Stihl MS 650 User Manual

1MS 650, MS 660
q
© ANDREAS STIHL AG & Co. KG, 2007
Contents
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 Chain Lubrication 5
3.5 Tightening Torques 6
4. Troubleshooting
Chart 8
4.1 Clutch, Chain Drive,
Chain Brake,
Chain Tensioner 8
4.2 Rewind Starter 10
4.3 Chain Lubrication 11
4.4 Ignition System 12
4.5 Carburetor 14
4.6 Engine 17
5. Clutch, Chain Drive,
Chain Brake and
Chain Tensioner 18
5.1 Clutch Drum /
Chain Sprocket 18
5.2 Replacing the
Chain Catcher 19
5.3 Spiked Bumper 19
5.4 Clutch 20
5.5 Chain Brake 22
5.5.1 Checking Operation 22
5.5.2 Removing 22
5.5.3 Installing 24
5.6 Chain Tensioner 27
5.7 Bar Mounting Studs 28
6. Engine 28
6.1 Muffler/Spark Arresting
Screen 28
6.2 Shroud 29
6.3 Leakage Test 30
6.3.1 Preparations 30
6.3.2 Vacuum Test 31
6.3.3 Pressure Test 32
6.4 Oil Seals 32
6.5 Cylinder and Piston 34
6.5.1 Removing 34
6.5.2 Installing 36
6.6 Piston Rings 39
6.7 Crankcase/
Crankshaft 40
6.7.1 Removing the
Crankshaft 40
6.7.2 Installing the
Crankshaft 43
6.8 Decompression Valve 47
7. Ignition System 48
7.1 Ignition Module 48
7.2 Ignition Timing 48
7.2.1 Removing and
Installing 49
7.2.2 Testing the
Ignition Module 50
7.2.3 Spark Plug Boot/
Ignition Lead 51
7.3 Flywheel 52
7.3.1 Removing 52
7.3.2 Installing 53
7.4 Contact Spring 53
7.5 Testing
Wiring Harness 54
7.6 Ignition System
Troubleshooting 55
8. Rewind Starter 58
8.1 General 58
8.2 Removing and
Installing 58
8.3 Pawls 58
8.4 Rope Rotor 59
8.5 Starter Rope / Grip 59
8.6 Tensioning
the Rewind Spring 60
8.7 Segment 61
8.8 Starter Rope Guide
Bushing 61
8.9 Replacing the
Rewind Spring 62
9. AV System 63
9.1 Annular Buffers between
Crankcase and
Tank Housing 63
9.2 Annular Buffer at top
of Tank Housing 64
10. Master Control /
Handle System 65
10.1 Switch Shaft 65
10.2 Throttle Trigger /
Interlock Lever 66
10.3 Front Handle 67
11. Chain Lubrication 68
11.1 Pickup Body /
Suction Hose 68
11.2 Valve 69
11.2.1 Cleaning 69
11.2.2 Replacing 69
11.3 Oil Pump 70
11.3.1 Removing and
Installing 70
11.3.2 Servicing 71
12. Fuel System 71
12.1 Air Filter 71
12.2 Carburetor 72
12.2.1 Removing and
Installing 72
12.2.2 Leakage Test 74
12.3 Servicing the
Carburetor 74
12.3.1 Metering Diaphragm 74
12.3.2 Inlet Needle 75
12.3.3 Fixed Jet 76
12.3.4 Pump Diaphragm 76
12.3.5 Removing and Installing
the Throttle Shaft 77
12.3.6 Removing and Installing
the Choke Shaft 79

Stihl MS 650 Specifications

General

Brand	Stihl
Model	MS 650
Category	Chainsaw
Language	English