Stihl FS 56 RC-E Product Instruction Manual - Page 35

Adjusting the Carburetor The carburetor comes from the factory with a standard setting. This setting provides an optimum fuel-air mixture under most operating conditions. With this carburetor it is only possible to make corrections with the adjusting screws within fine limits. Standard Setting N Shut odd the engine. N Mount a cutting tool - we recommend you use a mowing head. N Check the air filter and replace the element if necessary. N Have the spark arresting screen (not all markets) checked - see "Inspection and Maintenance by Dealer" N Turn the high speed screw (H) counterclockwise as far as stop (max. 3/4 turn possible). N Turn the low speed screw (L) counterclockwise as far as stop (max. 3/4 turn possible). 547BA024 KN N Start and warm up the engine if necessary. N Adjust idle speed with the idle speed screw (LA) so that the cutting tools does not turn. Fine Tuning for Operation in Mountains or at Sea Level A slight correction of the setting may be necessary if engine power is not satisfactory when operating at high altitude or at sea level. N Warm up the engine. At high altitude N Turn high speed screw (H) clockwise (leaner) - no further than stop. At sea level N Turn high speed screw (H) counterclockwise (richer) - no further than stop. Adjusting Idle Speed N Warm up the engine. Engine stops while idling N Turn the idle speed screw (LA) slowly clockwise until the engine runs smoothly - the cutting attachment must not turn. English Cutting attachment rotates when engine is idling N Turn the idle speed screw (LA) counterclockwise until the tool stops moving and then turn the screw another full turn in the same direction. If the cutting tool continues to rotate when the engine is idling, have your machine checked and repaired by your servicing dealer. Erratic idling behavior, engine stops even though setting of LA-screw has been corrected, poor acceleration Idle setting is too lean N Turn the low speed screw (L) counterclockwise, no further than stop, until the engine runs and accelerates smoothly. Erratic idling behavior, engine speed drops when swinging the machine Idle setting is too rich N Turn the low speed screw (L) clockwise (1/8 of a turn or 45° at a time) until the engine runs smoothly and accelerates well. It is usually necessary to change the setting of the idle speed screw (LA) after corrections to the low speed screw (L). FS 56, FS 56 R, FS 56 C, FS 56 RC 33