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If you are talking about the rubber collars that the through bolts go thru to attach the engine to the frame, then the torque is something like 18 or 24 foot pound - very light tension. Have you tightened them, recently ? Refer to the maintenance section for correct figures. loosen them off , run for a minute or two to settle, then tension to the correct value. 
Has any replaced your balance dampers, left and right, in the 800? if so, what conditions lead you to do so, and what results?
I've got strong vibrations from 3400-3900 -- which is right in prime cruising speeds
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