Spark Plug: Testing and Inspection

Inspection

1. Remove the spark plug.
2. Connect the spark plug to the spark plug wire.





3. Hold the spark plug with insulated pliers 0.20-0.40 in (5-10 mm) from a ground.
4. Crank the engine and verify that there is a strong blue spark.

* NOTICE: If there is no spark, replace the spark plug.





5. Check the following points. If a problem is found, replace the spark plug.
a. Damaged insulation
b. Worn electrodes
c. Carbon deposits
If cleaning is necessary use a plug cleaner or a wire brush. Clean the upper insulator also.
d. Damaged sealing washer.
e. Burnt condition.

Plug gap: 0.039-0.043 in (1.0-1.1 mm)