Owner's Manual

3. Spark plug service

Recommended spark plug: BMR-4A (NGK)

W14MR-U (ND)

To ensure proper engine operation, the spark plug must be properly gapped

and free of deposits.

1. Remove the spark plug cap.

B If the engine has been running, the muffler will be very hot. Be

careful not to touch the muffler.

2. Visually inspect the spark plug. Discard it if the insulator is cracked or

chipped. Clean the spark plug with a wire brush if it is to be reused.

3. Measure the plug gap with a feeler gauge. The gap should be 0.6-0.7 mm

(0.024-0.028 in). Correct as necessary by bending the side electrode.

OS-Q.7 mm

(0.024-0.028 in)

4. Thread the plug in by hand to prevent cross-threading.

5. After seating it by hand, tighten a new spark plug l/2 turn with the wrench

to compress the washer. If you are reusing a plug, it should only take l/B-

l/4 turn.

CAUTION: The spark plug must be securely tightened. An improperly tight-

ened plug can become very hot and possibly damage the engine. Never use a

spark plug with an improper heat range.