Stihl FS 50 User Manual

19Series 4144 Powerhead
: Take out the screws (arrow)
together with the connector tag.
– Remove the spacer flange (1).
– Remove the gasket (1)
– always install a new gasket
: Inspect and clean the sealing
faces (arrows) and remove any
gasket residue, b 9
– Check the sealing faces on the
cylinder intake and exhaust ports.
938RA038 TG
1
545RA207 TG
1
938RA039 TG
The sealing faces must be in perfect
condition. If the sealing faces are
damaged, install a new cylinder or
spacer flange.
– Inspect the piston and piston
rings and replace if necessary,
b 6.7
: Slide the wooden assembly block
(1) 1108 893 4800 between the
piston and crankcase.
– Lubricate the piston, piston ring
and cylinder wall with oil, b 9
: Use the clamping strap (1)
0000 893 2600 to compress the
ring around the piston.
938RA040 TG
1
938RA041 TG
1
– Check correct installed position
of ring, b 6.7.1
Apply the clamping strap (1) so that
the piston ring does not project
beyond the cylinder wall.
: Align the cylinder so that the
recess in the cylinder engages
the projection on the crankcase
(arrows).
Take care not to damage the
cylinder gasket.
While sliding the cylinder over the
piston, hold the clamping strap
tightly around the piston so that the
ring does not project
– it might otherwise break.
: Slide the cylinder over the piston,
the clamping strap moves
downwards at the same time.
296RA046 TG938RA042 TG

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