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Stihl MS 391 User Manual

Stihl MS 391
94 pages
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STIH)
STIHL MS 311, 391
2009-06

Table of Contents

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Stihl MS 391 Specifications

General IconGeneral
Motor type2-stroke motor
Chain gauge1.6 mm
Chain pitch3/8 \
Automatic oilingYes
Oil tank capacity0.35 L
Fuel tank capacity0.6 L
Engine displacement64.1 cm³
Engine power4.4 hp
Power sourceGasoline
Weight and Dimensions IconWeight and Dimensions
Weight6200 g

Summary

Introduction and Safety Precautions

Safety Precautions

Safety regulations, fuel handling, protective measures, and general warnings.

Specifications

Engine

Technical specifications for the engine, including displacement, bore, stroke, and power.

Tightening Torques

Table of fasteners and their specified tightening torques for assembly.

Troubleshooting

Clutch

Troubleshooting guide for clutch issues like worn parts or incorrect operation.

Chain Drive, Chain Brake, Chain Tensioner

Troubleshooting for chain drive, brake, and tensioner issues like wear or malfunction.

Chain Lubrication

Troubleshooting for chain lubrication problems like no oil or oil loss.

Rewind Starter

Troubleshooting for rewind starter issues like broken rope or slow rewind.

Ignition System

Troubleshooting for ignition system issues like rough running or irregular spark.

Engine

Troubleshooting for engine issues like starting problems, lack of power, or overheating.

Clutch

Clutch Drum

Procedures for removing and installing the clutch drum.

Chain Brake

Checking Operation

How to check the efficiency and function of the chain brake.

Brake Band

Procedures for removing and installing the brake band.

Brake Lever

Procedures for removing and installing the brake lever.

Chain Tensioner

Procedures for removing and installing the chain tensioner.

Engine

Muffler

Procedures for removing and installing the muffler and exhaust gasket.

Leakage Test

Procedure for testing the engine for leaks using vacuum and pressure tests.

Oil Seals

Procedures for replacing oil seals on the ignition and clutch sides.

Cylinder / Crankshaft

Procedures for removing and installing the cylinder and crankshaft.

Bearings / Crankshaft

Procedures for removing and installing crankshaft bearings.

Ignition System

Testing the Ignition Module

How to test the ignition module using specific testers.

Ignition System Troubleshooting

Troubleshooting chart for ignition system faults and no-spark conditions.

Rewind Starter

Control Levers

Chain Lubrication

Fuel System

Carburetor

Procedures for removing and installing the carburetor.

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