Stihl MS 311 User Manual - Page 29
Leakage Test, Preparations - fuel mixture
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6.2 Leakage Test Defective oil seals and gaskets or cracks in castings are the usual causes of leaks. Such faults allow supplementary air to enter the engine and upset the fuel-air mixture. 6.2.1 Preparations 1 1 1 4903RA053 TG This makes adjustment of the prescribed idle speed difficult, if not impossible. Moreover, the transition from idle speed to part or full throttle is not smooth. Always perform the vacuum test first and then the pressure test. The engine can be checked thoroughly for leaks with the pump 0000 850 1300. 2 - Remove the shroud, b 6.4 - Pull off the boot and unscrew the spark plug. - Set the piston to top dead center. This can be checked through the spark plug hole. - Remove the decompression valve, b 6.9 0001RA083 TG - Pry out the plugs. - Do not refit old plugs, always fit new ones. : Loosen the screws (1). 1 0001RA085 TG : Fit the plug (1) 1122 025 2200 and tighten it down firmly. : Fit the spark plug (2) and tighten it down firmly. : Fit the sealing plate (1) 0000 855 8107 between the cylinder exhaust port and muffler and tighten down the screws moderately. The sealing plate must completely fill the space between the two screws. - Remove the carburetor, b 12.5 28 MS 311, MS 391