i just boutgh this and im only a week or two into the nitro hobby. i have no idea what kind of car this is. there is no name on it. but the motor says pro 21r from google im guessing its a hpi? could someone tell me what this car is if its worth fixing and what its worth. the guy i got it from said it ran when he put it up. i tried to crank it but something was making the pull start stick and the string popped.