Thanks for the all the pointers but I am pretty sure it is in the engine, when I ride it is generally in the 2500 to 3000 rpm range and if I am cruising along and pull the clutch in and coast, the vibration is gone, so that tells me that it must be in the engine, even when I ride alone there is a slight vibration in the same RPM range, starts at 2500 and stops around 3000 or so, it is not very bad when I am by myself, when I add a passenger thats when it is really noticable, I just am not that sure on what could cause something like that, Cam, Clutch, Primary Drive, etc? I don't know, anyway thanks again for all the help guys, and like Fibersnake said, maybe the best option is to get her a bike and have her ride along with me instead!