I have an 09 KX85 that had about 22hrs on it when it quit. I pulled engine apart and found RH wrist pin clip a piece about1/4 in long broke off and damged piston and cyl rest of clip was still in groove. So installed new piston and jug engine run for about 14hrs and quit again. Pulled eng apart and found exact same thing happened again RH wrist pin clip chunk broke out damaging cyl and piston. looks like there was end play in wrist pin i measured approx .015in. measured different pin lengths were all about .003-.005 in difference. Looking for some help determining what would keep causing this as it happened even when the bike was new out of box. Faulty parts?. also have always used OEM parts.