On my '91 ZX-11, at a complete stop, when I let out the clutch VERY slowly with a little gas, it accellerates fine. But when I give it more gas and let the clutch out faster, like a during a hard launch, it vibrates like crazy and the clutch grabs hard and almost stalls the bike. But after the bike is rolling I can nail it hard and shift at the redline, and I notice no slipping at all (and no surprise to you all, I have to hang on TIGHT). Is my clutch going bad?