carbo pics and some questions please help

[jake"08"400]

Ok this is what I need to know will the fuel air screw off a 04 trx400ex fit a 08 with those new d shaped heads (that make no sense why honda did that) also does anybody have like a assembly are blue print of a trx400ex carb that shows all the parts inside the carb so I can see how to put it back together any help would really help me cos I gota f/a screw off a 04 trx400 and a needle (its adjustable that's why I wana put it in) and I need to know how to put it all in thanks anybody that can help..................

[rubbersdown]

not sur eon the air screw fitment but you can go on motosport.com or bikebandit.com to look an exploded view of your carb.

[jake"08"400]

Yea I saw the one on motosport I was hopen maybe somebody had a picture that wasn't so choppy looking...I guess I'll just take out the f/a screw and hope for the best lol

[jake"08"400]

Ok well the old f/a screws will fit the newer carbs with the d shaped one (if y'all was wondering) but I gota a new problem if someone will help....I got it 2.5 turns out and I gota 42 pilot air box is stock with lid and about 6 uni filter elements.....when its setting at a idle and I give it full throttle it dies I haven't got a chance to ride it to see if maybe putting a load on it will help but any suggestions is it to rich are lean...also my mods in in the sig.

[honda400ex2003]

lean will get my vote. adjusting your f/a isnt going to make enough difference to get it rich enough. tune the f/a first though and see how close you can get it. steve

[honda400ex2003]

did it run fine before you swapped it? steve

[jake"08"400]

How lean could it be really tho I mean unless I need a 158 main but the pilot is 42 and the f/a screw is 2.5 out

[jake"08"400]

Yea it did but that was before it got cold lol plus I added that hmf exhaust since the last time we spoke....but I put a bigger main to make up for it

[honda400ex2003]

i would probably say that with the current setup you would be looking at a 158 for the winter months. go 3 turns out on the f/a also for the cold and you should be fine.

steve

[jake"08"400]

Alrite man I'll try it thanks. Did you see my pics of it I posted ?

[honda400ex2003]

i havent found them yet on this thread. ill look around a bit. steve

[jake"08"400]

Ok its under my 08 pics are something

[pepshocks]

yes, if anyone has pics of the 400 carb inside that would be helpful. where is the f/a screw? and a pic of pilot jet. for some reason i keep fouling my plug strying to get this cold blooded 400 started

[jake"08"400]

The fuel air screw is on the bottom of the carb its going to be recessed in the carb a lil depending on your year it mite look like a D are itl be a flat head if its older than a 05 I belive.....the pilot jet is inside the bowl of the carb its also recessed in the carb its also a flat head screw itl be under a lil plastic piece that sticks up when you pull the bowl of the carb off...

[pepshocks]

Originally posted by jake"08"400
The fuel air screw is on the bottom of the carb its going to be recessed in the carb a lil depending on your year it mite look like a D are itl be a flat head if its older than a 05 I belive.....the pilot jet is inside the bowl of the carb its also recessed in the carb its also a flat head screw itl be under a lil plastic piece that sticks up when you pull the bowl of the carb off... any pics?

[jake"08"400]

At work right now can't show ya...but go to jets r us.com and go down to jetting 101 and itl have a pic of it for ya.

[pepshocks]

so the slow jet is actually the pilot jet?

[jake"08"400]

Yep its always goin to be the one with the lower number like 38 (which is stock) are 40,42,45 and so on...... the number will be stamped on either the side are the end depending on if its a real keihen jet are not....

[jake"08"400]

Well I went out 3 on the a/f screw and left the 155 main and 42 pilot....rode it around a lil wile today and it runs good no popping on decel and no going dead when a pump the throttle. I didn't do the plug test the right way but I did pull it and check it after my 30 mins to an hour of riden. And the plug is a grey color and its a new plug and the porclien part of the plug is still clean is that normal for just puttering around the house? Also around the tip where the threads start its brown color there.

[honda400ex2003]

got a pic of it? sounds like it is a bit lean but hard to say if it brown up on the outer edge. you could cut it down also and look at the ring on the base of the ceramic but i wouldnt waste my time doing that with a plug that isnt properly chopped.

until i see a pic, im going to say lean if there is any hint of white in it.

steve

[CJM]

A/F is to far out imho, up it one size and see what happens.

