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Posted

Looking for imput building a 421 banshee waiting on frame from powder coating shop have already got engine back from hjr just buying everything else to be ready in ride a lot of open fields very few tight trails love riding high speed wheelies but high speeds to any suggestions on sprocket size

Posted

17/38 on my 421 cub HJR drag ported, and unless you're on pavement it still blows the tires off. That's with +6 swinger. It really kinda depends on what port work was done and what other mods you have.

Posted

It really depends on tire size and what you like. My super serval makes a ton of power but the 15/41 gearing along with the 22" tires make for very long and fast(mph) gears. The +6 i have sucks for wheelies and handling. Id try whatever gearing yo have and go from there.

Posted

I went with the kenda 20x11 xcr I definitely don't want these 450 dirtbikes walking me down though. Thanks for imput on swinger I was not sure if I made the right decision with +4 glad I did

I have not had any bike touch my 421 cub.

Forget what sprockets, and 20" tire.

  • Like 1
Posted

I'm not sure how yours will do with 17/38 mine is drag ported. It idles in first gear around 10/15 mph, not really a trail friendly setup with +6 swinger and very violent (for lack of a better term) acceleration.

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