Stihl MS 880 MAGNUM Product Instruction Manual - Page 40
Adjusting the Carburetor
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English Adjusting the Carburetor Basic information The carburetor comes from the factory with a standard setting. The carburetor has been adjusted for optimum performance and fuel efficiency in all operating states. The adjusting screws on this carburetor can only be set within narrow limits. Standard setting H 1/2 L 1/4 HL N Switch off engine N Check the air filter - clean or replace it if necessary. N Check the spark arresting screen in the muffler (present only in some countries) - clean or replace it if necessary. N Turn the high speed screw (H) counterclockwise as far as possible (max. 1/2 turn) N Turn the low speed screw (L) clockwise - as far as possible - then back off 1/4 turn. 171BA019 KN 171BA020 KN 171BA020 KN Setting the idle speed H LA 1/2 L 1/4 L Engine stops when idling N Set the low speed screw (L) so that it is 1/4 turn open. N Turn the idle speed adjusting screw (LA) clockwise until the saw chain begins to run - then turn it back 1/4 turn. Saw chain rotates at idle speed N Set the low speed screw (L) so that it is 1/4 turn open. N Turn the idle speed screw (LA) counterclockwise until the chain stops running - then turn another 1/4 turn in the same direction. If the saw chain continues to keep rotating in idle even after adjustment, have it checked by a servicing dealer. Speed erratic when idling; poor acceleration (despite low speed screw = 1/4) H LA 1/2 L 1/4 L Idle setting is too lean - N Turn the low speed screw (L) counterclockwise until the engine runs and accelerates smoothly - but no further than the stop Whenever the low speed screw (L) has been adjusted, at least one adjustment must also be made on the idle speed adjusting screw (LA). Correcting the carburetor setting for use at high altitudes The setting may have to be marginally corrected if engine performance is unsatisfactory at high altitudes. N Check the standard setting N Let the engine warm up N Turn the high speed screw (H) clockwise (leaner) - max. up to the stop If you make the setting too lean it will increase the risk of engine damage through lack of lubrication and overheating. 38 MS 880