Operation Manual

15MS 241 C
3.6 Carburetor
Problem Cause Remedy
Carburetor floods; engine stalls Inlet needle not sealing
– Foreign matter in valve seat or
cone
Remove and clean inlet needle or
clean carburetor
Inlet needle worn Replace inlet needle
Inlet control lever sticking on
spindle
Examine 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
Replace metering diaphragm
Metering diaphragm is deformed Replace metering diaphragm
Poor acceleration Carburetor setting too lean Check M-Tronic
Carburetor setting too rich Check M-Tronic
Inlet needle sticking to valve seat Remove inlet needle, clean and
refit
Diaphragm gasket leaking Replace diaphragm gasket
Metering diaphragm damaged or
shrunk
Replace metering diaphragm
Tank vent faulty Replace tank vent
Leak in fuel line between tank and
carburetor
Seal connections or replace line