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1
MS 231, MS 231 C, MS 251, MS 251 C
q
© ANDREAS STIHL AG & Co. KG, 2010
RA_7
37_00_01_01
1.
Introduction and
Safety Precautions
3
1.1
Introduction
3
1.2
Safety Precautions
4
2.
Specifications
5
2.1
Engine
5
2.2
Fuel System
5
2.3
Ignition System
5
2.4
Chain Lubrication
5
2.5
Tightening Torques
6
3.
Troubleshooting
8
3.1
Clutch
8
3.2
Chain Drive,
Chain Brake,
Chain Tensioner
9
3.3
Chain Lubrication
11
3.4
Rewind Starter
12
3.5
Ignition System
14
3.6
Carburetor
15
3.7
Engine
18
4.
Clutch
19
4.1
Clutch Drum
19
4.2
Clutch
19
5.
Chain Brake
20
5.1
Checking Operation 20
5.2
Brake Band
20
5.3
Brake Lever
21
5.4
Brake Lever on
Machines with
QuickStop Super
24
5.4.1
Adjusting
the brake cable
26
5.4.2
Brake cable
Removing
and Installing
27
5.5
Chain Tensioner
29
5.5.1
Quick Chain
Tensioner
30
5.5.2
Chain Catcher
30
5.6
Bar Mounting Stud
31
6.
Engine
32
6.1
Muffler
32
6.2
Leakage Test
33
6.2.1
Preparations
33
6.2.2
Vacuum Test
34
6.2.3
Pressure Test
34
6.3
Oil Seals
35
6.3.1
Ignition side
35
6.3.2
Clutch side
36
6.4
Shroud
36
6.5
Engine
37
6.6
Cylinder / Crankshaft 38
6.7
Bearings / Crankshaft 41
6.8
Piston
42
6.9
Piston Rings
44
7.
Ignition System
45
7.1
Ignition Timing
45
7.2
Preseparator
45
7.3
Install new
ignition module
45
7.4
Testing the
Ignition Module
47
7.5
Spark Plug Boot /
Ignition Lead
48
7.6
Flywheel
49
7.7
Short Circuit Wire
50
7.7.1
Testing
50
7.7.2
Removing and
Installing
50
7.7.3
Ground Wire
53
7.7.4
Contact Spring
53
7.8
Ignition System
Troubleshooting
55
8.
Rewind Starter
58
8.1
General
58
8.2
Fan housing
58
8.3
Pawls
59
8.4
ErgoStart
60
8.5
Rope Rotor
61
8.6
Starter Rope / Grip
61
8.7
Tensioning
the Rewind Spring
62
8.8
Replacing
the Rewind Spring
63
9.
Servicing
the AV System
66
9.1
AV Spring on Oil Tank 66
9.2
AV Spring on
Fuel Tank
66
9.3
AV Spring on
Handlebar
67
9.3.1
Stop Buffers
68
9.3.2
Buffers on Filter Base 69
9.4
Handlebar
69
10.
Control Levers
71
10.1
Master Control Lever 71
10.1.1 Removing and
Installing
71
10.2
Throttle Trigger/
Lockout Lever
72
10.3
Throttle Trigger/
Lockout Lever –
QuickStop Super
73
10.3.1 Switch Lever
QuickStop Super
74
10.3.2 Lockout Lever –
QuickStop Super
75
10.3.3 Choke Rod
76
10.3.4 Throttle Rod
76
11.
Chain Lubrication
78
11.1
Pickup Body
78
11.2
Oil Suction Hose
78
11.3
Oil Pump
78
11.4
Valve
80
12.
Fuel System
81
12.1
Air Filter
81
12.2
Baffle
81
12.3
Filter Base
81
12.4
Air Guide Shroud
83
12.4.1 Air Guide Shroud –
Models with
Manual Fuel Pump
85
12.5
Carburetor
88
12.5.1 Leakage Test
89
Contents
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