I have heard many people say that their bikes have a vibration @4500 RPM. (is this Gen I)? My 08 doesn't have any vibration @4500 but it does vibrate a lot @ 6500 - 7500. It's not much of a problem because I never stay at this RPM. I'm always passing through it, on my way up. In fact it lets me know my RPM without looking at the tach. I'm just curious if anyone else has this?