Will a 04 yzf 250 carb work on a 99 wr400?

Hello all,

I'm asking the above question only because I'm sick of the external accl. pump on my 99. I'm well aware that I will need to change the jetting. I just would like to know if anybody out there has done this? This site is a great resource of info, thanks in advance...

Dave Nash

i think the 250s use a 37mm carb. you want the 39mm carb!

so, no!

It will fit in the airbox boot, but is not the right inside diameter so the airflow won't be correct.

Yeah, so no.

yes i think your right^.

reguardless, you need an FCR39 and the 250s dont use them!

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