Originally Posted by
David Mason
Check Alingment. Sometimes when you adapt a powerhead to a different tower with an adapter plate, you might be slightly off center. Same for the gearbox. This will casue a vibration. Also, if you are using a coupler for the driveshaft, it could be off center a little. For example, we use a driveshaft squared to 12MM. That 12MM square end may be off .005 from center in relation to center of the driveshaft diameter. Just a thought for you to check. Another thought is perhaps the crank is not balanced correctly ? Sometimes the factory could put out a crank that was not real balanced. It would work fine for a fishing version engine, but wind it up to race RPM's and she shakes.
Just food for thought, and it might not even be close to the real issue you are having.
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