installed the 450R carb and WOW.....!!!

[mor300ex]

thank you so much for the reply and I will look for your 405R carb mini how-to thread . I'll certainl let you know if I have questions and hope they're not really stupid ones!!!
:p

[zrpilot]

Originally posted by mor300ex
thank you so much for the reply and I will look for your 405R carb mini how-to thread . I'll certainl let you know if I have questions and hope they're not really stupid ones!!!
:p

Check your PMs

[justin1022]

ok you guys!!! i have been wanting to do this mod for about a month:cool: and i was buying crap for my 400ex of ebay the other night i baught a 440 big bore kit pb block of kit heavy duty cam chain a new harness a hmf pipe and a few little other goodies then i decided to search a 450r carb and i found one for the buy it now price of 100$$$:eek2: so i baught it it came with the hot start throttle cable and even the throttle that mounts to your handle bars and fuel hose. i was thinking about it if it was a good deal and i figured out that it was because you guys are paying about 165 for one but now the real question is what would you guys start jetting at once i drop my pipe on and 440 kit i also have hot cams stage 2 and a k&n filter i dont really no were to start:confused: i havent even jetted a carb before the reason i baught a new one is because my old one a bunch of screws got striped and it was messed up.

[zrpilot]

180 main and the needle on the 4th notch and a 50 pilot. Start there and see how it runs. It is ABSOLUTLEY critcial that the hot start be completely sealed!

[justin1022]

Originally posted by zrpilot
180 main and the needle on the 4th notch and a 50 pilot. Start there and see how it runs. It is ABSOLUTLEY critcial that the hot start be completely sealed!

what if i just leave the hot start and moun it to the bars i no thre is not really a reason for it because its electric start but then it would be less of a hassle. could i just do that?

[hypersnyper6947]

was this a reg 450 carb or the fcr when the first guy got the WOW effect

[asohagan]

it was an fcr

[zrpilot]

Originally posted by hypersnyper6947
was this a reg 450 carb or the fcr when the first guy got the WOW effect

2004-2005 450R carb, just as the title of the thread says!!!!!!

[hypersnyper6947]

Originally posted by zrpilot
2004-2005 450R carb, just as the title of the thread says!!!!!!

The title doesn't say anything about year, and from what i hear there is a big difference between the 04-05 and the 06-08 FCR. Does anybody know if that difference is that significant

Thanks

[zrpilot]

Originally posted by hypersnyper6947
The title doesn't say anything about year, and from what i hear there is a big difference between the 04-05 and the 06-08 FCR. Does anybody know if that difference is that significant

Thanks

Check the date of the first post... 2005!

Anyhow there is a BIG difference between those years. I know of only one guy here running the '06 and newer carb. Fitting the '06 newer carb is more difficult and the carb is more expensive.

In summary use th '04-'05 carb!

[hypersnyper6947]

cool thanks, i didnt even think to look at the first post date. I think the 450 carb should be better than my lectron

[honda729]

my honda dealer just told me that doin this was dumb cuz the intake boot wouldnt possibly allow anymore air through to the carb. lol dumbasses anyway great mod i recommend it to anyone

[leasureryan]

here is the verdict......

I just installed a 450R carb.......it is an absofucenlutely AMAZING upgrade!

Enough said....

guess who's next for the 450r carb? now to decide how to hook it up. Can I use a 450r airboot and modify it to fit the 400ex air box or what?

[sc400ex_rider]

no just enlarge the stock one with a sanding flapper wheel. you need to do the intake to. also for fuel line just use 3/8 auto fuel line. put a sparkplug in one end to enlarge it to fit the very large 450r inlet. its a little big to the petcock but i used a hose clamp with no probs. you need to move the airbox up about 1/2" also.

if the airbox is moved up a 1/2" then do I make a steel bracket so it stills connects to the back or what?

[sc400ex_rider]

some people say to take the rear bolt out push it up(forward) then put the bolt back in with a big washer to hold it. i tried this but it came loose. so i got one of those small torches and melted the plastic rear airbox bracket a little and bent it back. then i melted the tab a little to make the tab flat again and it works great. you can barley tell its modded.

