86
MS 271 C, MS 291 C
12.6
Servicing the Carburetor
12.6.1 Metering Diaphragm
– Troubleshooting,
– Remove the carburetor,
b
12.5
:
Take out the screws (arrows).
:
Remove the end cover (1).
If the gasket and diaphragm are
stuck to the carburetor, remove
them very carefully.
:
Carefully separate the metering
diaphragm (1) and gasket (2).
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.
– Check the metering diaphragm
for signs of damage and wear.
Install a new gasket.
5902RA381 TG
1
5902RA382 TG
1
2
Installing
– Note installed positions of
metering diaphragm (2) and
gasket (1).
:
Position the gasket (1) and
metering diaphragm (2) so that
the holes (arrows) are in line with
the recess (3).
:
Position the end cover (1) so that
the stub (3) points in the direction
of the choke shutter.
:
Fit the end cover (1) and line up
the holes.
:
Fit the screws (2).
– Check position of metering
diaphragm and gasket, then
tighten down the screws firmly in
a crosswise pattern.
:
Check the sealing ring (arrow)
and replace it if necessary
5902RA383 TG
1
2
3
2710RA334 TG
2 1
2
3
2
– Reassemble all other parts in the
reverse sequence.
12.6.2 Inlet Needle
– Remove the metering
diaphragm,
b
12.6.1
:
Take out the screw (1).
:
Remove the inlet control lever (2)
with
spindle (3) out of the inlet
needle’s groove.
The small spring under the inlet
control lever may pop out.
:
Remove the inlet needle (1).
:
Remove the spring (2). Inspect
and replace if necessary.
2710RA335 TG
1 2
3
5902RA388 TG
1
2
