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REPLACING THE SPARK PLUG
Use a replacement 791-180852B spark plug. The correct air
gap is 0.025 in. (0.635 mm.). Remove the plug after every 25
hours of operation and check its condition.
1. Stop the engine and allow it to cool. Grasp the plug wire
firmly and pull the cap from the spark plug.
2. Clean dirt from around the spark plug. Remove the spark
plug from the cylinder head by turning it counterclockwise
with a 5/8” socket.
3. Replace cracked, fouled or dirty spark plug. Set the air gap at
0.025 in. (0.635 mm.) using a feeler gauge (Fig. 23).
4. Install a correctly-gapped spark plug in the cylinder head.
Turn the 5/8 in. socket clockwise until snug.
If using a torque wrench torque to:
110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.