[trailrider894]

well then what about. making sure that your exhaust is big enough to handle to air output?? i have a e-series by white brother's. is that big enough??

[3or4HONDA]

should i close up my airbox with the 450 carb or will having it open be fine i will just need a bigger main? i have a k&n with outerwears so i dont use a lid.... just wondering

[zrpilot]

Originally posted by 3or4HONDA
should i close up my airbox with the 450 carb or will having it open be fine i will just need a bigger main? i have a k&n with outerwears so i dont use a lid.... just wondering

No, if you can leave the airbox open. Yes you will need a bigger main and a bigger pilot jet.

[dunatic]

Did you install the BIG arp head studs ? if not, youll be fitting the head gasket problem for ever.


Originally posted by QuadJunkies
well, so much for testing out my carb tomorrow.. I blew a head gasket while jetting.....It hasnt ran good during a race and had a weird noise, now we know what the other noise was..... :rolleyes: :mad: Im not sure if its due to a bad jug or the Gasket ect.... We may go back and just put my 426 back on...:( I was REALLY looking forward to trying the 440 too...:ermm:

[QuadJunkies]

Originally posted by dunatic
Did you install the BIG arp head studs ? if not, youll be fitting the head gasket problem for ever.

It has the bigger studs now and has oversized vavles .This topic was a long time ago and I ended up changing things shortly after that happened. My idea was to ride and race -NOT WRENCH. lol

The Duncan kit is all custom fit. I have never blown a gasket since I bought the PC4000,sop all is good .

[northwest Texas]

It's been a while (almost a year) since I checked in here but let me tell you guys what I just did that worked better reaming the boot to fit on the carb maybe with the exception being the adapter that zrpilot has manufactured.

Initially I used a dremel to enlarge the opening of the airbox boot and I made a little bracket that moved my airbox forward. I never did like the way it fit on the carb so I bought a new boot.

Compared to my old one, it was longer being that the rubber had shrunk with age (my EX is an '00) so I got some more of my length back. It was also much more pliable and easy to work with compared to my old one

Before installation, I found a can that was very close to the OD of the carb and I managed to work it into the boot (it was a 2 person job) and I let it set for a week or more. The other day, after several weeks more I set it in the sun and with it warm, it slipped right on the carb. It was a little snug but a far cry from my old one which was a nightmare trying to get on.

Now, as far as the hot start, I left it on and routed the cable up to my bars for the time being. It's out of the way and it's alittle bit of an eye sore but that's what I did.

Anyway, for all of you out there, I would highly recommend a new boot to have on hand. For $20, it' s worth the money and it's much more pliable and easy to work with and it really removed a lot of heacache.

As for the carb settings you guys run, I had to put a 52 pilot in because my fuel screw was turned out so far and I was still getting popping on decel.

Mine is a 426 bore with ported and polished head with a 10.8:1 IIRC piston

I forget exactly the turns on the screw and the main.

Anyways guys, that's what worked for me.

Kyle

[Gagt518]

I recently just picked up a 450r Carb. Now i half to pick up a jet kit. My question is should i get a 450 jet kit or a 400ex kit? Thanks

[QuadJunkies]

They both run the long Hex..that is on BOTH Carbs...
Stick with the STOCK 450 needle and you should be fine .

You dont need a jet kit.

[Gagt518]

Okay, well what about the main jet? Or even the pilot yet. The guy i bought the carb off said that he believes there is a 178 main and a 50 pilot jet in the 450r carb. Needle clip is on the 4th clip from the top. He told me the main jets from my 400ex will fit the 450r carb just fine, but the pilot jets are different. He is sending a 48 and a 52 pilot jets along with the carb. All i have done is a full exhaust and a K&N with airlid on. Should i buy more pilot jets to be on the safe side? If so where do i pick them up. How many jets are in a carb?

Sorry for the n00b questions!

