[Mart]

I may have it wrong, but the flywheel has been in bad shape for a while. If it has been skimmed, it may not have been for the first time. The factory balance may have been lost. I would be looking for a non skimmed but serviceable 59A flywheel that still has it's factory balance. If not have the flywheel and clutch balanced as a unit.

As Colin says, if they are checked and are within balance specs, the imbalance must be deeper within the motor.

Sorry to always seeming to be the bearer of bad news.

Mart.