fcr39mm or 41 tapered 43?

[400exmxracer]

Which carb should I go with for racing mx? They're both fcr. Set up now: ported polished head 3angle valve job 11/1 426 stage 2hc fmf powerbomb header big gun EVO r slip on diet digger clutch hinson clutch basket stage 3 cdi and I'm sure I'm forgetting stuff

[400exmxracer]

The 41 mm is tapered to 43 mm.....wasn't sure if I made that clear or not

[drew416ex]

I would say the 39mm. The larger carb may give you a couple extra hp on top, but the 39 will give you a little more snap on the bottom.