[honda400ex2003]

as marc indicated it would be a good idea to change it but ive always went by anything over 3.5 turns and you should go up a size or 2 on the pilot. he will have to go back down in the summer anyway most likely so imo if you can get by without it, i would leave it. unless you have one available to run.

steve

[jake"08"400]

ButYea that's the problem don't gota 45 pilot laying around and when summer gets here id be changing it back to 42 I'm sure since it was running fine in november when it was still in the 60s and its running fine now just thought id ask y'all bout the grey color. Its not got any white on it just a grey color and tan are light brown around the tip where the threads start and the porcelin in the plug is still clean looking. Sorry no pic at work again for the night. But with no more than I got I just don't see how my jetting could be far off and I'm about 800 feet above sea level.

[honda400ex2003]

gray would still indicate being on the lean side but only slightly. if you are going to ride in anything colder than what you rode in when you looked at the plug i would suggest doing something with it. otherwise, you will probably be alright.

steve

[jake"08"400]

I'll just do a real plug run on it tomorrow and see what it looks like I mite just put a 158 main in it and say screw it.lol I'm sick of taking the dang thing apart.....

[honda400ex2003]

it does get old after a while. do you use the quick access hole on the bottom? hit that with a 17mm wrench and use a 1/4" shallow socket to get the jet out and you can have it done in a matter of minutes. after you drain the gas out of it, pull the breather tube and it makes it much easier to get in there also.

steve

[jake"08"400]

Yea I did that last time. Now I gota order anthor jet though and wait for it to come in. Lol

[jake"08"400]

The only thing I don't understand is most guys I'm seeing that are running the same thing as me are running the same jetting as I am and the elavation isn't but 2 to 300 feet differnce than mine that's why I'm wondering if it wasn't that grey color because I wasn't putterin around like a paw paw lol.. even peoples jetting recamendations say around a 152 are 155 I'm just confused. Lol

[honda400ex2003]

every engine is different for sure. im sure that they dont change jetting for the cold. I never really did... I didnt really know any better either. imo the open box makes a big difference when it starts to get colder out.

its really hard to say without seeing a pic of your plug. it is probably fine, i just dont want to see you come back on after a long ride and say you blew it up. I would be pretty bummed if that happened.

steve

[jake"08"400]

Yea at this point tho id wether blow it up lol j/k not really but it for sure is gettin old but I'll just leave my plastics off forever so I can get to everthing itl make it easier prolly lol

[jake"08"400]

O and my box is closed up

[honda400ex2003]

note everything you change then you will always be set for summer and winter. ;) steve

[jake"08"400]

Let me ask you one more thing. I gota a adjustable needle laying around off a 04 400. Think it'd help if a put it in are just leave my stocker in at stock setting an just worry with the jets and such....I'm going to order the158 and 160 main think any bigger would be way to big and do ya really think I need a 45 pilot.

[honda400ex2003]

i would vote against the 45, get both the 158 and 160, you could put your needle in there but with it on the 3rd notch it will be the same as what you have now. this would be where i recommend to put it anyway. i would leave it for now until you absolute need it for some reason.

just my .02 though,
steve

[jake"08"400]

Yea that's what I was thinking to....well I'm ordering them now off jets r us ya need anything lol j/k.....but thanks man I apperciate ya! Ill reply sometime when I get it done prolly next week!

[honda400ex2003]

no prob and good luck! steve

[2001400exrida]

i think you will find that your main jet is probably pretty close to what you would need.

I tried to run a 42 pilot on my piped and air filtered ex and it was rich and would flood itself on idle or if i stabbed the throttle on idle. i put the 40 pilot in, with the 155 main jet and it ran like a champ. i also put a dj adjustable needle on 3rd clip setting and that seemed to help too.

if you're running good at full throttle now and your plug was grey it may have been darker when your quad idled but then it grayed up after you ran it.

mine would idle itself to a stop because it was just too rich on the idle setting, basically pilot jet was too rich for me.

[jake"08"400]

Yea I'm goin to run it tomorrow and see how it does and tinker with it I think it runs good just the grey plug I thought mite be bad but I'm goin to do a good run on it and see how it looks. It idles good and runs good mite go in on the a/f screw a lil but it doesn't flood are anything so idk.lol I guess I'll put it 158 in it an see how it does what's your elavation?

