4-speed chatter problem

Revhendo said

I've done the bearing with several conversions (including 5&6 speeds), it's a viable option. Just make sure the shaft isn't hanging up in the crank.

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Bingo, same thing I was thinking maybe too tight in crank bushing, and clutch not centering itself right, also dumb question, is the driveshaft balanced ? vibration issues can be a ***** to find, check all the obvious things first.