Product Manual

MAINTENANCE

SPARK PLUG MAINTENANCE

The spark plug is important for proper engine operation. A good

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

Refer to Recommended Maintenance Schedule in Table 4 for for

instructions on maintaining. To inspect the spark plug:

1. Open the spark plug access cover (Fig. 20 - 1).

2. Pull up to remove the black plastic spark plug boot. Be careful

not to tear any insulation or wire.

3. Use a spark plug wrench to unscrew and remove the spark plug

from the engine.

4. Visually inspect the spark plug for cracks or excessive electrode

wear. If the electrodes are worn or burned, or porcelain is cracked,

replace with a NGK BP5H/Torch E5T spark plug (Part No. 56202i-

102), available at wenproducts.com.

5. 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.

6. Measure the plug gap with a wire gauge (Fig. 21). The gap

should be 0.6 mm - 0.8 mm. Carefully adjust the gap if necessary.

7. 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.

NOTE: The recommended tightening of the spark plug is 1/2 to 3/4 of a turn after the spark plug gasket contacts the

spark plug hole, or 11.1-14.7 ft-lbs (15 - 20 Nm). Do not over-tighten the spark plug.

8. Reinstall the spark plug boot over the spark plug.

9. Reinstall the spark plug access cover.

0.6 mm - 0.8 mm

Fig. 20

Fig. 21