Honda Power Products HSS970 Manuel De L'utilisateur page 61

Spark plug checking and adjustment −
The spark plug must be periodically checked and adjusted to provide
reliable ignition.
INTERVAL AT WHICH THE SPARK PLUG MUST BE CHECKED:
Every year, before operation.
CLEANING PROCEDURE:
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
gapped and free of deposits.
1. Remove 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.
4. Inspect the spark plug. Replace it if the electrodes are worn or if the
insulator is cracked or chipped. If it is to be reused, clean the
electrode and insulator with a wire brush.
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SPARK PLUG WRENCH