12 BT 130
3.6 Carburetor
3.7
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 metering
diaphragm is deformed and
presses constantly against the inlet
control lever
Fit new metering diaphragm
Metered diaphragm deformed Fit new metering diaphragm
Poor acceleration Setting of low speed screw or high
speed screw too lean
Check basic setting, correct if
necessary
Inlet needle sticking to valve seat Check and clean the inlet needle or
replace if necessary
Metering diaphragm damaged or
shrunk
Fit new metering diaphragm
Impulse hose kinked or damaged Position impulse hose without kinks
or replace if necessary
Tank vent faulty Fit new tank vent
Leak in fuel suction hose between
tank and carburetor
Install a new fuel suction hose
Jets or ports dirty or blocked Clean the carburetor
Replace sealing ring and/or spring
in accelerator pump
Replace accelerator pump in
carburetor
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