need a 450R cable when installing the carb?
2. Can I install a hot start cable on my quad instead of blocking it off? Or is it worth it?
3. I am currently running a 172 main, 52 pilot....needle on 4th clip down, screw out 3 turns...quad couldn't run better. When installing the R carb...should I stick with the same size jets as current, or go bigger. I mean, the way I understand it is, more air = More fuel, so I should atleast go up a couple jet sizes, but maybe I am wrong. I mean...I can jet a bike pretty good, I even bring some home from work to do, since EPA won't allow them to pipe or jet there...lol. Just wondering what the transition will be? If worst comes to worst, I will just have it apart a couple 10 or 20 times....lol. That will most likely be how it goes down anyways...lol

I am a freak about my jetting....I can't just change it once, and ride around on it like that all day...I have to keep screwing with it until it is perfect. Sometimes it happens quickly, sometimes it doesn't....lol But I can't allow my quad to run like butt, with hesitations, and backfiring etc.

[zrpilot]

Originally posted by leasureryan
lol....ZRPilot...you said 150 pilot......lol

okay...couple questions.

1. Do I need a 450R cable when installing the carb?
2. Can I install a hot start cable on my quad instead of blocking it off? Or is it worth it?
3. I am currently running a 172 main, 52 pilot....needle on 4th clip down, screw out 3 turns...quad couldn't run better. When installing the R carb...should I stick with the same size jets as current, or go bigger. I mean, the way I understand it is, more air = More fuel, so I should atleast go up a couple jet sizes, but maybe I am wrong. I mean...I can jet a bike pretty good, I even bring some home from work to do, since EPA won't allow them to pipe or jet there...lol. Just wondering what the transition will be? If worst comes to worst, I will just have it apart a couple 10 or 20 times....lol. That will most likely be how it goes down anyways...lol

I am a freak about my jetting....I can't just change it once, and ride around on it like that all day...I have to keep screwing with it until it is perfect. Sometimes it happens quickly, sometimes it doesn't....lol But I can't allow my quad to run like butt, with hesitations, and backfiring etc.

answers:
1) yes
2)not needed, I'd block off
3)I'd try that jetting, should be close

[leasureryan]

I got the adapter I bought from you...great job! I still don't have the carb until later this week though....lol. ZRpilot is faster than Honda Direct!...lol

Question is....I like to try and keep things fairly intact, and try not to get to "race" with things....like removing the choke plate on my current carb for example. I never have to use it, but do ride in the winter, and may have to use it then, which is why I left it on.

Are most of you guys taking the choke out of the 450R carb, or leaving them in? If I do remove it...promise me I will never have problems getting it started...lol! If you think I will...I will leave it on.

Anyone ever use those air direction "Turbo" insert things that fit between the carb and boot(motor side)??? Do they work, or help at all?

[zrpilot]

Originally posted by leasureryan
I got the adapter I bought from you...great job! I still don't have the carb until later this week though....lol. ZRpilot is faster than Honda Direct!...lol

Question is....I like to try and keep things fairly intact, and try not to get to "race" with things....like removing the choke plate on my current carb for example. I never have to use it, but do ride in the winter, and may have to use it then, which is why I left it on.

Are most of you guys taking the choke out of the 450R carb, or leaving them in? If I do remove it...promise me I will never have problems getting it started...lol! If you think I will...I will leave it on.

Anyone ever use those air direction "Turbo" insert things that fit between the carb and boot(motor side)??? Do they work, or help at all?

Ryan,
Thanks for the compliment!

The 450R carb does not have a tradition choke butterfly like the stock carb does. Instead it has an enrichment circuit that simply provides additional fuel for cold starts. When you put the 450R carb on, you will see a yellow plastic handle that , unfortunately, will not work. However you can fab up your own to pull up on the enrichment circuit plunger, similar to the yellow handle. I did not need that. I simply stabbed the throttle a couple of times and then lit it off. Sometimes I had to do the same will cranking, but it always started.

Hope this helps!

[leasureryan]

hell yeah. Thats cool. On the parts fiche ....it showed the yellow lever....so I assumed it has a butterfly type choke. What is the lever for then? And will I have to trim it since I have your adapter?

[zrpilot]

Originally posted by leasureryan
hell yeah. Thats cool. On the parts fiche ....it showed the yellow lever....so I assumed it has a butterfly type choke. What is the lever for then? And will I have to trim it since I have your adapter?


trimming could work....

I did not use it at all because I primarily ride when the weather is not Nipple hardening...LOL

I eventually did fashion a suitable replacement from some welding wire so that I could aid the motor in starting as the weather got colder

[08trx400ex]

just got my 05 450r carb in the mail. where can i get a throttle cable? What is the stock jetting on this carb so I will know which direction to go? What are the 2 electrical wires coming out of this carb for? My 400ex carb did not have these and are they necessary?

[zrpilot]

Originally posted by 08trx400ex
just got my 05 450r carb in the mail. where can i get a throttle cable? What is the stock jetting on this carb so I will know which direction to go? What are the 2 electrical wires coming out of this carb for? My 400ex carb did not have these and are they necessary?
USe a 450R throttle cable
Main is a 148 and the pilot is 48...??? IIRC
Throttle position, cut them

[08trx400ex]

installed carb and awesome! need to rejet but no big deal. mr. zr, can i please get one of those adapters? think my original carb had a problem with the float or something.

