Name: Stihl MS 181
Brand: Stihl
Rating: 5 (1 reviews)

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14 MS 171, MS 181, MS 211

4.6 Carburetor

Condition Cause Remedy

Carburetor floods;

engine stalls

Inlet needle not sealing. Foreign

matter between valve seat and

cone or cone worn

Remove and clean or replace the

inlet needle, clean the carburetor,

replace inlet needle if necessary

Inlet control lever sticking on

spindle

Clean inlet control lever, replace if

necessary

Helical spring not located on nipple

of inlet control lever

Remove the inlet control lever and

refit it correctly

Perforated disc on diaphragm is

deformed and presses constantly

against the inlet control lever

Fit a new metering diaphragm

Poor acceleration Setting of low speed screw too lean Check basic carburetor setting,

correct if necessary

High speed screw too rich Check basic carburetor setting,

correct if necessary

Inlet needle sticking to valve seat Remove inlet needle, clean and

refit

Diaphragm gasket leaking Fit new diaphragm gasket

Metering diaphragm damaged or

shrunk

Fit new metering diaphragm

Manifold damaged Install new manifold

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