just changed from 600 to 1200 noticed the vibes straight away.some at 2000 r.p.m. but most at 4500 r.p.m. .just had carbs balanced,made no diference.As bike is still in warranty suzuki have agreed to strip motor and balance crank. will keep you up dated.
Do I understand you correctly? Zuki is stripping motor and balancing crank under warranty? How the Hell did you get them to do that? From what I have read here getting suzuki to follow up on warranty work is like pulling teeth. That vibration must be extreme. And if we are talking about a fairly new bike shouldn't you be going for a replacement?