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Condition
Engine will not idle,
idle speed too high
Engine stalls at idle speed
MS 171, MS 181, MS 211
All manuals and user guides at all-guides.com
Cause
Throttle shutter opened too wide by
idle speed screw (LA)
Oil seals/engine leaking
Air valve contaminated
– does not close
Air valve stiff
Throttle rod stiff
– throttle shutter does not close
Idle jet bores or ports blocked
Idle jet too rich or too lean
Setting of idle speed (LA)
incorrect – throttle shutter
completely closed
Remedy
Reset idle speed screw (LA)
correctly
Seal or replace oil seals/
engine
Clean air valve, replace if
necessary
Check air valve, replace if
necessary
Replace throttle rod and lever
Clean the carburetor
Set low speed screw (L)
correctly
Set idle speed screw (LA)
correctly
15
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