15MS 201, MS 201 C, MS 201 T, MS 201 TC
Condition Cause Remedy
Engine will not idle, idle speed too
high
Throttle shutter opened too wide by
idle speed screw (LA)
Reset idle speed screw (LA)
correctly
Oil seals/crankcase leaking Seal oil seals / crankcase, replace if
necessary
Throttle shutter does not close Install new carburetor
Engine stops while idling Idle jet bores
or ports blocked
Clean the carburetor
Setting of low speed screw (L) too
rich or too lean
Reset low speed screw (L) correctly
Setting of idle speed screw LA
incorrect – throttle shutter
completely closed
Reset idle speed screw (LA)
correctly
Tank vent faulty Fit new tank vent
Leak in fuel hose from tank to
carburetor
Seal connections or install new fuel
hose
Saw chain rotates at idle speed 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
Power tool smells of fuel or loses
fuel
Fuel hoses leaking or damaged Check fuel hoses, push fully onto
connectors or replace if necessary
Fuel tank damaged Install new fuel tank
Pump diaphragm, metering
diaphragm or diaphragm gasket
faulty
Replace pump diaphragm,
metering diaphragm or diaphragm
gasket
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