Honda WB20T Owner's Manual page 23

3. Spark plug service
Recommended spark plug: BP4HS-10 (NGK)
To ensure proper engine operation, the spark plug must be properly gap-
ped and free of deposits.
1. Remove the spark plug.
m
If the engine has be& running, the muffler will be very hot. Be
careful not to touch the muffler.
SPARK
PLUG WRENCH
2.
3.
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.
Measure the plug gap with a feeler gauge. The gap should be 0.9- 1 .O
mm (0.035-0.039 in). Correct as necessary by bending the side
electrode.
~
0.9- 1 .O mm
(0.035-0.039 in)
21