Stihl MS 251 Instruction Manual - Page 17
Tank vent faulty, Replace tank vent - c chain
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Condition Cause Remedy Engine will not idle, idle speed too Throttle shutter opened too wide by Reset idle speed screw (LA) high idle speed screw (LA) correctly Oil seals/engine pan leaking Seal or replace oil seals/engine pan Throttle shutter does not close Install new carburetor Engine stops while idling Idle jet bores or ports blocked Low speed screw too rich or too lean Setting of idle speed screw LA incorrect - throttle shutter completely closed Tank vent faulty Clean the carburetor Reset low speed screw (L) correctly Reset idle speed screw (LA) correctly Replace tank vent Saw chain rotates at idle speed Leak on fuel hose from tank to carburetor Seal connections or install new fuel hose Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs 16 MS 231, MS 231 C, MS 251, MS 251 C