it hasnt broke but for the 1st half gallon of blue thunder it would run real nice, after a half gallon i only get 5-7 minute runs before bog out. all needle settings stock. i think i got a dud, gonna call hpi tommorrow. btw i never took the air filter off when running it, and i always make sure the motor is tightend up. back plate, hsn valve, cooling head, exhaust flange.