Stihl MS 250 Chainsaw Service Repair Manual

Page 1

Contents

Specifications

4

3.1 3.1.1 3.2 3.3 3.4 3.5

Engine Engine (USA only) Fuel System Ignition System Chain Lubrication Tightening Torques

4 4 5 5 5 6

4

Troubleshooting Chart

8

5.1 5.2 5.3 5.4 5.4.1 5.4.2 5.4.3 5.5

Clutch Drum / Chain Sprocket Chain Catcher Clutch Chain Brake Checking Operation Removing Installing Front Chain Tensioner Side Chain Tensioner

8.3 8.4 8.5 8.5.1 8.5.2 8.6 8.7

22 22

On

9 9.1 9.2 9.3 9.4 9.5 9.6

Fuel System

58

General Removing and Installing Rope Rotor Segment Starter Rope Elastostart Tensioning Rewind Spring Pawl

42 42 42 44 44 45 46 47 48

AV Handle System/ Handle Housing

48

35 35

8.1 8.2

11

12

Spark Plug Boot Ignition Module Testing the Ignition Coil Checking the Wiring Harness Ignition Timing Removing and Installing Flywheel Ignition System Troubleshooting

8

55 55 56 57

42

7.1 7.2 7.3

7.4.1 7.4.2

54

10.3 10.4 10.5

Pickup Body Connector/ Suction Hose Valve Worm Oil Pump

Rewind Starter

34

7.4

10.1 10.2

39

Ignition System

15 15 16 16 18 18 19 20

28 29 31 33 33 34

7

7.5 7.6

lin

5.6

Clutch, Chain Drive, Chain Brake and Chain Tensioner

23 24 24 25 26 26

54

Air Filter Carburetor Leakage Test Removing and Installing 11.2.3 Adjusting (Carburetor without Limiter Cap) 11.2.4 Adjusting (Carburetor with Limiter Cap) 11.2.5 Standard Setting (Carburetor with Limiter Cap) 11.3 Tank Vent 11.4 Pickup Body 11.5 Suction Hose 11.6 Manual Fuel Pump 11.7 Hoses 11.8 Fuel Tank

sio

5

8 9 10 11 12 14

6.5 6.6 6.7 6.8 6.9

er

4.2 4.3 4.4 4.5 4.6

Clutch, Chain Drive, Chain Brake, Chain Tensioner Rewind Starter Chain Lubrication Ignition System Carburetor Engine

6.2 6.2.1 6.2.2 6.2.3 6.3 6.4

ev

4.1

Muffler/Spark Arresting Screen Leakage Test Preparations Pressure Test Vacuum Test Oil Seals Removing and Installing Cylinder Piston Piston Rings Crankshaft Decompression Valve

Chain Lubrication

Annular Buffers Front Handle Handle Housing Switch Shaft Contact Spring Throttle Trigger/ Interlock Lever

11.1 11.2 11.2.1 11.2.2

rin t

3

6.1

10

ep

3

23

rr

Safety Precautions

Engine

36

fo

2

6

ot

2

-n

Introduction

n

1

36 37 37 38

13

58 59 59 60 61 62 62 63 64 64 65 65 67

Special Servicing Tools

69

Servicing Aids

71

48 49 50 52 52 53

q Š 2002 Andreas Stihl AG & Co., Waiblingen

MS 210, 230, 250

1


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