[QuadJunkies]

Theres one pilot,one needle and one main.
I dont know if you will gain anything if you havent had any motor work done or not,it might even cause a little bit of jetting problems..
the MAINS are the same ,thats what I was referring to,but you will have to go with whats in the 450 Carb and jet accordingly.Pilots you rarely have to change out,especially if your quad is stock.
IF you need some help getting threw the whole thing, I can give you my phone number and Ill walk you threw it .Sometimes it easier to cover everything over the phone

[Gagt518]

Pm sent. :)

[QuadJunkies]

PM sent back .Will talk soon. :)

[450 eater]

ok so i have a 06 fcr 450r carb an i cant git the jeting right at all so i took it to my frend hes is a tec at honda an we try the 170m an the 50p but it was runing relly ruff poping thru the air box.. but running good on top end.so he put a biger p jet in it an he endnt up with a 65p and 170m with the a/f at 4 turns but he told me that it needs a bigger p jet..i dont think it dus. i think its too big anyways..my spark plug is relly black so i think its rich i tryed a 165m but still no beter.it want idle more then 45sec


~travis

[sc400ex_rider]

my fcr was doing the same thing the float was sticking. i got it off ebay, they said it was race ready. i sent it back and got a 04-05 450r carb for 1/3 the price. i put a 165 main in it and havent had a prob with it at all. those fcr carbs are hard to tune and prone to failure.

[2muchquad]

i just put my fcr on a couple days ago,man those things flat out rip imo.I had it on my 385ex so i kind had an idea on the jetting baseline.Fcr's are finicky carbs and they are sensitive to temp changes.I'll have to go leaner as the weather gets warmer but it makes my 400 run like a whole new bike,im not kiddin...its that good.Mine is a 39mm off a yz400f by the way.Tried the 37mm off a 250f first,it popped and didnt want to rev cleanly,i didnt feel like dialing it in because it was only 37mm anyway,never got around to trying a 450r carb though..

[trx400 rider]

ok how much more power would the 450 give u if u already have a jet kit in the 400 carb

[2muchquad]

not sure on the 450 carb but the fcr is night and day,its not even close.Its just so much more responsive compared to the 400ex carb,plus it really shines on the topend,thats a trademark of the fcr carb:) i have heard similar things about the 450r carb as well,either one is a upgrade,you owe it to yourself;)

[zrpilot]

Originally posted by trx400 rider
ok how much more power would the 450 give u if u already have a jet kit in the 400 carb

Buster024 did a nice review of the 450R carb on a completely stock motor.

IMO, the 450R carb upgrade is the most cost effective and easiest install of the carb upgrades available for the 400EX. Nothing wrong with the FCR, except for it is EXPENSIVE as compared to the 450R carb and is difficult to tune.

buster024 write-up (http://www.exriders.com/vbb/showthread.php?s=&threadid=359411&highlight=buster024)

[Zeb400EX]

just put a 450r carb on my ex and everything is going great. zrpilot's adapter makes it way easier. But now I have a problem with the carb pumping fuel. There is fuel in the bowl but when I pump the throttle there is no fuel spraying out. Anybody had this happen?

[Zeb400EX]

just put a 450r carb on my ex and everything is going great. zrpilot's adapter makes it way easier. But now I have a problem with the carb pumping fuel. There is fuel in the bowl but when I pump the throttle there is no fuel spraying out. Anybody had this happen?

[Zeb400EX]

figure it out. the fuel hose was kinked. had to shorten it. still have to dial in the jetting a little,but wow it got a lot more snap to it. even on my stock motor

[zrpilot]

Originally posted by Zeb400EX
figure it out. the fuel hose was kinked. had to shorten it. still have to dial in the jetting a little,but wow it got a lot more snap to it. even on my stock motor

Where did your jetting end up?

[Zeb400EX]

right now I got a 50 pilot and 175 main. It seemed like it might need to go leaner on the needle, but I really don't know cause we got ice and snow everywhere and its like 30 degrees. But still a big improvement for the motor being stock. I'll tell ya what I end up with when I have a chance to tune on it.

[Zeb400EX]

hey zrpilot. do you have to use your choke. I was going to cut my down so I could use it but it doesn't really seem like it even needs it. I started it sun. pretty easy without it.

