* The spark plug may be fouled. A fouled spark plug can prevent the engine from getting the spark it needs to ignite the fuel and air mixture. This can be caused by a buildup of carbon deposits on the spark plug, or by a damaged or worn-out spark plug.
* The spark plug wire may be damaged or disconnected. The spark plug wire carries the electrical current from the ignition coil to the spark plug. If the spark plug wire is damaged or disconnected, the engine will not be able to get the spark it needs to ignite the fuel and air mixture.
* The ignition coil may be faulty. The ignition coil is responsible for creating the electrical current that is sent to the spark plug. If the ignition coil is faulty, it will not be able to produce enough current to ignite the fuel and air mixture.
* The carburetor may be clogged. A clogged carburetor can prevent the engine from getting the fuel it needs to run. This can be caused by a buildup of dirt and debris in the carburetor, or by a damaged or worn-out carburetor.
If you have tried all of the above and the engine still does not turn over with the spark plug in, you may need to take it to a qualified repair technician.
