hey , new to the site, so far alot of helpful posts so hopefully some good help on this one. i recently bought a 01 kx 65 from a guy who did not know what was wrong with it, so i took it home to find out it had a bog at mid to full throttle, come to find out the main jetting on the bike was too small to go with the fmf pipe he had put on it. so i up the main jet to a 230 (recomended by fmf) put a new br10 plug in it and some new 32:1 high octane fuel. bike runs like a rape date, for about 30 mins then dies. pulled the head off piston and walls look ok but there is some play if you bring the piston to top dead center you can push the head of the piston down maybe 1-2 mm , possible a wrist pin or rod main bearing problem?? Any others with this problem? And how can you tell if its from the air fuel mixture of the bike or if it was just coinsidence? help would be greatly appriciated :bang: