Thanks in advance for any help. Bought a 93 cr125 this summer and have had nothing but problem! The bike ran fine for the first couple of rides a little bit boggy coming out of corners but hitting the power band no problem. It then started to stutter, almost coming on and off the power when the throttle is wide open! So pulled the engine and found lots of oil in the flywheel side cover. Read here that the seals were bad so changed them( without splitting the cases) and the bike ran the same! So pulled the top end and the piston and rings were gone( the piston being quite heavily scored but the barrel in good shape) so put a new piston in it and still it runs the same( stuttering and not wanting to hit the power band! Any ideas?