Ok my Yamaha Gods-- I have a 2000 yz 426 , has been running great, lately when starting for first ride I must push start it. (yes very hard) I have ridden it very hard last two years on supermoto tracks- oil changed every race weekend(Motul 10/40 full synthetic) air filter etc. By the way this bike has taken a 245lb rider to a 2nd in points Starrs Supertt class and current 2nd place in points. The only track it lacks power is Willow Springs. I have not checked the valves(ever) BAD BAD ME!! I am also curious about a key that comes loose on the crank? I am considering a big bore kit and hot cams.. what about the bottom end? Thanks in anticipation for your help.