Is this a stock 99 WR400 carb?


6 replies to this topic
  • chickenstrips

Posted May 17, 2008 - 10:44 PM

#1

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:

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Does that hole need to be plugged or anything?

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Thanks.

  • LiveSideways

Posted May 18, 2008 - 02:16 AM

#2

Stock Keihin FCR 39

  • Birdy426

Posted May 18, 2008 - 10:35 AM

#3

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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  • chickenstrips

Posted May 18, 2008 - 12:05 PM

#4

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.

  • D-Z

Posted July 23, 2009 - 11:11 PM

#5

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!!

  • gtcodave

Posted June 20, 2013 - 02:59 PM

#6

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?

  • grayracer513

Posted June 20, 2013 - 03:11 PM

#7

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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