Csk Posted January 5, 2021 Report Posted January 5, 2021 I have a 421 cheetah cub. I wondering if they are small bore or big bore exhaust ports. I am also looking for a set of drag pipes. Quote
SKEETER Posted January 5, 2021 Report Posted January 5, 2021 68mm bore. You want small bore pipes, however, my 421 cub ran great with a set of Shearer's off a 630cc motor. :shrug: Quote
gusto Posted January 6, 2021 Report Posted January 6, 2021 (edited) Generally speaking, your good on small bore pipes until 465cc Edited January 6, 2021 by gusto 1 Quote
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