My nephews 2005´Buell Blast 500, Parents going through a divorce and I need to get my nephews back on his own 2 wheels. His Buell Blast has a weird vibration some times it will smooth out then start back up, Hard to pin point location. I pull in the clutch and it still continues, some times it seems to be coming from the motor other times the rear end. Anyone have a way of process of elimination so I can pin piont the problem and start repairs. Any suggestions will be appreciated. Thank you