Stihl MS 240

87MS 240, MS 260, MS 260 C
: Push the fuel hose with nipple
onto the carburetor’s fuel stub
(arrow).
– Push the pressure hose of pump
0000 850 1300 on to 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).
165RA337 TG
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165RA338 TG
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,
sealing cone of inlet needle
is damaged or
inlet control lever is sticking).
Remove to clean,
b 14.4.1
2. Metering diaphragm or gasket
damaged, replace if necessary,
b 14.4
3. Pump diaphragm or
gasket damaged, replace
if necessary, b 14.4.3
– After completing the test, push
the ring (1) to the left to vent the
system and then pull the fuel
hose off the carburetor.
– Install the carburetor, b 14.2
– Tightening torques, b 3.5
– Reassemble all other parts in the
reverse sequence.
14.4 Servicing the Carburetor
– Troubleshooting, b 4.6
– Remove the carburetor, b 14.2
– Disconnect the throttle rod,
b 14.6
: Take out the screws (arrows).
Versions with handle and
carburetor heating
: Remove the retainer (1) and
thermostatic switch (2).
165RA339 TG
165RA340 TG
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