[zrpilot]

Originally posted by 08trx400ex
installed carb and awesome! need to rejet but no big deal. mr. zr, can i please get one of those adapters? think my original carb had a problem with the float or something.

PM sent

[leasureryan]

okay....was everyones jetting lower than with the 400ex carb? I put in the exact same jets as what was in the 400 carb....seems really rich....got flames from the exhaust, poping back into the carb. Should I go back down in jets?

[zrpilot]

Originally posted by leasureryan
okay....was everyones jetting lower than with the 400ex carb? I put in the exact same jets as what was in the 400 carb....seems really rich....got flames from the exhaust, poping back into the carb. Should I go back down in jets?
What jets do you have in it now? Needle position? Pilot?

[leasureryan]

started with a 168 main....just like what is in the 400 carb.....then starte with a 45 pilot....same as 400 carb....ran like complete ***....lots of strong black fumes....long hot flames coming from pipe.........pulled the plug,,,,and it was imediately black. I droped the pilot down to a 42...and the main down to a 158....air screw 3 out needle 3rd clip.....bike idles fine....still has a heavy chug/cough in it though...and still shooting flames, poping back into the carb....the only thing I could compare it to in sound in one of the old john deer engines they use to make taffy...I think it's steam maybe...where they will turn over and turn over then "POP"....you here the little motor fire, or release pressure, or whatever they do...lol....that is the only thing I can compare it to...lol


I still think it's pretty rich. I don't understand why on a 450...they only have a 118 main....you would think that being a bigger motor, moving more air....that it would use way more fuel. I can jet pretty well.....but if it is truely that rich...I am baffled

i have yet to figure that out aswell. Bigger engine, bigger carb with more airflow and smaller jets?

[zrpilot]

Originally posted by leasureryan
started with a 168 main....just like what is in the 400 carb.....then starte with a 45 pilot....same as 400 carb....ran like complete ***....lots of strong black fumes....long hot flames coming from pipe.........pulled the plug,,,,and it was imediately black. I droped the pilot down to a 42...and the main down to a 158....air screw 3 out needle 3rd clip.....bike idles fine....still has a heavy chug/cough in it though...and still shooting flames, poping back into the carb....the only thing I could compare it to in sound in one of the old john deer engines they use to make taffy...I think it's steam maybe...where they will turn over and turn over then "POP"....you here the little motor fire, or release pressure, or whatever they do...lol....that is the only thing I can compare it to...lol


I still think it's pretty rich. I don't understand why on a 450...they only have a 118 main....you would think that being a bigger motor, moving more air....that it would use way more fuel. I can jet pretty well.....but if it is truely that rich...I am baffled

Could it be that you are too lean? Try a 175 main, needle on the 4th notch and a 50 pilot... then adjust the fuel screw.

[leasureryan]

I went to replace my header gaskets this morning....broke a stud....spent 3 hours getting that out....luckily I work at a Honda dealer....so I can make my way right into the service dept. and toss it on a lift, so having the tools and supplies makes things so much easier...lol. BUT....when I pulled the pipe....it was super white inside. So I knew instantly that it was way lean.....got the studs in, and went home and tossed the bigger jets in. I started with a 180 main and a 48 pilot.......flames went away...as did all the poping....actually runs really good, but need alot more fine tuning. Has a hard stumble, and may still be a little lean


the one thing that is absolutely amazing is.......FINALLY, it CURED my decel backfire that I could NOT get tuned out of that 400 carb with this HMF full system. I tried EVERY jetting combo possible, and EVERY clip and screw setting...it just wasn't happening. Those pipes I think are made to move alot more air than a stocker can.

Anyways...I am back off to the garage to toss a bigger jet in it and see how it acts. Currently at a 180 main and 48 pilot....going to toss in a 185 and or 190...and maybe a 50 pilot.

Any comments or suggestions?

so it runs a lot stronger even just with exahust and intake mods? I've been debating this mod for awhile, everytime I take a few weeks off from riding I end up being bored from not riding and I have the urge to get my hands dirty with something so I tend to buy parts lol. I love working on my quad when its something to better it, i dont like replacing parts and stuff if they get damaged but just the radio on, fan on, rolling stool, a lot of soda, working on something... i love it.

[leasureryan]

I love it too.....the wife however has a differant theory!...lol


anyway....I hadn't even riden it yet....I just tossed the 190 main in it.....seemed to be running even better than the 180...so I knew it was still a little lean with the 180. Put the 190 in and,No hesitations, no bogging, no poping or backfire.....so I tossed the rear fender on, and straped the tank down....and went for a spin. I was just going to go up the dike and back.......but couldn't resist going the distance, 100 yards further into the trails......so off I went. All I can say is HOLY SHART! The instant throttle responce, so much more low end...it just keeps giving and giving. I can only imagine what it will provide once I get my other top end straped on!

we will see how this one reacts....it may still be a little lean....but it's damn close. All will be told next Wednesday when I head down to Mt Gilead to get it Dynoed. I want this thing running the perfect most powerful fuel mixture. Thats where the little exhaust sniffer comes into handy!


Thanks for all the help guys!