2004 400EX carb 38mm?

[dldaniels]

I read on a web site of 2004 400EX specs it says that they now use a 38mm carb stock. Is this true? Would one of these new stock carbs work well on an older 440EX?
Thanks, Doug
dougdaniels3@yahoo.com

[quad_62]

i've heard both that it is a typo and that it is true. the thing that makes me wonder if it is true is the fact that honda still hasnt corrected it on their website, which doesnt take long at all to do.

[UglyMotha™]

if you look up towards the right top of the page you see this button http://www.exriders.com/forums/images/new/search.gif you'll find it very handy :o


cause this topic has been so beat to death :huh

[riverex]

acording to my manual i have a 38mm carb on my 2002 ex i also have a service manual from honda and its a 1999-2001 book and it says the same.

[coryatver]

Originally posted by UglyMotha™
if you look up towards the right top of the page you see this button you'll find it very handy cause this topic has been so beat to death :huh

Yeah But there hasn't been a clear answer given!!! Someone please measure there 2004 400ex's carb and clear it all up once and for all...

[nico400ex]

yes, I have a 400ex 2000 and I measured my carb an is 38 mm.

pd: sorry for my english . I am from argentina

[JOEX]

Originally posted by nico400ex
yes, I have a 400ex 2000 and I measured my carb an is 38 mm.

pd: sorry for my english . I am from argentina
Your english is just fine, better than alot of the North Americans here;) :)

Where is the carb measured at?

Joe

[nico400ex]

thank joe.:D

eeeee, I measured in the side of the head, not of the air filter.

The carb has the same part number from a 99 400ex and 2004 400ex.

Wouldn't you think if the carb was changed so would the part number. Does it make since to have 2 different size carbs on the same shelf with the same part number, so when you order one it's up to the parts guy to do an eeny meeny miny moe on which carb he want's to give you. Don't YOU want to know which carb is which before you bought one?? This is all horsechit I say.

Untill someone posts pics of an older 35.5 carb and a new 38 carb with some type of measuring device in the pic showing the different measurments I'm callin it a typo. Someone please proove me wrong because this issue has been beat to death and there's not one fact in any post that states which is which..

[sickmojave]

Originally posted by Rico


Untill someone posts pics of an older 35.5 carb and a new 38 carb with some type of measuring device in the pic showing the different measurments I'm callin it a typo. Someone please proove me wrong because this issue has been beat to death and there's not one fact in any post that states which is which..

I agree with you Rico. it's all talk till I see proof one way or the other.

[SPEED-MDS]

my 04 honda service manual says that the carb is 38mm. I dont think that honda would have misprints in every piece of info that they put out! Has anyone seen an up to date dyno run of an 04 400ex compared to an 03? If it is true than it should show on a dyno and also make the 04 more responsive to mods with out droppin $400 on a new carb.:)

[bradley300]

they could possibly if thier stealing info from the XR manual

But how does the carb have the same model number. If you went to get a new set of shocks for your truck. Wouldn't it consern you that 2 different length shocks have the same part number:confused:


manual smanual...I wan't proof:macho

[UglyMotha™]

seriously in my oppinion if honda did indeed change it i think they would have done away with the 35.5 and replaced it with the 38 cause in my oppinion the would be less confusion rather than haveing two different carbs for the same bike so more than likely if you order a carb for you 99 than your goin to get the 38 replacement, this is my assumption still don't have any hard evidence though :o

[04EXdude]

Originally posted by bradley300
they could possibly if thier stealing info from the XR manual

Couldn't be! The XR400 has a 36mm carb.

[sickmojave]

Well after reading this again I went to my local Honda shop(Heartland Honda) and asked the guys in parts to look up the carb for the 04' 400EX . we looked at every bit of info on this carb. there is no doubt in my mind that the 04 has a 35.5mm carb. ALL parts interchange from 99' to 04' including the jets. the 04' still uses a 38 pilot and a 148 main. there is only one part number for this carb because it's the same carb. he even showed me the parts on his computer. it showed that the main body of the carb for all years has the same part number. A quote from him " if Honda had changed even the smallest detail on that part they would have added a different number for it"

[04EXdude]

But there IS two different part #s for the 35.5mm carb. They had prefixes after the part #, A and B. The difference was the fuel vent on the later models. It doesn't sound like the dealer had the right info....................AGAIN!

