To inspect or replace the spark plug:
1. Pull on the spark plug boot to remove it (Fig. 19). Be care-
ful not to tear insulation or wire.
2. Remove the spark plug rubber boot and unscrew the spark
plug from the engine using the spark plug wrench provided.
TIP: There is limited space for the wrench to turn. Use both
rows of holes in the spark plug wrench to gain leverage to
loosen the plug.
3. Visually inspect the spark plug. If it is cracked or chipped,
or if the electrodes are worn or burned, discard it and re-
place with a new spark plug.
We recommend replacing with an Torch F7TC spark plug
(part no. DF430X-216), available for purchase at
wenproducts.com.
4. If 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.
5. Measure the plug gap with a spark plug gap gauge. The
gap should be 0.6 to 0.8 mm (0.024-0.031 in.) (Fig. 20).
Carefully adjust the gap if necessary.
6. Screw the spark plug back into the spark plug hole us-
ing the spark plug wrench. Do not over-tighten spark plug.
Recommended tightening of spark plug is ½ to ¾ of a turn
(15 ft-lb torque/20.33 Nm) after spark plug gasket contacts
spark plug hole.
7. Reinstall the spark plug boot over the spark plug.
SPARK PLUG MAINTENANCE
Refer to Recommended Maintenance Schedule for maintaining the spark plug.
The spark plug is important for proper engine operation. Check the spark plug regularly to maintain proper engine
operation. A good spark plug should be intact, free of deposits, and properly gapped.
MAINTENANCE
30
Fig. 19
Fig. 20
Cylinder
Assembly
Spark Plug
Boot
0.6 - 0.8 mm
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