[zrpilot]

Originally posted by Zeb400EX
hey zrpilot. do you have to use your choke. I was going to cut my down so I could use it but it doesn't really seem like it even needs it. I started it sun. pretty easy without it.

Nope I did not have to use my choke. Couple of stabs of the throttle and mine lit right off.

Good question though!

Later.

[walrusfarm]

Tool belt

[Zeb400EX]

today I changed the pilot jet from a 50 to 48 because with the 50 it was smelling really rich at idle. with the 48 the smell when away and now the throttle feels crisper off idle. still might change the 175 main down one. it run fine but it also like 15 degrees here so it might make little rich once the temps hotter.

[Fischer416]

yea i had a friend install one on his and it made a big big difference he said... he and i had about the same motors too so i am definately lookin into doin this soon!!!!

[Zeb400EX]

Originally posted by Fischer416
yea i had a friend install one on his and it made a big big difference he said... he and i had about the same motors too so i am definately lookin into doin this soon!!!!

yeah you should do it. its not hard to do at all. just read all everyone has posted on here about it and you'll be fine. besides the R carb is way easier to adjust than a fcr carb. and a whole lot cheaper. i got mine on ebay for 70 bucks. i got the rest of the stuff ( cable and fuel line etc.) on cheapcycleparts.com for really cheap too. i wouldn't buy a jet kit though. i just bought a few jets from my dealer.

[zrpilot]

Originally posted by Fischer416
yea i had a friend install one on his and it made a big big difference he said... he and i had about the same motors too so i am definately lookin into doin this soon!!!!

Here is some more info on my 450R carb installation.

Definitely a good upgrade.

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

[Which 450?]

I used zr pilots adapter, worked out real nice. The carb came with a 48 pilot, 183 k main, When I ran it it was lean on the bottom end, threw in a 52 pilot and went down to a 150 main. Considering my bike is all stock minus airbox lid mod and twin air air filter. The top end was waay lean so I went back to the 183 main, took it for a spin, holy cow I couldnt believe how much more power. 1st run through the trails I shifted into 2nd and hit the gas like I always do the front end come up and I smacked a tree, the bike flipped and I was tossed about 10 feet, lol. I took it for a spin wide open, it seems that in 4th and 5th I lost a little bit of throttle response, well maybe a half a second of delay in it, but once it comes in its all good. I will still be tuning though. I know its way out. The power increase is amazing.


I did run into a few problems. I used 1/2" fuel line, I cut the stock line after the nipple on the fuel tank and the new fuel line slipped right over, but the fuel line is in the way of the choke, but I dont think that will be an issue, (just a few pumps of the gas when shes cold) and also, I moved the one vacuum line from the top to the side. But the carb still hits the gas tank, it pushes it up so much that I had a hard time getting the gas tank cover on. It is actually hitting the plate on top of the carb. This is not a huge issue for me, just thought I would put it out there.

[Which 450?]

ALSO the throttle lever pull is MUCH easier!!!!!

[Zeb400EX]

There should be a gap in between your gas tank and the top of the carb. Heres a pic of mine.http://i44.photobucket.com/albums/f12/bez65/IMG_1274.jpghttp://i44.photobucket.com/albums/f12/bez65/IMG_1278.jpg

[Which 450?]

you have that gap because the screw for the breather is hitting the tank, I cut mine down almost flush before I plugged it.

[Zeb400EX]

yea I see what you mean. I didn't know U cut the vent down.

[fireems519]

any idea what size bolt to plug in where the hot start cable goes??

[zrpilot]

Originally posted by fireems519
any idea what size bolt to plug in where the hot start cable goes??

Refer to my install procedure with pictures. I did not use a bolt to plug the hot start. It is REAL important that the COMPLETE internals of the hot start stay in the carb for it to be sealed off properly.

