Transmission / Gearbox tranny Do not even think about

Do not even think about putting anywhere close to 60 psi into the tires

the pressure ratings on the sidewall of Chinese mini dirt bike tires are incorrect

The bike is not starting at all

or gear box for 40cc 4-stroke motors

Transmission / Gearbox tranny Do not even think aboutTransmission, or gear box for 40cc 4 stroke motors. Comes with the stock 11 tooth pinion gear attached. Typical symptoms that indicate a gearbox: Your bike started making a terrible rattling noise in the engine. Rear wheel is locked up, when pulling on the pull start the back wheel immediately starts spinning. To replace the gearbox, you have to remove the four screws that hold the transmission housing on to the engine. Use an 8mm socket wrench to