theonlyChummy Posted March 5, 2018 Report Posted March 5, 2018 when looking to purchase a set of in-frame pipes, what is the line in the sand on deciding what pipe to go with? bi or small bore? going with Assassin 421 HP jugs Quote
trickedcarbine Posted March 6, 2018 Report Posted March 6, 2018 99% of the 421 motors out there perform better with a small bore pipes. The typical cut off point is about 500cc's depending on pipe manufacturer. Quote
camatv Posted March 19, 2018 Report Posted March 19, 2018 really depends on the pipe. some " bigs and small" are just a different stinger size. others are very different pipes.. Quote
specialblend07 Posted March 20, 2018 Report Posted March 20, 2018 Didn't GRR say there was no such thing as big/small bore pipes? I also believe he said any builder who said big bore/small bore pipes didn't know anything about pipe building... Whatever happened to GRR.... Quote
trickedcarbine Posted March 22, 2018 Report Posted March 22, 2018 On March 20, 2018 at 4:21 PM, specialblend07 said: Didn't GRR say there was no such thing as big/small bore pipes? I also believe he said any builder who said big bore/small bore pipes didn't know anything about pipe building... Whatever happened to GRR.... Drugs... Quote
BANSHEE HP Posted March 22, 2018 Report Posted March 22, 2018 at 465cc you should dyno both big and small bore, my money would be on big bore. Quote
JUSTWANNARACE Posted March 22, 2018 Report Posted March 22, 2018 It all depends on riding style and where you want your powerband. On say a 421 cub a big bore will usually out perform on the track(drag) and a small bore will perform better on the dunes and trails.. jmo Quote
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