74
MS 171, MS 181, MS 211
14.3.1 Leakage Test
In the case of problems with the
carburetor or fuel supply system,
also check and clean or replace the
tank vent,
b
14.8
The carburetor can be tested for
leaks with the pump 0000 850 1300.
– Remove the carburetor,
b
14.3
:
Push the fuel line (1)
1110 141 8600 onto the
nipple (2) 0000 855 9200.
:
Push the fuel line with nipple onto
the carburetor’s fuel stub (arrow).
VA
143RA172
2
1
533RA298 TG
– Push the pressure hose of pump
0000 850 1300 onto the nipple.
:
Push the ring (1) to the right and
pump air into the carburetor until
the pressure gauge (2) indicates
a pressure of about 0.8 bar
(80 kPa).
If this pressure remains constant,
the carburetor is airtight. However, if
it drops, there are three 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
14.4.2
2. Metering diaphragm or gasket
damaged, replace if necessary,
b
14.4.1
3. Pump diaphragm or gasket
damaged, replace if necessary,
b
14.4.5
– After completing the test, push
the ring (1) to the left to vent the
system and then pull the fuel line
off the carburetor.
– Install the carburetor,
b
14.3
– Reassemble all other parts in the
reverse sequence.
– Tightening torques,
b
3.5
533RA299 TG
1
2
14.4
Servicing the Carburetor
14.4.1 Metering Diaphragm
– Troubleshooting,
– Remove the carburetor,
b
14.3
:
Take out the screws (arrows).
:
Remove the end cover (1).
If the gasket and diaphragm are
stuck to the carburetor, remove
them very carefully..
533RA300 TG
1
533RA301 TG
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