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