Stihl FS 80 Service Manual

44 FC 75, FC 85, FH 75, FS 75, FS 80, FS 85, HL 75, KM 85, KW 85
If this pressure remains constant,
the carburetor is airtight. However, if
it drops, there are two possible
causes:
The inlet needle is not sealing
(foreign matter in valve seat or
sealing cone of inlet needle is
damaged or the inlet control lever
is sticking).
Metering diaphragm is damaged.
In either of these cases the
carburetor has to be serviced,
b 9.3
After completing the test, open the
vent screw and pull the fuel hose off
the carburetor.
– Push the fuel hose onto the
carburetor’s elbow connector.
– Fit the shroud, b 5.1
– Remove the shroud, b 5.1.
: Disconnect throttle cable nipple
(1) from slotted pin (2) on
carburetor’s throttle lever.
VA
936RA164
1
2
: Disconnect the fuel hose (1) from
the fuel pump flange.
: Disconnect the fuel hose (2) from
the carburetor.
VA
936RA165
1
2
– Remove the air filter, b 9.1
: Unscrew the nuts (arrows).
– Remove the filter housing.
VA
936RA166
: Remove the heat shield (note its
installed position).
VA
936RA167
TOP
: Pull the carburetor off the screws.
VA
936RA168
9.2.2 Removing and Installing

Stihl FS 80 Specifications

General

Engine Type	2-stroke
Displacement	25.4 cc
Cutting Diameter	420 mm
Shaft Type	Straight
Starter	Recoil
Sound Power Level	106 dB(A)
Fuel Capacity	0.44 liters
Vibration Level	4.5 m/s²