1. Remove the spark plug wire from the spark plug.
2. Hold the spark plug wire close to the spark plug.
3. Crank the engine.
4. If you see a spark, the spark plug is working.
5. If you do not see a spark, the spark plug is not working.
If the spark plug is not working
1. Replace the spark plug.
2. Check the spark plug wire.
3. Check the ignition coil.
If the spark plug is working
1. Check the fuel line.
2. Check the carburetor.
3. Check the air filter.