I recently purchased a 2008 Yamaha Roadstar 1700 from a local dealer. The bike had 0 miles on it. I rode it a bit and found it acceptable, but noticed a bit of vibration. At the time I attributed it to the big engine. After riding it 2 weeks I have found the vibration pretty obvious in the handle bars, seat and floor boards. It varies with speed and gears. Is there an easy solution for reducing some of it in the handle bars?