Is it just me or do 1650's seem to be more prone to develope engine vibration and mounting bolts go missing? My friends 1650 had a couple bolts missing and engine vibrations too. The engine was slapping(when he throttled up it was real bad) on the mount/frame which caused a wear in the pan and we chased the treads and added a couple washers to adjust for mounting. I'm just curious if this is a common problem on any of the quietlines because of the iso mounts going bad.