[400EXrider77]

in my manual (1999-2002) it also says that its a 38mm, so im almost convinced it is a typo.

[cals400ex]

Originally posted by 04EXdude
But there IS two different part #s for the 35.5mm carb. They had prefixes after the part #, A and B. The difference was the fuel vent on the later models. It doesn't sound like the dealer had the right info....................AGAIN!

yes, they did revise the carb. i think it was something with how the float mounts into the carb. some of the 99's and 00's had problems with leaking quite a bit of gas or wanting to stumble when climbing steep hills or doing wheelies. they revised the carb in 01.


i know it says we have a 35.5mm carb too. i measured my carb (2001) and i came up with it being exactly 38mm. so either i don't know how to measure or something else is the problem. by the way, i measured from the smaller diameter on the carb. who knows.

Originally posted by cals400ex
yes, they did revise the carb. i think it was something with how the float mounts into the carb. some of the 99's and 00's had problems with leaking quite a bit of gas or wanting to stumble when climbing steep hills or doing wheelies. they revised the carb in 01.


i know it says we have a 35.5mm carb too. i measured my carb (2001) and i came up with it being exactly 38mm. so either i don't know how to measure or something else is the problem. by the way, i measured from the smaller diameter on the carb. who knows.


Measuring just the opening at the front of the carb will be 38, inside at the slide is were the actual measurement needs to be taken..:cool:

[cals400ex]

Originally posted by Rico
Measuring just the opening at the front of the carb will be 38, inside at the slide is were the actual measurement needs to be taken..:cool:

that could have been my problem. i actually don't even remember it being smaller in there. i will check that out next time i have the carb off.

[Evan400ex]

I'm confused, so from 01' to 04' the ex's have a 38mm carb??:confused:

[quad_62]

nope, only the 35.5mm

[UglyMotha™]

my 02 has a 38 :o

[JOEX]

Originally posted by UglyMotha™
my 02 has a 38 :o
Can you prove it?;)

[UglyMotha™]

there ya have it, crappy pic but nuf said :o ;)





http://www.imagestation.com/picture/sraid103/p961ab1d3122152754da61da48751c07d/f9a28d23.jpg

Originally posted by UglyMotha™
my 02 has a 38 :o

Mine has a 38 also..:o With the help of Sparks Racing..:blah:

[sickmojave]

Originally posted by UglyMotha™
there ya have it, crappy pic but nuf said :o ;)



Sorry but I can't read it .what does it say? I guessing that you had it bored.

[UglyMotha™]

it says rocky ridge - trik flow -

[sickmojave]

Originally posted by UglyMotha™
it says rocky ridge - trik flow -

if you had it to do again would you still go with boring a stock carb or would you just put the money in a FCR carb?

Originally posted by sickmojave
if you had it to do again would you still go with boring a stock carb or would you just put the money in a FCR carb?

Well If my money tree wasn't stolen I would have went with an FCR.

Having my head mildly ported, opening the airbox up a little and adding the bored carb for half the price of a FCR I'm probably pretty close in HP gains if I were to just add an FCR and leave the other changes alone. Hope that makes since. The FCR is surely gonna be much better than a bored stocker but the price is outrageous.:mad:

[UglyMotha™]

ditto :o


For the money ya just can't beat it

[JOEX]

There's some answers I wanted to hear;) :)

Joe

[dldaniels]

Who does these carb modifications and how much does it cost?

[UglyMotha™]

Originally posted by UglyMotha™
it says rocky ridge



270-259-9604 give em a call, and there outta kentucky so you can pick the appropriate time slot :o

[YZROOSTINYA]

i HAD MINE DONE

fOR $125 ITS :devil:

[EXDUNER127]

Yah i contacted rocky ridge and they said they bore it to a 38.5 and the stock size of any 400ex is 35.5, and you have to measure inside toward the back and not the opening. he says they bore it and add a new butterfly.

[hondafox440]

I always thought that carb diameter referred to the diameter inside the venturi, so you remove the slide and measure the inner diameter of the verticle chamber that the slide sits in (venturi).