Re: Extreme engine vibrations at higher rpm's...
Question: Why are you reving to max rpm with the clutch disengaged? Would you do that to your car's engine, or a motorcycle, or a lawn mower? If there is a problem you're sure to find it eventually by over reving the engine. If there is no problem there will be soon.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"