If you want more performance go with a cam,rejet, and a better exhaust. I have a 63mm bore 6mm stroke a killer cam that don't like to idle and run a 30mm. My son has a 62mm bore 2mm stroke and 4 valve head and he runs his stock carb 26mm. The cam will make a bigger difference then go with a 26mm instead of the 24mm. Cheaper too.
TOM
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