Originally Posted by 2door
I have two identical bikes. One has a rag joint, the other a hub adapter. The adapter equipped bike has a 'roughness' to the ride that I couldn't account for.
A rag joint is a natural 'Cush' buffer between the motor and the wheel. It takes out a little bit of the 2-stroke motor pulse and jolts from sudden power changes like dropping the clutch from a fast coast with wide open throttle.
As for spring tensioners I find them useful for shift kit builds when the only way to adjust a chain is to move the motor.