Whenever I ride my blaster I get off and it's like I'm having a seizure. And when I ride it also vibrates like crazy, especially in the powerband.
We tore apart the motor to put a new crank in but I never looked at the counter balancer. We once worked till like 11 pm and I was spinning the motor to make sure it turned good and accidentally slammed my pinky between two gears.
Have you pulled your clutch cover off to make sure your counter balancer dot is aligned to the gear to the left of it? Hell my bike has a little vibration but not like your describing....but if the counter balancer is off a tooth in either direction..it will vibrate the hell out of the bike...