Stihl FS 350 Instruction Manual - Page 34

256BA047 KN English / USA Winter Operation FS 400, 450, 480 256BA048 KN Adjusting Idle Speed Engine stops while idling : Carry out standard setting with the low speed screw (L). : Turn the idle speed screw (LA) clockwise until the engine runs smoothly - the cutting tool must not rotate. Cutting tool rotates when engine is idling : Turn the idle speed screw (LA) counterclockwise until the cutting tool stops rotating - then turn the screw about another half to one full turn in the same direction from that position. Erratic idling behavior, poor acceleration : Carry out standard setting with the low speed screw (L). Idle setting too lean: : Turn low speed screw (L) counterclockwise until the engine runs and accelerates smoothly. It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L). Fine tuning the carburetor for operation at high altitude A slight correction may be necessary if the engine does not run satisfactorily: : Check standard setting. : Warm up the engine. : Turn the high speed screw (H) clockwise (leaner). 3 1 2 3 2 1 Mount the "Intake Air Preheating" kit 4128 007 1001* to prevent the air filter and carburetor icing up at temperatures below +10°C/ +50°F and in powdery or drifting snow. : Remove the standard air filter (1). : Install the special filter (2) for winter operation. : Push cover (3) up against the underside of the filter cover. This is the winter position (upper illustration). FS 300, FS 350, FS 400, FS 450, FS 480 * see "Guide to Using this Manual" 33