Stihl 056 Instruction Manual - Page 28

Carburetor 1 High speed adjustment screw 2 Low speed adjustment screw 3 Idle speed regulating screw Regulating the idle speed regulating screw The carburetor has been adjusted at the factory for maximum performance and lowest fuel consumption under local average atmospheric conditions. When working at high altitudes (mountains) or near sea level the carburetor must be readjusted. The adjustment must be made at the two adjustment screws and at the idle speed regulating screw. For the basic adjustment - it should be taken as a guide for all readjustments - both adjustment screws are screwed in carefully until they have a snug fit. Thereafter the following adjustments have to be made: High speed adjustment screw H: open 1114 of a turn Low speed adjustment screw L: open 1 of a turn Never interchange the adjustment screws! Carburetor adjustment must only be done while engine is 26 warm and with clean air filter. Hints for readjustment of the carburetor Engine stalls at idle speed: With engine running turn idle speed adjusting screw slighHy to the right - clockwise - (chain must not run). Chain runs when engine is idling: Turn idle speed adjustment screw slightly to the left anticlockwise. Engine speed erratic when idling: Adjust low speed adjustment screw. You get a leaner mixture by turning it to the right - clockwise - and a richer mixture by turning it anti-clockwise. Except for simple maintenance works repairs should be done by an authorized STIHL service shop. In many places you find service shops with al necessary tools and trained personell.