Stihl FS 85 Service Manual

47FC 75, FC 85, FH 75, FS 75, FS 80, FS 85, HL 75, KM 85, KW 85
– Remove the shroud, b 5.1
– Carry out leakage test, b 9.2.1
: Take out the screws (1).
– Remove the end cover with cap.
VA
936RA023
1
: Take the cap out of the end cover.
VA
932RA285
: Remove the flange.
VA
936RA024
: Inspect the metering diaphragm
and gasket and replace if
necessary, b 9.3.3
Install in the reverse sequence.
VA
936RA025
– Remove flange secured with an
oval end cover, b 9.3.1
– Remove flange secured with a
square end cover, b 9.3.2
: Remove the metering
diaphragm (1) and gasket (2)
VA
936RA026
1
2
from the carburetor body.
If the gasket and diaphragm are
stuck together, remove and
separate them very carefully.
: Inspect the diaphragm and
gasket and replace if necessary.
The diaphragm is a very delicate
component. As a result of the
alternating stresses the material
eventually shows signs of fatigue,
i.e. the diaphragm distorts and
swells and has to be replaced.
Install in the reverse sequence.
9.3.2 Flange Mounting with Square End Cover 9.3.3 Metering Diaphragm

Stihl FS 85 Specifications

General

Engine Type	2-stroke
Displacement	25.4 cc
Weight	5.2 kg
Shaft Type	Straight
Starter	Recoil
Vibration Damping	Yes
Power Output	0.95 kW
Fuel Capacity	0.44 liters