Help! Engine Vibration

Something is wrong with the damper if it is wobbling, they are not supposed to do this. I have seen in some cases where the damper doesn't fit snuggly onto the crank snout.

Tell us how you installed the damper. These should be a very tight fit, requiring the center bolt to pull it on. I'll bet your damper fit on the crank is loose, which is causing the damper to wobble and also maybe (not 100% sure) causing the vibration problem.

If the fit is loose, I have seen some backyard mechanic fixes for this problem.

One motor I took apart had this issue apparently, someone prior to me had taken a very sharp center punch and punched the circumference of the crank snout in an even pattern over the contact area every 1/4 to 1/2 inch creating raised areas which allowed the thing to tighten up. I don't like this idea but it worked.

Another idea is to try using red loctite on the mating area of the crank. Allow the loctite to set up overnite and see what happens.

A third option would be to try one of the fluid dampers, Ive heard these fit extremely tight on regular cranks and have heard of people having to use a damper installer instead of using the bolt to push the damper on. Maybe one of these would be tight enough to do the trick. Keep in mind you may need to monkey with the pulley alignment afterwards.

4th option. remove the damper, measure the crank snout with a mic, and then have a competent machinist remove enough material on the inside of the damper to allow a sleeve to be installed and then have the sleeve turned down to the correct size for the crank.

5th option - Punt ?

Hope this is helpful and let us know what you find.