Hi, I recently bought a GPZ1100s from a local Kawasaki dealer, it came with 3 months warreny. I had to take it back to have a new Cush drive fitted and valve clearences done under the warrenty. Since I got it back, I have noticed a bad vibration as the engine revs go through 2000 to 3000 rpm. Dealer says they cant do anything about it. Any help would be appreciated