Poulan SM4018 User Manual - Page 14

Cleaning the air filter: A dirty air filter decreases engine performance and increases fuel consumption and harmful emissions. Always clean after 10 tanks of fuel or 5 hours of operation, which- ever comes first. Clean more frequently in dusty conditions. A used aire filter can never be completely cleaned. It is advisable to replace your air filter with a new one after every 50 hours of operation, or annually, whichever comes first. 1. Loosen 3 screws on cylinder cover. 2. Remove cylinder cover. 3. Remove air filter. 4. Clean the air filter using hot soapy water. Rinse with clean cool water. Air dry com- pletely before reinstalling. 5. Lightly oil air filter before installing to im- prove the efficiency of air filter. Use 2--cycle engine oil or motor oil (SAE 30). Squeeze excess oil from filter. 6. Reinstall air filter. 7. Reinstall cylinder cover and 3 screws. TIghten securely. Air Filter Cylinder Cover Screws Cylinder Cover 3. Loosen and remove the 2 muffler bolts. Remove the muffler, muffler gasket, out- let guide and backplate. Notice the orientation of these parts for reassembling. 4. Locate the 2 outlet cover screws on the muffler. Loosen and remove both screws. 5. Remove the outlet cover. Outlet Cover BACK VIEW OF MUFFLER Screws Muffler Spark Arresting Screen 6. Remove spark arresting screen. 7. Clean the spark arresting screen with a wire brush. Replace screen if any wires are broken or screen is blocked after cleaning. 8. Reinstall spark arresting screen. 9. Reinstall outlet cover and 2 screws. En- sure outlet cover and both screws are re- installed correctly (see illustrations) to prevent damage to the saw. The exhaust outlet must face the chain brake (bar side) of the saw. Exhaust Outlet Cover Outlet INSPECT MUFFLER AND SPARK ARRESTING SCREEN WARNING: The muffler on this product contains chemicals known to the State of California to cause cancer. As the unit is used, carbon deposits build up on the muffler and spark arresting screen, and must be removed to avoid creating a fire hazard or affecting engine performance. Replace the spark arresting screen if breaks occur. CLEANING THE SPARK ARRESTING SCREEN Cleaning is required every 25 hours of operation or annually, whichever comes first. Outlet Guide Muffler Backplate Muffler Gasket Bolt Cover Muffler Bolts Locknut 1. Loosen and remove the locknut from the bolt cover. 2. Remove the bolt cover. Exhaust Outlet must face chain brake (bar side) of chain saw 10. Inspect the muffler gasket and replace if damaged. 11. Reinstall backplate, outlet guide, muffler gasket, and muffler using muffler bolts. Tighten until secure. 12. Reinstall bolt cover and locknut. Tighten securely. CARBURETOR ADJUSTMENT WARNING: The chain will be mov- ing during most of this procedure. Wear your protective equipment and observe all safety precautions. The chain must not move at idle speed. The carburetor has been carefully set at the factory. Adjustments may be necessary if you notice any of the following conditions: S Chain moves at idle. See IDLE SPEED--T adjusting procedure. S Saw will not idle. See IDLE SPEED--T adjusting procedure. Idle Speed--T Allow engine to idle. If the chain moves, idle is too fast. If the engine stalls, idle is too slow. Adjust speed until engine runs without chain movement (idle too fast) or stalling (idle too slow). The idle speed screw is located in the area above the primer bulb and is labeled T. S Turn idle speed screw (T) clockwise to increase engine speed. 14