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

[sc400ex_rider]

Originally posted by fireems519
any idea what size bolt to plug in where the hot start cable goes??

what i did was to tap the little hole on the engine side of the carb behind the throttle plate and inserted and loctighted a little allen wrench set screw to block off the port so absolutely no air could pass through it. this is very delicate work but most effective as i didnt have the hot start plunger. i then put a 1/4" or 3/8" vacuum line cap in the plunger hole to keep the dirt out. some people would just fill it with silicon but if any air bleeds past it will cause hi idle even with the idle screw backed all the way out.

i think this pick is posted in here somewhere. i also cut the top vent line flush and plugged it with a allen set screw. http://i140.photobucket.com/albums/r20/starcraftier1/carblabeled.jpg

[fireems519]

so basically the easiest thing to do is to find a hot start cable and just instal it, cut off the part i dont need?

[sc400ex_rider]

yes if that is easiest for you. you need the hotstart plunger, spring and cap for sure. you can try the vacuum cap with silicon trick if you want just make sure it sealed off well or look up the carb on the micro fiche. i will try to find a link.

here its #8 its $18 at yamaha of troy
this is for an 05 450r (VALVE SET 16019-HP1-671)
http://i140.photobucket.com/albums/r20/starcraftier1/2882_CARBURETOR.gif

[monkeyballs]

Ok would a 450 carb actualy make a big diff on this. 400ex 2002 stock boar hot cam stg 1 and 11:1 wiseco piston light weight, yosh full system pipe, with k&n air filters with pre charger?
My budy wants 2 sell me his 450r carb and idk if I should even bother being that my ex is stock boar. ty

[zrpilot]

Originally posted by monkeyballs
Ok would a 450 carb actualy make a big diff on this. 400ex 2002 stock boar hot cam stg 1 and 11:1 wiseco piston light weight, yosh full system pipe, with k&n air filters with pre charger?
My budy wants 2 sell me his 450r carb and idk if I should even bother being that my ex is stock boar. ty

Simple answer, YES!

[monkeyballs]

But worth 100$? and ty lol

[Which 450?]

my bike is stock with air box lid mod and twin air air filter, it made a noticeable difference

[zrpilot]

Originally posted by Which 450?
my bike is stock with air box lid mod and twin air air filter, it made a noticeable difference

That is the great thing about this upgrade. It will work on a bone stock motor and grow with the motor, in other words if you continue to modify the motor the carb stays!!!

[Which 450?]

also cheap, I got mine for $75 shipped. This will probably be the most hp per dollar gain out of everything I have and will do.

[iownatoyota]

in the middle of a frame paint job, so i figured id do some mods to my 03 400 at this time, my buddy is selling me his front shocks and carb of his 05 450r for $150 so i cant wait to get them installed and try it out,

ZRpilot, do u have any more of those adaptors? heard they make the job easier, pm me if you do, thanks.

[Which 450?]

zr pilots adapters are the way to go.

[zrpilot]

Originally posted by Which 450?
zr pilots adapters are the way to go.

Thanks. Glad it helped!

[zrpilot]

Originally posted by iownatoyota
in the middle of a frame paint job, so i figured id do some mods to my 03 400 at this time, my buddy is selling me his front shocks and carb of his 05 450r for $150 so i cant wait to get them installed and try it out,

ZRpilot, do u have any more of those adaptors? heard they make the job easier, pm me if you do, thanks.
Yes I do. PM sent.

[BigLuke]

I got mine on saturday runs way to lean gotta get some new jets. Also need that adapter as soon as I get a paypal account.

[BigLuke]

I got mine on saturday runs way to lean gotta get some new jets. Also need that adapter as soon as I get a paypal account.

[3or4HONDA]

got to ride with the new carb today and WOW! the response is amazing, and just want to keep feeding....i think jetting is pretty close only pops a little on hard decel so i will check the plug next time i ride since i forgot to this time. should be all set tho. great mod.

[zrpilot]

Originally posted by BigLuke
I got mine on saturday runs way to lean gotta get some new jets. Also need that adapter as soon as I get a paypal account.

I just got another run of adapters made anticipating the upcoming riding season.

BigLuke, you can send a USPS money order if you want. PM me for address.

[Young_Gun1]

Is there any actual power diference numbers that ppl know?
and wondering if this or the sparks key would be a better mod?
currents mods in my sig

[zrpilot]

Originally posted by Young_Gun1
Is there any actual power diference numbers that ppl know?
and wondering if this or the sparks key would be a better mod?
currents mods in my sig

I don't have any dyno runs before and after my 450R carb install, but my opinion is that the carb would make a bigger difference overall then the sparks key.

