Stihl MS 341 Shop Manual page 14

4.5 Carburetor
Condition
Carburetor floods;
engine stalls
Poor acceleration
MS 341, MS 361, MS 361 C
Cause
Inlet needle not sealing. Foreign
matter in valve seat or cone
damaged
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
Inlet control lever too high
(relative to correct installed
position)
Idle jet too lean
Main jet too lean
Inlet control lever too low
(relative to correct installed
position)
Inlet needle sticking to valve seat
Diaphragm gasket leaking
Metering diaphragm damaged or
shrunk
Impulse hose damaged or kinked
Remedy
Remove and clean or replace the
inlet needle, clean the fuel tank,
pickup body and fuel line if
necessary
Free off inlet control lever
Remove the inlet control lever and
refit it correctly
Fit a new metering diaphragm
Set inlet control lever flush with top
edge of housing
Rotate low speed screw (L)
counterclockwise (richer), no
further than stop
Rotate high speed screw (H)
counterclockwise (richer), no
further than stop
Set inlet control lever flush with top
edge of housing
Remove inlet needle, clean and
refit
Fit new diaphragm gasket
Fit new metering diaphragm
Fit new impulse hose
13