If I'm not mistaken HPI is probaly gonna replace my piston/sleeve for free but I'm just seeing incase they dont. See everyone is saying the motor is weak and pointless to rebuild. I'm 16, have to spend money on split tail left and right, gas, and then i can't get a job for nothing. So this is my cheaper project. I'm not a serious racer or anything I'm just having some fun. I plan on buying another engine sometime in the future but not now just can't afford it. Anyway HPI wants 48 bucks for piston/sleeve i think. If u know where i can get it cheaper please tell me