Stihl FS 50 Service Manual

50 Series 4144 Components FC, FS, KM
: Carefully remove the gasket with
pump diaphragm from the end
cover.
: Carefully separate the pump
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 pump diaphragm for
signs of damage and wear. Install
a new gasket.
– Check fuel strainer for
contamination and damage.
Clean or replace if necessary.
296RA247 TG296RA248 TG
2
1
: Use a needle to remove the fuel
strainer (1) from the carburetor
body.
– Reassemble in the reverse
sequence.
: Fit the gasket (1) so that the
contours (arrows) match and it is
held in position by the pegs (2).
: Fit the diaphragm on the gasket
(1) so that the contours (arrows)
match and it is held in position by
the pegs (2).
545RA195 TG
1
296RA250 TG
2
1
2
296RA251 TG
1
2
2
– Position the end cover (1) so that
the idle speed screw (arrow) is at
the same side as the adjusting
screws.
: Turn lever (2) on throttle shaft a
little and place the end cover (1)
against the carburetor body from
below so that the gasket and
pump diaphragm remain in
position on the end cover.
– Align the end cover (1) so that its
pegs engage the holes in the
carburetor body.
– Check that diaphragm and
gasket are properly seated.
: Tighten down the screw (1)
firmly.
– Tightening torques, b 3.4
– Reassemble all other parts in the
reverse sequence.
545RA196 TG
1
2
545RA197 TG
1

Stihl FS 50 Specifications

General

Engine Displacement	27.2 cc
Power Output	0.8 kW
Engine Type	2-stroke
Shaft Type	Straight
Starter System	Recoil
Overall Length	147 cm
Vibration Level	4.5 m/s²