Csk Posted January 5, 2021 Report Share 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 Link to comment Share on other sites More sharing options...
SKEETER Posted January 5, 2021 Report Share 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 Link to comment Share on other sites More sharing options...
gusto Posted January 6, 2021 Report Share Posted January 6, 2021 (edited) Generally speaking, your good on small bore pipes until 465cc Edited January 6, 2021 by gusto 1 Quote Link to comment Share on other sites More sharing options...
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