Carburetor - Stihl MS 201 Manual

3.6

Carburetor

Condition
Carburetor floods; engine stalls
Poor acceleration
14
Cause
Inlet needle not sealing
– foreign matter in valve seat or
cone
Inlet needle worn
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
Metering diaphragm warped,
hardened or swollen
Setting of low speed screw (L) too
lean
Setting of high speed screw (H) too
lean
Inlet needle sticking to valve seat
Diaphragm gasket leaking
Metering diaphragm damaged,
hardened or swollen
Tank vent faulty
Leak in fuel hose from tank to
carburetor
Remedy
Remove and clean the inlet needle,
clean the carburetor
Fit new inlet needle
Check the inlet control lever and
replace if necessary
Remove the inlet control lever and
refit it correctly
Fit new metering diaphragm
Fit new metering diaphragm
Check basic setting, correct if
necessary
Check basic setting, correct if
necessary
Remove and clean inlet needle
Fit new diaphragm gasket
Fit new metering diaphragm
Fit new tank vent
Seal connections or install new fuel
hose
MS 201, MS 201 C, MS 201 T, MS 201 TC