Craftsman S145 Original Instructions Manual page 26

ADJUSTING THE IDLE SPEED
WARNING:
The saw chain may spin during idle speed
adjustments. Wear protective clothing and observe all
safety instructions to prevent serious personal injury.
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
Phillips screwdriver to turn the idle speed screw clockwise,
1/8 of a turn at a time, until the engine idles smoothly (Fig. 44).
• If the saw chain spins when the engine idles, reduce the idle
speed. Turn the idle speed screw counterclockwise, 1/8 of a
turn at a time, until the saw chain stops moving (Fig. 44).
MAINTAINING THE SPARK PLUG
1. Stop the engine and allow it to cool.
2. Turn the knob on the air filter cover counterclockwise to loosen
the air filter cover (Fig. 42).
3. Remove the air filter cover (Fig. 42).
4. Grasp the spark plug boot firmly and pull it from the spark plug
(Fig. 45).
5. Clean around the spark plug. Remove the spark plug from the
cylinder head with the multi-purpose tool or a 5/8-inch socket
wrench, turning counterclockwise.
WARNING:
Do not sand blast, scrape or clean spark plug
electrodes. Grit in the engine could damage the cylinder.
6. Inspect the spark plug. If the spark plug is cracked, fouled or
dirty, replace it with replacement part #794-00204, a Champion
RZ7C or an equivalent spark plug.
7. Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm)
(Fig. 46).
8. Install the spark plug in the cylinder head. Tighten the spark plug
with the multi-purpose tool or a 5/8-inch socket wrench, 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.
9. Reattach the spark plug boot.
10. Place the air filter cover back onto the unit. Insert the two tabs
on the air filter cover into the two slots on the chain saw housing
(Fig. 42).
11. Turn the knob clockwise to tighten the air filter cover securely.
Spark Plug Boot
0.025 in.
(0.635 mm)
26
Idle Speed Screw
Fig. 44
Fig. 45
Fig. 46