Do you have a cam? If so then the 450R carb is the BEST way to go.

[Young_Gun1]

no I don't have a cam
I think i'll look in to this it seems like its pretty simple and doesn't require opening the engine like so many mods do

[pods_BMOC]

I would like an adapter Zr, also i read all 6 pages of your threat from last fall,.. just now,.. I do not have a tap for the hose re-configuring can i just block off the carb where the hose connects into and be done? Or is it much better to have the hose connected?

[sc400ex_rider]

ya just cut the top vent line nipple off flush so it dont rub through the tank. then you can seal it with a little silicon. you have to then drill out the side vent nipple cause its sealed. then just put a little hose on it and your done.

[zrpilot]

Originally posted by pods_BMOC
I would like an adapter Zr, also i read all 6 pages of your threat from last fall,.. just now,.. I do not have a tap for the hose re-configuring can i just block off the carb where the hose connects into and be done? Or is it much better to have the hose connected?

It is best to try to re-locate the vent. If you can't, then leave the vent hose in place and try to prevent it from becoming pinched.

I sent you a PM regarding adapters, I do have some available.

It is a great upgrade.

Zrpilot

[Zeb400EX]

figured out some thing today. If you leave the yellow choke lever on it will rub a whole in the fuel hose. I am taking it off cause I don't even need it anyways. Also I am running a 175 main and 48 pilot on my stock motor and I didn't run an airbox lid with my stock ex carb, so I left it off with the R carb but thats when it was like 30 degrees out. Now that its warmer (60s to 70s) it started hesitating when you blip the gas real hard. So I put the lid back on and now its got awesome throttle response.

[shok47]

Alright, Im interested in this mod and I want to make a checklist of the things that need to be done.

1. The boot from engine to carb has to grounded down to fit the bigger car hole?

2. Seal the hotstart hole. cut and Cap the top vent hole and drill out the side vent.

3. Airbox boot to the carb: do the hole sizes match or do I need to grind down the inside of the boot? Or is it just that it doesnt reach the carb? (have to move the box up 1 inch)

4. THen get jets? I have yoshi full exhaust, k&n filter I live in MA

[Zeb400EX]

I just ground a little off the carb. to get it to fit into the engine to carb. boot. Some guys say that it easier to get the boot over the carb. if you buy a new boot because the rubber is more pliable, I just used my old one. As for the airbox boot you'll have to grind the boot to fit onto the carb. or ask zrpilot on here if he has any more adapters. I use the adapter and it worked great plus you can use the factory mount for the airbox. You just have to grind off the rib on the airbox side of the carb. then the adapter will side over the carb. I used some gasket silicone to seal the adapter to the carb. As for jets. Start big(like 180) and work your way down. How big of jet are you using now? I had a 170 stock and now with the R carb I'm using a 175. On the pilot jet I had a 42 stock. Now I have a 48. And 3rd clip down on the needle. I live in southern IN so it might be different where you are.

[uchi]

i followed this thread for the first 10 pages when it started and i lost track of it and forgot all about it. i know theres some great info in here and i plan on putting my 450r carb on next week. how can i tell if the bikes running too lean or too rich when i swap carbs? also im reading that you guys are doing something with the needle, last post says 3rd clip on the needle, can you guys be a bit more specific for this as ill be doing everything myself. and will i be fine to start off with the stock 450r jets for now? i bought my 400 already modded, pipe filter and im sure a jet kit as it runs pretty good at all speeds in any gear. so if it is jetted how can i tell what jets are in it and are they interchangeable with the 450r carb? im sorry im asking so many question but im sure if i start to read all 26 pages ill fall into a trance and wake up on the floor in the morning, lol.

perhaps we can have someone compile all the information into one post so that people who search this stuff out can get all the information hey may need from one post and not have to search through 26 pages.

keep up the good work guys, i cant wait to get this done:D

[uchi]

one mroe thing to add. the carb i picked up is complete with everything from the donor bike. comes with the hot start and everything. i suppose theres no downside to keeping the hot start in tact and just attaching it to something? an whats he purpose of this thing? just for starting the quad when its hot?

