How did you break the motor in? I put a light coat of two-stroke oil on piston to put it in the cylinder. Then I start and warm the bike up 4-5 times before riding it. Then on the first ride, I baby it around for about 15-30 minutes, let it cool all the way. Then I give it hell everytime. I just brought that up because I have melted em down before, during break-in. The throttle was adjusted out too far. It started, went crazy for about 20 seconds, then died. It was crazy, man. I have two kill-switches, didn't stop it. Pulled the plug-wire, didn't stop it. Pulled the gas line, that stopped it eventually, but like I said was melted down and pricey mistake.