Carburetor - Stihl MS 441 Manual

4.6

Carburetor

Condition
Carburetor floods; engine stalls
Poor acceleration
MS 441, MS 441 C
Cause
Inlet needle not sealing –
Impurities in valve seat or cone
Inlet control lever sticking on
spindle
Helical spring not located on nipple
of inlet control lever
Perforated disc on diaphragm is
deformed and presses constantly
against the inlet control lever
Setting of low speed screw
"too lean"
Setting of high speed screw
"too lean"
Inlet needle sticking in valve seat
Leak in diaphragm seal
Metering diaphragm damaged or
shrunk
Impulse hose damaged or kinked
Remedy
Remove and clean inlet needle or
clean carburetor
Restore easy movement of inlet
control lever
Remove inlet control lever and refit
it correctly
Fit a new metering diaphragm
Check basic carburetor setting,
correct if necessary
Check basic carburetor setting,
correct if necessary
Remove, clean and refit inlet
needle
Fit a new diaphragm seal
Fit a new metering diaphragm
Fit a new impulse hose
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