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chickenstrips

Is this a stock 99 WR400 carb?

7 posts in this topic

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.

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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.

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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.

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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!!

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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?

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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.

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