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26
ENGLISH
MAINTENANCE - Continued
• USA: replacement part #753-06847, a
Champion RDJ7J or an equivalent
spark plug.
• Canada: replacement part #794-00097,
a Champion QDJ7J or an equivalent
spark plug.
4. Use a feeler gauge to set the air gap at 0.025
in. (0.635 mm) (Fig. 20).
5. Install the spark plug in the cylinder head.
Tighten the spark plug with a 5/8-inch
socket, turning it clockwise until snug.
NOTE: If using a torque wrench, torque to:
110-120 in.•lb. (12.3-13.5 N•m). Do
not over tighten.
6. Reattach the spark plug boot.
2. Release the throttle control and let the
engine idle.
• If the engine stops, increase the idle
speed. Use a small Phillips screwdriver
to turn the idle speed screw clockwise,
1/8 of a turn at a time, until the engine
idles smoothly (Fig. 19).
• If the blades move when the engine
idles, reduce the idle speed. Turn the
idle speed screw counterclockwise, 1/8
of a turn at a time, until the blades stop
moving (Fig. 19).
Fig. 19
Idle Speed Screw
Adjusting the Idle Speed
If the engine will not idle properly:
1. Start the engine. Refer to Starting and
Stopping.
WARNING: The blades may
move during idle speed adjustments.
Wear protective clothing and
observe all safety instructions to
prevent serious personal injury.
Maintaining the Spark Plug
1. Stop the engine and allow it to cool. Grasp
the spark plug boot rmly and pull it from
the spark plug.
2. Clean around the spark plug. Remove the
spark plug from the cylinder head with a
5/8-inch socket, turning counterclockwise.
3. Inspect the spark plug. If the spark plug is
cracked, fouled or dirty, replace it with:
WARNING: Do not sand blast,
scrape or clean spark plug
electrodes. Grit in the engine could
damage the cylinder.
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