Stihl MS 441 User Manual

1MS 441, MS 441 C
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© ANDREAS STIHL AG & Co. KG, 2006
Contents
1. Introduction 3
2. Safety 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 8
4.1 Clutch 8
4.2 Chain drive, chain brake,
chain tensioner 9
4.3 Chain lubrication 11
4.4 Rewind starter 12
4.5 Ignition system 13
4.6 Carburetor 15
4.7 Engine 18
5. Saw chain /
chain guide 19
6. Clutch 19
6.1 Clutch drum 21
7. Checking operation
of chain brake 23
7.1 Brake band, removal
and installation 23
7.2 Brake lever 25
7.3 QuickStop Super
brake lever 27
7.3.1 Adjusting brake cable 30
7.3.2 Brake cable, removal
and installation 31
7.4 Cam lever 33
7.5 Pins 34
7.6 Chain tensioner 35
7.7 Bar mounting studs 37
8. Engine 37
8.1 Muffler / spark
arresting screen 37
8.2 Leakage testing 39
8.2.1 Preparations 40
8.2.2 Vacuum test 41
8.2.3 Pressure test 41
8.3 Oil seals 42
8.4 Shroud, removal
and installation 44
8.5 Cylinder 45
8.6 Crankshaft 48
8.6.1 Removal 48
8.6.2 Installation 49
8.6.3 Ball bearing /
crankcase 52
8.7 Piston 54
8.7.1 Removal 54
8.7.2 Installation 55
8.8 Piston rings 56
8.9 Decompression valve 57
9. Ignition system 57
9.1 Ignition module 58
9.1.1 Removal and
installation 58
9.2 Ignition timing 60
9.3 Testing the ignition
module 60
9.4 Spark plug boot /
ignition lead 61
9.5 Flywheel 63
9.6 Short circuit wire 64
9.6.1 Testing 64
9.6.2 Removal and
installation 64
9.6.3 Ground wire 66
9.7 Pre-separator 67
9.8 Troubleshooting chart,
ignition system 69
10. Rewind starter 72
10.1 General 72
10.2 Removal and
installation 72
10.3 Pawls 73
10.4 Rope rotor 73
10.5 Starter rope / grip 74
10.6 Tensioning the rewind
spring 75
10.7 Rewind spring 76
10.8 Starter rope guide
bushing 77
11. Anti-vibration system,
repair 78
11.1 Annular buffers 78
11.2 Anti-vibration spring,
front handle 79
11.3 Anti-vibration spring,
fuel tank 79
11.3.1 Anti-vibration spring,
oil tank 80
11.4 Stop buffers 80
11.5 Front handle 81
11.5.1 Front handle with
handle heating 83
12. Actuating levers 84
12.1 Switch shaft 84
12.1.1 Removal and
installation 84
12.2 Throttle trigger / throttle
trigger interlock 85
12.3 Throttle trigger /
throttle trigger interlock /
QuickStop Super 87
12.3.1 Switch lever 89
12.3.2 Throttle trigger
interlock 90
13. Chain lubrication 91
13.1 Pick-up body 91
13.2 Oil suction hose 91
13.3 Oil pump 92
13.3.1 Repair 93
13.3.2 Adjustment 94
13.4 Valve 94
13.5 Oil tank cap 95

Stihl MS 441 Specifications

General

Displacement	70.7 cc
Weight	6.6 kg
Fuel Capacity	0.78 L
Chain Oil Capacity	0.36 l
Oil Capacity	0.36 l
Oil tank volume	0.36 l
Chain pitch	3/8"