MAINTENANCE
SPARK PLUG MAINTENANCE
Check the spark plug regularly for proper engine operation (refer to the Recommended Maintenance Schedule in
Fig. 9). A good spark plug should be intact, free of deposits, and properly gapped. To inspect the spark plug:
1. Pull on the spark plug cap to remove it. Be careful not to tear insulation or wire.
2. Unscrew the spark plug from the engine using the spark plug wrench provided. There is limited space for the
wrench to turn. Use both rows of holes in the spark plug wrench to gain leverage and loosen the plug.
3. Visually inspect the spark plug for cracks or excessive electrode wear. Replace as necessary.
4. Measure the plug gap with a spark plug gap gauge. The gap should be 0.7 to 0.8 mm (0.028-0.031 in.) (Fig. 16).
5. If you are re-using the spark plug, use a wire brush to clean any dirt from around the spark plug base then re-
gap the spark plug.
6. Screw the spark plug back into the spark plug hole using the spark plug wrench. Do not over-tighten the spark
plug. Recommended tightening is ½ to ¾ of a turn after the spark plug gasket contacts spark plug hole. Reinstall
the spark plug cap.
Plug
Wrench
Spark Plug
Cap
Spark Plug
Cylinder
Assembly
Fig. 14
Fig. 15
Fig. 16
22
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