Spark Plug Service - Honda HS521 Owner's Manual

SPARK PLUG SERVICE
Recommended spark plug: BPR5ES (NGK), WIGEPR-U (ND)
m If the engine has been running, the muffler will be very hot. Be
careful not to touch the muffler while it is hot.
To ensure proper engine operation, the spark plug must be properly gap-
ped and free of deposits.
1. Remove the spark plug cover then the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use the wrench supplied in the tool kit to remove the spark plug.
SPARK PLUG WRENCH
4. Inspect the spark plug. Discard it if the electrodes are worn or if the in-
sulator is cracked or chipped. If it is to be reused clean the electrode and
insulator with a wire brush.
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