Stihl MS 181 User Manual

1MS 171, MS 181, MS 211
q
© ANDREAS STIHL AG & Co. KG, 2007
RA_533_00_01_01
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 8
4.1 Clutch 8
4.2 Chain Drive,
Chain Brake,
Chain Tensioner 9
4.3 Chain Lubrication 10
4.4 Rewind Starter 11
4.5 Ignition System 12
4.6 Carburetor 14
4.7 Engine 17
5. Cutting Attachment 18
5.1 Chain Catcher 18
6. Clutch 19
6.1 Clutch Drum 21
7. Chain Brake 22
7.1 Checking Operation 22
7.2 Removing and
Installing
the Brake Band 22
7.3 Brake Lever 24
7.4 Flat Spring 26
7.5 Pins 26
7.6 Chain Tensioner 27
7.7 Bar Mounting Studs 27
8. Engine 28
8.1 Muffler / Spark
Arresting Screen 28
8.2 Leakage Test 29
8.2.1 Preparations 29
8.2.2 Vacuum Test 30
8.2.3 Pressure Test 30
8.3 Oil Seals 31
8.4 Removing and Installing
the Shroud 32
8.5 Removing and Installing
the Engine 33
8.6 Crankshaft 34
8.7 Ball Bearings/
Crankshaft 36
8.8 Piston 37
8.8.1 Piston Rings 39
9. Ignition System 40
9.1 Ignition Module 40
9.1.1 Removing and
Installing 40
9.2 Ignition Timing 42
9.3 Testing the Ignition
Module 42
9.4 Spark Plug Boot 43
9.5 Flywheel 44
9.6 Short Circuit Wire 45
9.6.1 Testing 45
9.6.2 Removing and
Installing 45
9.6.3 Ground Wire 47
9.6.4 Contact Spring 47
9.7 Ignition System
Troubleshooting 49
10. Rewind Starter 52
10.1 General 52
10.2 Removing and
Installing 52
10.3 Pawl 53
10.4 ErgoStart 53
10.5 Rope Rotor 55
10.6 Starter Rope / Grip 55
10.7 Tensioning
the Rewind Spring 57
10.8 Replacing
the Rewind Spring 58
11. Servicing
the AV System 60
11.1 AV Spring on Oil Tank 60
11.2 AV Spring on
Fuel Tank 60
11.3 AV Spring on
Cylinder 61
11.4 Handle Frame 62
12. Master Control Lever 64
12.1 Switch Shaft 64
12.1.1 Removing and
Installing 64
12.2 Throttle Trigger /
Interlock Lever 66
13. Chain Lubrication 68
13.1 Pickup Body 68
13.2 Oil Suction Hose 68
13.3 Removing and Installing
the Oil Pump 69
13.4 Valve 70
13.5 Oil Tank Cap 71
Contents
All manuals and user guides at all-guides.com

Stihl MS 181 Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	400 mm
Product color	Black, Grey, Orange
Chain tensioner	Yes
Motor speed (max)	10000 RPM
Fuel tank capacity	0.266 L
Engine displacement	31.8 cm³
Power source	Gasoline
Sound power level	112 dB
Vibration emission	3.5 m/s²
Sound pressure level	100 dB

Weight and Dimensions

Weight	43004300 g