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Stihl
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MS 390
Stihl MS 390 User Manual
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ST
I
H)
STIHL MS 290, 310, 390
2004-1
1
2
Table of Contents
Default Chapter
2
Table of Contents
2
1 Introduction
3
2 Safety Precautions
4
3 Specifications
5
Engine
5
Engine (USA Only)
5
Fuel System
6
Ignition System
6
Chain Lubrication
6
Tightening Torques
7
4 Troubleshooting Chart
8
Clutch, Chain Drive
8
Chain Brake
8
Chain Tensioner
8
Rewind Starter
9
Chain Lubrication
10
Ignition System
11
Carburetor
12
Engine
14
5 Clutch, Chain Drive, Chain Brake and Chain Tensioner
15
Clutch Drum/Chain
15
Sprocket
15
Chain Catcher
16
Spiked Bumper
16
Collar Stud
17
Clutch
17
Chain Brake
19
Checking Operation
19
Removing and 9. Installing
19
Replacing Pins
22
Removing
22
Installing
23
Chain Tensioner
24
6 Engine
24
Muffler/Spark
24
Arresting Screen
24
Leakage Test
26
Preparations
26
Pressure Test
27
Vacuum Test
27
Oil Seals
28
Shroud
30
Removing and Installing the Engine
31
Cylinder
32
Piston
34
Piston Rings
36
Crankshaft
36
7 Ignition System
37
Ignition Module
38
Ignition Timing
38
Removing and Installing
38
Testing the Ignition Module
40
Spark Plug Boot
41
Ignition Lead
42
Flywheel
43
Contact Spring
44
Replacing Wiring Harness
44
Ignition System Troubleshooting
46
8 Rewind Starter
49
General
49
Removing and Installing
49
Pawl
49
Rope Rotor
50
Starter Rope/Grip
50
Tensioning
52
Starter Rope Guide Bushing
53
Replacing Rewind Spring
53
AV Handle System/Handle Housing
54
Front Handle
54
Handle Housing
55
Annular Buffers
57
9 AV Handle System/
54
Front Handle/Handle Housing
57
Handle Housing/Engine Housing
57
Front Handle/Engine Housing
58
Switch Shaft
59
Throttle Trigger/Interlock Lever
60
10 Chain Lubrication
61
Pickup Body
61
Suction Hose
61
Valve
62
Tank Cap
63
Oil Pump
63
Removing and Installing
63
Servicing
64
11 Fuel System
65
Air Filter
65
Carburetor
66
Removing and Installing
66
Leakage Test
67
Servicing the Carburetor
68
Metering Diaphragm
68
Inlet Needle
69
Fixed Jet
70
Pump Diaphragm
70
Adjusting Carburetor
72
User Adjustment (Carburetor Without Limiter Caps)
72
User Adjustment (Carburetor with Limiter Caps)
73
Basic Setting (Carburetor with Limiter Caps)
74
Tank Vent
75
Machines up to 2002
75
Machines from 2002
76
Fuel Tank
77
Pickup Body
77
Suction Hose
77
Tank Cap
78
Replacing Engine Housing
78
12 Special Servicing Tools
80
13 Servicing Aids
82
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Instruction Manual
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Stihl MS 390 Specifications
General
Engine Displacement
64.1 cc
Chain Pitch
3/8"
Weight
6.2 kg
Guide Bar Lengths
40 to 50 cm
Fuel Capacity
0.68 l (23.0 oz)
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