I have a stripped down 92 flstc that I just had rebuilt by a reputable builder. 10 over Harley pistons, comp cams lifters, SE pushrods, Crane 300 2-b cam, Jims breather gear, S&S super e, accel coil wires & stator Heads were milled 0035 & rebuilt w/all new parts. 5spd HD trans, new primary and drive chains w/new sprockets 24/48. This thing runs great, I'm impressed, the thing is I'v got VIBRATION from abt 2200 through 3400 so bad you have to concentrate to keep you feet from buzzing off the floor boards than goes away. I've checked my motor, trans, primary mounts, compensator sprocket, all's well. It feels like the bottom end. fly wheels. I've had a couple other people ride it and tell me the same thing. I was hoping it was the nature of the beast and I'd get used to it. I've put abt 1,800 miles on it. Not used to it nor do I want to be. Its not a pleasure to ride any more. I put close to 70k on this motor before rebuild and it was very smooth. ANY IDEAS out there of what this could be , other than what I'm afeared of. THANX