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Is bigger better in this case?

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Have an 06 crf 70 that I installed the 88cc bbk with new head and cam (not race cam). Head has std size valves, but a lot of porting work on exhaust and intake.

My question is will a 24mm carb and 24mm intake neck improve throttle and power or should I stay with the stock intake neck and 20mm Kehin carb?

I have seen complete sets for $650 that include a 20mm carb- why don't they use a 24mm if bigger is better?

Any help from people that have already done the trial and error- or direct me to a thread that has already discussed this would be great! (( *_* ))

Spring is almost here in Nashville and my 10yr old is ready to ride!

Thanks/ Doug

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