MAINTENANCE
SPARK PLUG MAINTENANCE
Refer to Recommended Maintenance Schedule in Table 4 for maintaining the spark plug. The spark plug is impor-
tant 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.
To inspect or replace the spark plug:
1. Gently pull on the spark plug boot (Fig. 17 - 1) to remove it.
Be careful not to tear any insulation or wire.
2. Use the included spark plug socket (Fig. 18) to unscrew and
then carefully remove the spark plug from the engine.
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 replace
with a new spark plug.
We recommend replacing with a Torch F7TC (NGK BP7ES)
spark plug (part no. GN5600-121), 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 0.028 in. - 0.031 in. (0.7mm - 0.8mm) (Fig. 19).
Carefully adjust the gap if necessary.
6. Screw the spark plug back into the spark plug hole using
the spark plug wrench. Do not over-tighten spark plug. Rec-
ommended tightening of spark plug is 20 - 22 ft-lbs (27 - 30
Nm).
7. Reinstall the spark plug boot, spark plug rubber cover, and
service panel.
0.7 mm - 0.8 mm
Fig. 17
Fig. 18
Fig. 19
1
Spark Plug Socket
28
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