Stihl 036 QS Instruction Manual - Page 41

Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburetion, ignition, timing and valve or port timing) without the addition of any major hardware. The carburetor is set at the factory to provide an optimum fuel-air mixture under all operating conditions. It enables your machine to run smoothly, be fuel efficient, operate reliably and produce low emissions. H 3/4 L 1/4 LA H L • Check the air filter and clean or • replace it if necessary Check the spark arresting screen and clean or replace it if necessary Turn the high speed adjusting H screw counterclockwise up to 3/4 the stop, i.e. 3/4 turn from max. lean setting Turn the low speed adjusting L screw clockwise up to the stop 1/4 - then back off the screw one quarter of a turn If the engine runs unsatisfactorily, slight readjustment may be necessary: Check standard setting •• warm up the engine Turn the high speed adjusting screw and low speed adjusting screw clockwise (leaner) - If you make the setting too lean, the maximum permissible engine speed will be exceeded - risk of engine damage. 138BA020 KN It is usually necessary to change the setting of the idle speed adjusting screw after every correction to the low speed adjusting screw . • Turn the idle speed adjusting screw clockwise until chain begins to run then back off the screw one quarter of a turn • Turn the idle speed adjusting screw counterclockwise until chain stops running then turn screw another quarter turn in the same direction Idle setting is too lean • Turn the low speed adjusting screw counterclockwise no further than stop until engine runs and accelerates smoothly -