2004 400ex's

[RIDER11X]

Is there truth to the bigger carb spec. on the 2004 400ex's? Some say it is true, others say it is a misprint.:confused:

[RIDER11X]

Here are the 2004 specs:



Engine Type 397cc RFVC air-cooled dry-sump single-cylinder four-stroke

Bore and Stroke 85.0mm x 70.0mm

Carburetion 38mm piston-valve with accelerator pump

Ignition Solid-state CD with electronic advance

Starter Electric

Up until now, they were always 35.5mm carbs.:eek:

[Out_Sider]

i dont see how you can misprint 38 when the original carb was 35.5..i believe that it is a bigger carb, but who knows

[RIDER11X]

Does anyone know of anyone with a 2004 model?:confused:

[Flo Bee]

Originally posted by Out_Sider
i dont see how you can misprint 38 when the original carb was 35.5..i believe that it is a bigger carb, but who knows

You're right, that would be one hell of a typo.

However, Honda lists it as 38mm this year on everything I've seen. You can even look at '03 vs. '04 on their site and it notes the difference. I've been out of the game for too long to know if it's actually different.

[04'400ex'er]

I have one, but dont know how to tell the size?:rolleyes:

[RIDER11X]

Originally posted by 04'400ex'er
I have one, but dont know how to tell the size?:rolleyes:

I think it says right on the carb someplace.

[bradley300]

i asked my dealer aboput the 04 carb for my 300ex so he looked it up- same part number as the old ones

[400exrules]

Originally posted by bradley300
i asked my dealer aboput the 04 carb for my 300ex so he looked it up- same part number as the old ones

they're talkin about the 400ex, the 300ex should be pretty much the same as 03, i dont think anything changed on it, besides decals

[K_Fulk]

I looked in my service manual that was printed in 2002 . And it has the carbureturs throttle bore listed at 38mm. The part number hasnt changed any either i'm pretty certain its the same carbas previous years.

[hondarider2006]

What is the differnce between the '00 and the '01 carbs? I know there is somthing, but not 100% sure what.

[K_Fulk]

Diffrent venting

[bradley300]

Originally posted by 400exrules
they're talkin about the 400ex, the 300ex should be pretty much the same as 03, i dont think anything changed on it, besides decals

i mant that i was asking to put the 400ex carb on my 300ex, he looked up the 03 and 04 400ex carbs, and they are the same part number

[RedEx XCRider]

the difference between the 00 and 01 carbs are the floats and stuff they all Stickwhille your rideing and going up inclines the 01's don't do it i think

[MrTrendy1]

Originally posted by RIDER11X
Does anyone know of anyone with a 2004 model?:confused:

I've got and I don't remember seeing the size on it. I do know mine is a keihin and thats about it. If someone could tell me how to measure it or something, I'd go do it and let everyone know.

[striaghtarrow]

Mine brand new one should be here next week so if some one wants to tell me what they want measured i will do it for you

[ewalker302]

Originally posted by K_Fulk
I looked in my service manual that was printed in 2002 . And it has the carbureturs throttle bore listed at 38mm. The part number hasnt changed any either i'm pretty certain its the same carbas previous years.


In my Honda manual----Date of issue September 1998

It lists the throttle bore as 38mm (1.5 in)

I'm not certain, but I think this may be the interior measurement of the carb on the end where it mounts to the intake manifold.

???Maybe the 35.5mm is the typo and the 38mm is correct for all models.

:bandit: