Stihl MS 461 R Product Instruction Manual - Page 34

Winter Operation English / USA Chain brake maintenance The chain brake is subject to normal wear. It is necessary to have it serviced 1 and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: 2 145BA040 KN 145BA041 KN Full-time professional users: Semi-professional users (in agriculture and construction): Hobby and occasional users: every 3 months every 6 months every 12 months At temperatures below +50 °F (+10 °C) preheat carburetor as follows: : Remove the carburetor box cover. Inside the carburetor box cover: : Move the shutter from summer position (1) to winter position (2). Heated air is now drawn in from around the cylinder and mixed with cold air - this helps prevent carburetror icing. : At temperatures above +68 °F (+20 °C): Return shutter to summer position. This is essential to avoid engine running problems and overheating Machines with HD Filter: : Install standard filter in place of the HD filter. : Refit the carburetor box cover and tighten down the twist lock. At temperatures below +14 °F (-10 °C) It is advisable to fit the cover plate (special accessory) on the fan cover in extremely cold conditions (temperatures below +14°F (-10°C), in powder or drifting snow). The cover plate partially blanks off the slots in the fan cover to help prevent snow being sucked into the machine. If engine idle speed is erratic or acceleration is poor : Turn low speed screw (L) 1/4 turn counterclockwise. It is usually necessary to change the setting of the idle speed screw (LA) after making adjustments to the the low speed screw (L) - see "Adjusting the Carburetor". MS 460, MS 460 R 33