Ignition Coil Magneto (for 40cc 4-stroke engines) 4stroke One of the most popular

One of the most popular diaphragm carburetors

the nut from the gear box falls off

2-shoe engine clutch for 40cc 4-stroke motors

Sometimes the spring in the clutch breaks

Tail panel for the popular 40cc mini dirt bike

Ignition Coil Magneto (for 40cc 4-stroke engines) 4stroke One of the most popular2 shoe engine clutch for 40cc 4 stroke motors. Typical symptoms that indicate a bad coil: The bike is not starting at all. You took out the spark plug and checked for spark (properly grounding it while pulling), and there is no spark. You disconnected the kill switch to eliminate the possibility of a jammed kill switch button, and there is still no spark.