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[Trevo]

When I'm driving my 2005 Yamaha blaster it's drives fine but when you get on it it vibrates the piss out of the whole four-wheeler.

 

[nick20555]

Make sure the mounts for the motor are all tight. Same for everything around the wheels. Is it vibrating proportional with speed or proportional to the engine rpm? Could also be your counter balance out of time.