Product Manual

Refer to Recommended Maintenance Schedule in Fig. 9 for maintaining the spark plug.

The spark plug is important for proper engine operation. Check the spark plug regularly for proper engine

operation. A good spark plug should be intact, free of deposits, and properly gapped.

SPARK PLUG MAINTENANCE

MAINTENANCE

To inspect or replace the spark plug:

1. Pull on the spark plug boot to remove it. Be careful not to tear

any insulation or wire.

2. Use the included spark plug wrench to unscrew and carefully

remove the spark plug from the engine.

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 NGK BP5ES spark plug (Part No.

56105-069), 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 0.7 to 0.8 mm (0.028-0.031 in.) (Fig. 14). Carefully

adjust the gap if necessary.

6. Screw the spark plug back into the spark plug hole by hand.

After the spark plug is properly seated, use the spark plug

wrench to tighten it.

Do not over-tighten the spark plug.

NOTE: The spark plug torque is 9 - 12 N.m ( 7 - 8 ft.lb). The

spark plug should be tightened 1/2 to 3/4 turn after spark plug

gasket contacts spark plug hole.

7. Reinstall the spark plug boot over the spark plug.

Recommended Spark Plug:

NGK BP5ES, Torch F5TC or Similar

Fig. 13

Fig. 14