Product Instruction Manual
Page 50
...all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 If your daily working time is longer or operating conditions are difficult (very dusty... Cooling inlets Clean X Cylinder fins Clean X X Preseparator port and carburetor body Clean "Carb preheat" shutter and preheating port Clean (winter operation only) Carburetor Check idle adjustment - before...hours of operating, then every 150 hours Check X Chain catcher Replace Safety labels Replace 1) STIHL recommends a STIHL servicing dealer. 2) see chapter on "Chain Brake" 3) Firmly tighten down the cylinder base...
...all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 If your daily working time is longer or operating conditions are difficult (very dusty... Cooling inlets Clean X Cylinder fins Clean X X Preseparator port and carburetor body Clean "Carb preheat" shutter and preheating port Clean (winter operation only) Carburetor Check idle adjustment - before...hours of operating, then every 150 hours Check X Chain catcher Replace Safety labels Replace 1) STIHL recommends a STIHL servicing dealer. 2) see chapter on "Chain Brake" 3) Firmly tighten down the cylinder base...