If the cutless bearing is new, and the shaft is straight, and the alignment is proper any vibration in the shaft has to be coming directly from the motor. We just replaced the mixing elbow
on our yanmar
due to a couldn't reach full rpm
issue and a side benefit was a reduction in shaft wobble at midrange rpm
. Is it possible you have either a partially plugged elbow
or injector causing the engine
to vibrate more than designed?