Stihl MS 461 Manual

1MS 461, MS 461-R
q
© ANDREAS STIHL AG & Co. KG, 2013
RA_773_00_01_02
1. Introduction and
Safety Precautions 3
1.1 Introduction 3
1.2 Safety Precautions 4
2. Specifications 5
2.1 Motor 5
2.2 Fuel System 5
2.3 Ignition System 5
2.4 Chain Lubrication 5
2.5 Tightening Torquese 6
3. Troubleshooting 8
3.1 Clutch 8
3.2 Chain Drive, Chain
Brake, Chain
Tensioner 9
3.3 Chain Lubrication 10
3.4 Rewind Starter 11
3.5 Ignition System 12
3.6 Carburetor 13
3.7 Engine 16
4. Clutch 17
4.1 Clutch Drum 17
4.2 Clutch 17
5. Chain Brake 19
5.1 Checking Operation 19
5.2 Brake Band 19
5.3 Brake Lever 20
5.4 Cam Lever 22
5.5 Pins 22
5.6 Chain Tensioner 23
5.7 Bar Mounting Studs 24
6. Engine 25
6.1 Muffler 25
6.2 Leakage Test 26
6.2.1 Preparations 26
6.2.2 Vacuum Test 27
6.2.3 Pressure Test 28
6.3 Oil Seals 28
6.4 Shroud 30
6.5 Cylinder 30
6.6 Crankshaft 33
6.6.1 Bearings / Crankcase 37
6.7 Piston 38
6.8 Piston Rings 39
6.9 Decompression Valve 40
7. Ignition System 41
7.1 Ignition Timing 41
7.2 Install new
ignition module 41
7.3 Testing the
Ignition Module 43
7.3.1 Testing Ignition Module
with MDG 1 Engine
Analyzer 43
7.4 Spark Plug Boot /
Ignition Lead 44
7.5 Flywheel 45
7.6 Wiring Harness 46
7.6.1 Testing 46
7.6.2 Ground Wire 46
7.6.3 Wiring Harness
Removing and
Installing 47
7.6.4 Wiring Harness
Removing and
Installing on Models
with Heating System 49
7.6.5 Contact Spring 53
7.7 Ignition System
Troubleshooting 54
8. Rewind Starter 57
8.1 General 57
8.2 Rewind Starter
Removing
and Installing 57
8.3 Pawls 57
8.4 Rope Rotor 58
8.5 Starter Rope / Grip 58
8.6 Tensioning
the Rewind Spring 59
8.7 Replacing
the Rewind Spring 60
9. AV Elements 61
9.1 Annular Buffer on
Fuel Tank /
Clutch Side 61
9.1.1 Annular Buffer on
Fuel Tank /
Ignition Side 61
9.1.2 Annular Buffer on
Spiked Bumper /
Clutch Side 62
9.1.3 Annular Buffer on
Oil Tank /
Ignition Side 63
9.1.4 Stop Buffer at
Clutch Side 64
9.1.5 Stop Buffer at
Ignition Side 64
9.2 Handlebar 64
9.2.1 Wrap Around
Handlebar on
Rescue Saw 65
9.2.2 Handlebar
with Heating 66
10. Control Levers 69
10.1 Master Control Lever 69
10.1.1 Removing and
Installing 69
10.2 Throttle Trigger /
Lockout Lever 70
10.3 Throttle Rod 71
10.3.1 Throttle Rod on
Models with Heating 72
11. Chain Lubrication 73
11.1 Pickup Body 73
11.2 Oil Suction Hose 73
11.3 Oil Pump 73
11.3.1 Adjusting Uprated
Oil Pumps 74
11.4 Valve 75
12. Fuel System 76
12.1 Air Filter 76
12.2 Baffle 76
12.3 Filter Base 76
12.4 Carburetor 77
12.4.1 Leakage Test 79
12.5 Servicing
the Carburetor 79
12.5.1 Metering Diaphragm 79
12.5.2 Inlet Needle 80
12.5.3 Pump Diaphragm 81
12.5.4 Adjusting Screws 82
12.6 Adjusting
the Carburetor 84
12.6.1 Basic Setting 84
12.6.2 Setting 85
12.6.3 Standard Setting 86
12.7 Intake Manifold 87
Contents

Stihl MS 461 Specifications

General

Motor type	2-stroke motor
Chain gauge	1.6 mm
Chain pitch	3/8 \
Automatic oiling	Yes
Oil tank capacity	0.325 L
Fuel tank capacity	0.8 L
Engine displacement	76.5 cm³
Engine power	6 hp
Power source	Gasoline

Weight and Dimensions

Weight	6700 g