Stihl BR 600 MAGNUM Product Instruction Manual - Page 25

Adjusting idle speed Engine stops while idling N Check the standard setting. N Turn the idle speed screw (LA) slowly clockwise until the engine runs smoothly. 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 Idle setting is too rich N Turn the low speed screw (L) clockwise, no further than stop, 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 for Operation in Mountains or at Sea Level At high altitude N Turn high speed screw (H) clockwise (leaner) - no further than stop. If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating. At sea level N Turn high speed screw (H) counterclockwise (richer) - no further than stop. Spark Plug English If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. Removing the Spark Plug 452BA092 KN 2 N Pull off the spark plug boot (1). N Unscrew the spark plug (2). 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 Check the standard setting. N Warm up the engine. BR 500, BR 550, BR 600 23