the vibrations are because the bike has an unbalenced flywheel. there is no way to cure but replace the engine or flywheel.
i suggest double bolting everuthing whith locking nuts as ive had mounts undo themselves among other more minor problems.
also keep it out of the weather as the plastics will not last if you dont. mine became brittle and broke as a result of the mixture of weathering and vibration and are NOT! cheap to replace