My friend has a 400ex, with a fmf pipe, stage 2 hotcam, and a K&N w/no lid.
He wants to get a bigger carb, what size do you rec? I hear good things about FCR, anyone else?
Best place to get one? Anything I should know for the install (extra parts, ect.)?

 

39mm

 

i would think the 39 would be good. i would get the fcr. look at www.sparksracing.com for pictures. they may be a little high on prices though. i would call C & D racing and they would be able to answer your questions. i am not positive, but i think they sell the fcr carbs. the # is 308-696-7805