Stihl 026 Instruction Manual - Page 42

Use a screwdriver to remove the E-clip. •• Pull washer, spur sprocket and needle cage off the crankshaft. Clean the crankshaft stub and needle cage, and lubricate with STIHL grease (tube 0781 120 1111). Reassemble with new spur sprocket After fitting the clutch drum, rotate it about one turn to engage oil pump drive refit washer and E-clip on the crankshaft. Use only original STIHL chain sprockets to ensure correct operation of the chain brake. K 133BA022 KN Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware. The carburetor is set at the factory to guarantee an optimum fuel-air mixture under all operating conditions. Emissions at idling speed and part-load are kept to a minimum by reducing the idle mixture. • Check the air filter and clean or replace it if necessary. • Check the spark arresting screen and clean or replace it if necessary. Carefully screw the low speed screw down onto its seat. Now open it one turn counterclockwise (standard setting, ) • Warm up the engine. It is usually necessary to change the setting of the idle speed screw after every correction to the low speed screw . Turn screws only very slightly and carefully - even minor changes have a noticeable effect on the engine's running behavior. L LA Turn the idle speed screw clockwise until chain begins to run then back off the screw one quarter of a turn. Turn the idle speed screw counterclockwise until chain stops running then turn screw another quarter turn in the same direction.