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Stihl
Trimmer
FS 50
Stihl FS 50 Service Manual
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10
Series 4
144 Compone
nts FC, FS
, KM
Condit
ion
Cause
Remedy
No spark
Spark plu
g faulty
Install new spark plug
Faulty in
sulat
ion or shor
t in short
circuit wi
re
Check short ci
rcuit wire for short
circuit to ground
Break in ign
ition lead or insul
ation
damaged
Check ig
nition lead
, replace ign
ition
module i
f nece
ssary
Ignition mod
ule faulty
Instal
l new ignition module
10
12
Table of Contents
Contents
2
1. Introduction
3
2. Safety Precautions
4
3. Specifications
5
3.1 Engine
5
3.2 Fuel System
5
3.3 Ignition System
5
3.4 Tightening Torquese
6
4. Troubleshooting
8
4.1 Clutch
8
4.2 Rewind Starter
9
4.3 Ignition System
10
4.4 Carburetor
12
4.5 Engine
15
5. Engine
16
5.1 Removing and Installing
16
5.2 Leakage test
17
5.3 Oil seals
17
5.4 Ignition Module / Spark Plug Boot
17
5.5 Clutch
17
5.6 Flywheel
17
5.7 Motor
17
5.8 Muffler / Spark Arresting Screen
20
5.9 Short Circuit Wire
21
5.9.1 Testing
21
5.9.2 Removing and Installing (Loop Handle Version)
21
5.9.3 Removing and Installing (Bike Handle Version)
24
5.9.4 Ground Wire
27
5.10 Ignition System Troubleshooting
28
6. Rewind Starter
31
6.1 General
31
6.2 Removing and Installing
31
6.3 Pawls
31
6.3.1 Carrier
32
6.4 Rope Rotor
33
6.5 Starter Rope / Grip
34
6.6 Tensioning the Rewind Spring
36
6.7 Replacing the Rewind Spring
37
6.8 ErgoStart
37
7. Control Levers
38
7.1 Switch Shaft / Control Lever
38
7.2 Switch Positions
38
7.3 Interlock Lever (Loop Handle)
38
7.3.1 Throttle Trigger
39
7.4 Throttle Trigger/Interlock Lever (Bike Handle)
41
7.5 Handlebar (Bike Handle)
44
8. Fuel System
45
8.1 Air Filter
45
8.1.1 Baffle
45
8.1.2 Filter housing
45
8.2 Removing and Installing the Carburetor
46
8.3 Leakage Test
48
8.4 Servicing the Carburetor
48
8.4.1 Metering Diaphragm / Manual Fuel Pump
48
8.4.2 Inlet Needle
50
8.4.3 Pump Diaphragm
50
8.4.4 Throttle Lever / Rotary Knob
52
8.4.5 Adjusting Screws
53
8.5 Adjusting the Carburetor
55
8.5.1 Basic Setting
55
8.5.2 Standard Setting
56
8.6 Removing and Installing Throttle Cable (Loop Handle)
57
8.6.1 Removing and Installing Throttle Cable (Bike Handle)
59
8.6.2 Adjusting the Throttle Cable
59
8.7 Removing and Installing the Spacer Flange
60
8.8 Tank Vent
61
8.8.1 Testing
61
8.8.2 Removing and Installing
62
8.9 Fuel Intake
62
8.9.1 Pickup Body
62
8.9.2 Fuel Hoses
63
8.9.3 Fuel Tank Cap
64
8.10 Removing and Installing the Engine Housing
65
9. Drive Tube
66
9.1 Removing and Installing
66
9.1.1 Disassembling (KM 56)
67
9.1.2 Disassembling (FC 56)
69
9.1.3 Disassembling (FS 56)
70
9.1.4 Disassembling (FS 40, 50)
71
9.1.5 Removing and Installing the Bearing Housing
72
9.1.6 Loop Handle
73
9.1.7 Loop Handle with Barrier Bar
74
9.2 Add-On Components
75
9.2.1 Deflector for Machines without Gearbox
75
9.2.2 Deflector for Machines with Gearbox
75
9.2.3 One-part Carrying Ring
76
9.2.4 Retainer
76
9.3 Gearbox
76
10. Special Servicing Tools
77
11. Servicing Aids
78
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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
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