[Cobra20646]

Mike,
I take it that it's all RPM related and not speed related right? Like it still shakes when sitting still and just reving the motor?
I also assume that the the flywheel. clutch, plate and tranny was changed all at the same time too?
If thats the case, I'd check the flywheel for proper balance. You didn't say, but early motors used 28 oz ext balance, and later motors used 50 oz. If the motor was balanced by the builder, you may need a neutral balance wheel.
You might also check the crank damper for proper balance.
- Jim -