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100647 - ChAiNSAw
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. 41).
3. Remove the air filter cover (Fig. 41).
4. Grasp the spark plug boot firmly and pull it from the spark
plug (Fig. 44).
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.
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 a Champion RCJ7Y or Bosch L8RTF
Spark Plug
7. Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm)
(Fig. 45).
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.
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 tab on
the air filter cover into the slot on the chain saw housing
(Fig. 41).
11. Turn the knob clockwise to tighten the air filter cover
securely.
Spark plug boot
Figure 44
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NOTiCE
0.025 in.
(0.635 mm)
Figure 45
Cleaning
To avoid serious personal injury, always stop the engine and
allow it to cool before cleaning or maintaining the unit.
1. Loosen the saw chain if the chain tension was adjusted
during operation. The saw chain will contract as the unit
cools, which could damage the unit if the chain is too tight.
2. Clean the unit with a damp cloth. Do not douse the unit with
water. Do not use strong detergents. Household cleaners that
contain aromatic oils such as pine and lemon, and solvents
such as kerosene, can damage plastic.
When preparing the unit for long-term storage (30 days or
more), remove the guide bar and saw chain. Carefully clean
the guide bar cover, guide bar mounting surface and sprocket.
Use a firm non-wire brush to clean the guide bar groove.
Reassemble the unit.
3. Wipe off any moisture with a soft cloth.
4. Use compressed air, up to 40 PSI, to blow debris from the
cylinder fins (Fig. 46). The cylinder fins must be cleaned on a
regular basis to reduce the risk of personal injury or damage
to the unit as a result of fire. Always use safety goggles/
glasses when using compressed air. Do not use water or
other liquids to clean the cylinder fins. Use a small wire brush
to remove stubborn debris. If a significant amount of debris
remains, have the unit cleaned by Champion or other qualified
service dealer
5. Lightly coat the guide bar and saw chain with a corrosion-
inhibiting oil.
Cylinder fins
Figure 46
MAiNTENANCE
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29
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