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Get the crank dynamically balanced.

If the engine mounting bolts are not a nice snug fit in both the frame lugs and in the engine cases, that can also cause excessive vibration. The top bike builders ream/drill the cases and frame to accept slightly larger diameter bolts that fit snugly.

Think about lowering the compression slightly (thicker base gasket/head gasket) or, if you're buying new pistons, slightly lower compression pistons. The engine might put out slightly less power but it'll be easier to start and less vibratory.

Lowering the final gearing (one tooth bigger sprocket on the front, or two or three less teeth on the rear) will give you lower rpm at highway speeds, better gas mileage and less vibes.
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