Transmission / Gearbox tranny If you are not willing

If you are not willing to do

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You took out the spark plug and checked for spark (properly grounding it while pulling)

Transmission / Gearbox tranny If you are not willingTransmission, 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