[2muchquad]

yes the hot start leans the circuit out for restarting..some bikes need it more than others,my mx bike will usually restart without it,my yz426 almost always needs it,just depends,may not need it on the 400ex

[n811]

I just left the hot start cable on mine. I tucked it back under the seat with zip ties and have even used it on a hot day. Dont fret about the air boot cutting it is easier than you think once you get started. I had this installed in less than an hour. But i did have to get a new pilot screw (larger) But I have my head ported.

[racer 557]

which is better on the 400 stock 450r carb or edelbrook 450r carb

[racer 557]

can someone do like step on how to do this mod because i dont get what u all mean when you say cut this cap this off and all that

[zrpilot]

Originally posted by racer 557
can someone do like step on how to do this mod because i dont get what u all mean when you say cut this cap this off and all that

Here is a write up I did quite some time ago when I put a 450R carb on my 400EX

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

As far as the edlebrock vs. the 450R carb, I think it comes down to economics and popularity. The 450R carb is much cheaper ($170 NEW from www.servicehonda.com) and MANY people have done this mod and there is a WEALTH of knowledge here.

Nothing wrong with the edelbrock....

[racer 557]

when i looked on that site it was like 300 and something i think

[riderssb250x]

my jeting is all screwewd up and i think its partly to due with the hotstart not being blocked rigtht..

i have a bolt on the hole with gasket sealer around it?
i have heard of filling the whole up with rtv all the way to the bottom?

what have you guys done and hows it holding up i may just get the whole setup for tthe hotatrt to be on the safe side unless theres an eiser way

[zrpilot]

Originally posted by riderssb250x
my jeting is all screwewd up and i think its partly to due with the hotstart not being blocked rigtht..

i have a bolt on the hole with gasket sealer around it?
i have heard of filling the whole up with rtv all the way to the bottom?

what have you guys done and hows it holding up i may just get the whole setup for tthe hotatrt to be on the safe side unless theres an eiser way

I cannot stress this enough to EVERYONE doing a 450R carb upgrade...

PLEASE follow my recommendation on how to plug the hot start, and make sure that the COMPLETE hot start plunger assembly is intact!!!!

ANY JETTING RECCOMENDS ARE NOT GONNA WORK UNLESS THE HOT START IS PROPOERLY SEALED!

[zrpilot]

Originally posted by riderssb250x
my jeting is all screwewd up and i think its partly to due with the hotstart not being blocked rigtht..

i have a bolt on the hole with gasket sealer around it?
i have heard of filling the whole up with rtv all the way to the bottom?

what have you guys done and hows it holding up i may just get the whole setup for tthe hotatrt to be on the safe side unless theres an eiser way

PLEASE READ THIS ALL THE WAY THROUGH!!!

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

[honda400-4-ever]

what mods did u have to do to make the 450r carb work?? what cables and lines did u have to get with the carb when you buy it??

[zrpilot]

Originally posted by honda400-4-ever
what mods did u have to do to make the 450r carb work?? what cables and lines did u have to get with the carb when you buy it??
The 450R carb will work on a bone stock motor and a highly modded motor.

Use the 450R throttle cable and 450R fuel line.

[honda400-4-ever]

not that kind of mod. mods like modifications to the carb itself.

[Which 450?]

Originally posted by honda400-4-ever
not that kind of mod. mods like modifications to the carb itself.

"Use the 450R throttle cable and 450R fuel line."

and the zrpilots adapter will make your life alot easier... and its only a few bucks.

[flyboy1294]

Hey guys, glad to be part of the forums...

Alrighty so I have just spent the past 3 hours reading ever last post in this thread, and all the posts in zrpilot's thread about the 450r carb. And I apologize for resurrecting the thread. I feel pretty educated on the topic. But just to be sure let me put this in bullet form...

Things needed

1.) 04' 450r Carb, check
2.) 450r stock throttle cable, check
3.) adapter like the one zrpilot made,
4.) 450r fuel like, check.