[jake"08"400]

That's my plug after idlen for about 5 mins.it was a brand new phone and it looks more tan in person kinda looks yellow....


<a href=http://s1115.photobucket.com/albums/k558/jakekeener/?action=view&current=20110118150237.jpg target=_blank><img src=http://i1115.photobucket.com/albums/k558/jakekeener/20110118150237.jpg border=0 alt=></a>



And this is it after about a quater mile WAOT...
I think I need a bigger main what y'all think


<a href=http://s1115.photobucket.com/albums/k558/jakekeener/?action=view&current=20110118151855-1.jpg target=_blank><img src=http://i1115.photobucket.com/albums/k558/jakekeener/20110118151855-1.jpg border=0 alt=></a>>

[JOHNDOE83]

You have to actually cut the plug to find out.

Just looking at it for the main jet setting wont tell you anything, I have a thread for it on here called "plug reading for jetting...info".

you might find some useful knowledge there also.

[JOHNDOE83]

heres the link.

http://www.exriders.com/vbb/showthread.php?s=&threadid=441780&highlight=reading

[jake"08"400]

I planned on cutting it just don't have my cut off wheel nor a dremel tool are anything at this house its all at my old house.....thanks for the link I'll look over it for sure. But I know you guys have all rejetted are had someone to do it for you I was just wondering what y'all thought about it the way it sets without being cut is all.....

[honda400ex2003]

second one looks pretty lean to me. id be jetting up wherever you were chopping that.

steve

[jake"08"400]

That second pic was wide open throttle. Still got the 155 in there

[CJM]

Originally posted by honda400ex2003
second one looks pretty lean to me. id be jetting up wherever you were chopping that.

steve

Agreed with steve, up it just one size and see what happens.

marc

[jake"08"400]

Ok thanks steve and marc again for yalls help. Also I turned my f/a screw back in to 2.5 I found it idles better at the than 3.

[CJM]

Glad to hear jake.

Report back what happens when you swap.

[honda400ex2003]

good to hear! report back final specs. steve

[jake"08"400]

Here is the number two plug in the pictures before (after i chopped it) this is side "A".


<a href=http://s1115.photobucket.com/albums/k558/jakekeener/?action=view&current=20110119153158.jpg target=_blank><img src=http://i1115.photobucket.com/albums/k558/jakekeener/20110119153158.jpg border=0 alt=></a>


And this is the other side. 180 degree turn. Side "B".


<a href=http://s1115.photobucket.com/albums/k558/jakekeener/?action=view&current=20110119153230.jpg target=_blank><img src=http://i1115.photobucket.com/albums/k558/jakekeener/20110119153230.jpg border=0 alt=></a>


As you can tell to me side A looks good nice dark brown. But it doesn't go all the way around it so what's this mean?

[JOHNDOE83]

more main jet IMO.

[honda400ex2003]

I would say that if you want to go any more than 10-15 degrees below whatever you were testing in today i would go to a 160 otherwise, i say leave it. that looks pretty good imo.

the ring not being full all the way around imo shows that it could have been a bit longer test. By longer i mean a longer run at WOT to show more ring on it. just my opinion though.


steve

[jake"08"400]

I think I'll put the 158 a guess a lil rich is better than lean espically when we are going threw the woods at wot in the summer. Its a 155 now so a 158 should be good just from the lil experince I got now lol. Cause itl be warm again in bout 2 months.

[jake"08"400]

I guess I really don't know I mite just leave it alone idk what to do with it lol

[honda400ex2003]

if that was with the 155 from the other pic then put the 158 in there. steve

[jake"08"400]

Yea the cut plug is the same plug as plug number two in my other pics before

[pepshocks]

Can u change the pilot jet with carb still on quad?didn't know I'd you can losen clamps n turn carb n pull bowl off while still on bike?

[honda400ex2003]

not the pilot, just the main can be done with the hole on the bottom of the plug. the bowl has to come off to get the pilot out.

steve

[jake"08"400]

I put the 158 in no plug chop yet cause I don't have any left lol. But I'm pretty sure its goin to be this main I need felt much better and plus id wether be a tad rich than a tad lean. I'll get some chop pics soon till then thanks again steve and marc.:)