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Ponyboy96: an aftermarket primary clutch has all of the benefits mentioned by MGRAM and KWIK plus most that I'm aware of have a smaller one way bearing. This means that the belt runs in a tighter circle in the primary clutch. If you picture your primary and secondary clutches as toothed sprockets on a sport quad you have essentially put "a smaller front sproket" on your drive "gear". That means your starting gear ratio is lowered. An aftermarket primary reduces your starting gear ratio by 20% depending on which clutch you have chosen to run.

MGRAM: is the gen 2 STM balanced now? If I remember correctly that was their biggest design flaw.
 
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