Issues to overcome

1.) 1" gap and mm difference between tube and carb, solved by adapter
2.) Top 'overflow spout' need to be ground down and plugged, Side needs to be used.
3.) Choke clearance issues, solved by engineering new choke lever
4.) Hot start hole needs to be plugged correctly.

That's all that I remember for the moment.

And I have a VERY stupid question, What is a hot start? I'm sure I know what it is, I just have never heard of it called by that name.

Thank you very much

[shaungray89]

I know putting a 400ex carb on a 300ex is a good upgrade will the 450r carb be an even better upgrade or will it not fit.

[Grizzy]

Need help, just installed 450r carb on 416ex. Runs awesome, idles, revs up well but after aobut thirty seconds of riding it will cut and just die like it is running out of gas. Start it back up run it for a little another couple passes and the same thing happens.

fuel line is not kinked, had anyone had trouble with the float? any other thoughts would help.

does any one have a link to the OE plunger to make sure i have the right set up on the hot start.

[sean.miller10]

just wondering where you got the carb and how much was it.

[zrpilot]

Originally posted by sean.miller10
just wondering where you got the carb and
how much was it.

If it were me I would go to www.servicehonda.com and get a new one for $175 bucks.

my $.02

[Kentang4]

I've been reading a lot of post but I haven't seen the question of year addressed, sorry if I missed it...

Can someone tell me if using the newer slide versions of 450r carbs works as well as the older butterfly models? I have seen mention of a throttle position sensor on the newer carbs as well, is this an issue when putting it on a 400 or can you just cap off the wires and not worry about them?

Thanks for your help.

kent

[fireems519]

there were 2 wires cut on my carb, i would imagine thats prob what there were for..never did get it installed, having trouble with the slide getting stuck..?? any ideas, cant even get the needle in

[zrpilot]

Originally posted by Kentang4
I've been reading a lot of post but I haven't seen the question of year addressed, sorry if I missed it...

Can someone tell me if using the newer slide versions of 450r carbs works as well as the older butterfly models? I have seen mention of a throttle position sensor on the newer carbs as well, is this an issue when putting it on a 400 or can you just cap off the wires and not worry about them?

Thanks for your help.

kent

The older versions (2004 and 2005) are the best ones to use. The newer (2006 and newer) might work but not as well, IMO.

Yeah just cut the wires from the TPS.

[Kentang4]

Thanks for the quick replies. Any chance you still have an adapter laying around for sale? My hunt for a 04-05 carb is on. I'm working on a total rebuild, Hot Rod crank, 416 11:1, and I think a stage 1 cam, I like torque...

[zrpilot]

Originally posted by Kentang4
Thanks for the quick replies. Any chance you still have an adapter laying around for sale? My hunt for a 04-05 carb is on. I'm working on a total rebuild, Hot Rod crank, 416 11:1, and I think a stage 1 cam, I like torque... PM sent

[redneck24]

those adapters look great i would like one if you have anymore thanks for all the info if you dont know how to install a 450 carb after reading these pages your in trouble

[Mr-Sleeper-34]

Is it better to run the 450r throttle cable, or will the 400ex do the job? I've read both answers.

[Zeb400EX]

Idk about using the stock ex cable. I'm sure someone has, but it just easier to use the 450r cable.

[mad4106]

Wow this carb really woke up my bike accelaration and throttle responese is nice!

[440rdr1]

I installed a 04/05 450r carb w/ adapter already installed on last week WITH the 450r cable.... take my advise

1) take your dremel either with a xmas tree bit OR a sanding drum and open up your intake boot (theres a lip which will prevent you from fully mating the 2)

2) install 450r carb cable ( the 400ex has a bend/curve at the carb which wont allow a clean install)

3) apply a thin coating of lithium grease just to ensure a easy install

4) you need to keep and use the stock 450r fuel line bc it has a step up in size (1/4 to 3/8?) - cut the final bend out of the petcock end of the hose and it will line up PERFECT with your petcock


im sorry i dont have any pictures, one day i will disassemble and take some shots

[Lquad71]

I have an 05 trx450r carb for sale if anyone is interested. 120+shipping