Is this a stock 99 WR400 carb?

1999 WR400F

I bought the bike used and was not told anything about the carb being changed out, but from what I've seen it doesn't appear to be stock (no linkage cover?).

I need to know if it is stock or something like a FCR41 so I can order a few parts for it.

Need float bowl o-ring gasket, intake bell o-ring gasket, accel pump diaphragm and o-rings (may be a good time to go to a larger AP?).

Anything else I should consider replacing? The wheels on the arm that pulls up the slide looked a bit worn, but nothing else looked bad.

I also wrote down all the jet sizes and needle type for looking at after I figure out which model of carb it is.

Pictures:

IMG_1613.jpg

IMG_1612.jpg

Does that hole need to be plugged or anything?

IMG_1616.jpg

IMG_1617.jpg

IMG_1628.jpg

IMG_1618.jpg

Thanks.

Stock Keihin FCR 39

Stock except for the Power Now (Gold colored intake bell that replaced the stock plastic piece. It has a "wing" in it to increase air flow velocity at part throttle settings.

Stock except for the Power Now (Gold colored intake bell that replaced the stock plastic piece. It has a "wing" in it to increase air flow velocity at part throttle settings.

Cool Thanks, i will order up some parts for it. Is the stock A.P. sufficient? I will just order a new diaphragm for it.

i noe this is an old thread, but i need help!!ive got the same carb fcr3 41 on my wr400..but mine boggs all through the mid and top end, and backfires like a machine gun.. ive already did send it to my mechanic but seems he is unable to fine tune the carb..wats the jetting like? i have a FMF powerbomb header and whitebrothers e2 exhaust and the bike is on YZ timing..

any help appreciated please!!

correct me if i'm wrong and i know this thread is a bit of an archive but didn't the WR400F have a 39mm bore carb?

Yes it did.

Once the old FCR's get worn and tired, the best thing to do with them is replace them with an FCR-MX from a later model. The '05 and up YZ450 carbs are an excellent choice.

You would need the 450 cables, and the complete hot start assembly as well.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now