Operation Manual

4. Spark plug service

Recommended spark plug: BPRGES (NGK)

W20EPR-U (ND)

CAUTION: Never use a spark plug of incorrect heat range.

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

and free of deposits.

1. Remove the spark plug cap and use a spark plug wrench to remove the

plug.

m 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 0.7-0.8

mm (0.028-0.031 in). Correct as necessary by bending the side

electrode.

0.7 - 0.8 mm

IO.028 - 0.031 in)