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21
MAINTAINING THE SPARK PLUG
1. Stop the engine and allow it to cool. Grasp the spark plug boot
firmly 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 replacement part #753-05784, a Champion
RDZ4H or an equivalent spark plug.
4. Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm)
(Fig. 35).
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.
WARNING:
Do not sand blast, scrape or clean spark plug
electrodes. Grit in the engine could damage the cylinder.
ADJUSTING THE IDLE SPEED
If the engine will not idle properly:
1. Start the engine. Refer to Starting and Stopping.
2
. Release the throttle control and let the engine idle.
• If the engine stops, increase the idle speed. Use a small
P
hillips screwdriver to turn the idle speed screw clockwise,
1/8 of a turn at a time, until the engine idles smoothly (Fig. 34).
• If the cutting head spins when the engine idles, reduce the idle
speed. Turn the idle speed screw counterclockwise, 1/8 of a
t
urn at a time, until the cutting head stops moving (Fig. 34).
WARNING:
The cutting head may spin during idle speed
adjustments. Wear protective clothing and observe all
safety instructions to prevent serious personal injury.
Fig. 34
Idle Speed Screw
Fig. 35
0.025 in.
(0.635 mm)
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