Stihl MS 341

Online version - not for reprint
77MS 341, MS 361, MS 361 C
– Push the fuel line with nipple onto
the carburetor’s elbow connector.
: Close the vent screw (1) on the
rubber bulb (2) and pump air into
the carburetor until the pressure
gauge (3) shows a reading of
approx. 0.8 bar (80 kPa).
VA
249RA012
2
1
3
If this pressure remains constant,
the carburetor is airtight. However, if
it drops, there are two possible
causes:
1. The inlet needle is not sealing
(foreign matter in valve seat or
sealing cone of inlet needle is
damaged or inlet control lever
sticking). Remove to clean –
b 12.3.2
2. Metering diaphragm damaged,
replace if necessary – b 12.3.1
– After completing the test, open
the vent screw (1) and pull the
fuel line off the carburetor.
– Push the fuel hose onto the
elbow connector.
– Install the carburetor – b 12.2.1
Reassemble all other parts in the
reverse sequence.
– Remove the carburetor –
b 12.2.1
: Take out the screws (arrows).
: Remove the end cover (1).
VA
212RA158
1
: Remove the metering diaphragm
and gasket (arrow) from the
carburetor body or end cover.
VA
212RA159
: Carefully separate the diaphragm
and gasket.
If the gasket and diaphragm are
stuck to the carburetor, remove
them very carefully.
VA
176RA272
The diaphragm material is
subjected to continuous alternating
stresses and eventually shows
signs of fatigue, i.e. the diaphragm
distorts and swells and has to be
replaced.
Reassemble in the reverse
sequence.
: Place the gasket on the
carburetor body so that the tab
(arrow) points towards the
adjusting screws.
VA
212RA160
12.3 Servicing the Carburetor
12.3.1 Metering Diaphragm