Transmission / Gearbox tranny Remove the two bolts that

Remove the two bolts that hold the old clutch on to the engine

Sometimes the spring in the clutch breaks

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

or gear box for 40cc 4-stroke motors

make sure you look carefully inside the engine cavity to make sure there are no pieces of the clutch spring remaining

Transmission / Gearbox tranny Remove the two bolts thatTransmission, 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