My son and I recently replaced piston, rings, ect. on our 2000 kdx 220, put it back together and started it up and cooled it down a few times and everything seemed to be fine. When I started to run it hard it just died.Sounded like it seized.Anyway I tore it apart again and one of the circlips had popped out and jumped all around in the cylinder scarring both sides. The circlip appears to be all there but alittle staightend out and was stuck in the cylinder wall.My questions are do you think its better to replate the cylinder or boar and sleeve it? And what about spitting the cases to look for some small metal fragments? Thanks for replies