I've been chasing an engine vibration on my 2003 Rod for a few years now, it comes in around 3500rpm and increases through the rev range. It goes through the bars, pegs, and seat. It goes away when clutched and can be produced stationary free revving. I've replaced front & rear engine mounts, replace clutch pack, changed exhaust,inspected every inch of the bike for rubbing components, even different tunes without success. The vibration started when I launched pretty hard once felt a slight thud and has slowly gotten worst over time. Also have looked for cracks in the frame. Need help.