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Stihl MS 661 - User Manual

Stihl MS 661
138 pages
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STIH)
STIHL MS 661, 661 C-M
2013-07

Table of Contents

Other manuals for Stihl MS 661

Questions and Answers

  • P
    Patrick MooreSep 12, 2025
    Why Stihl MS 661 Chainsaw starter rope broken?
    • L
      Lindsay KochSep 12, 2025
      If the starter rope on your Stihl chainsaw is broken, it may be due to pulling the rope too vigorously or at an angle. It can also break due to normal wear. In either case, install a new starter rope.
  • J
    Julia LowerySep 14, 2025
    Why Stihl MS 661 Chainsaw starter rope does not rewind?
    • G
      gonzalezpatriciaSep 14, 2025
      If the starter rope on your Stihl chainsaw does not rewind, the rewind spring may be very dirty or corroded, requiring cleaning or replacement. Another possibility is insufficient spring tension, so check the rewind spring and increase the tension. Finally, the rewind spring may be broken, in which case you should install a new one.

Summary

Introduction and Safety Precautions

Safety Precautions

Essential safety guidelines for handling and repairing the power tool.

Troubleshooting

Clutch Troubleshooting

Diagnosing and resolving issues related to the clutch mechanism.

Ignition System Troubleshooting

Diagnosing and fixing problems related to the ignition system.

Carburetor Troubleshooting

Identifying and resolving carburetor malfunctions and performance issues.

Chain Brake

Checking Chain Brake Operation

How to verify the functionality and effectiveness of the chain brake.

Engine

Leakage Test Procedures

Methods for testing the engine for air leaks using vacuum and pressure.

Cylinder Removal and Installation

Steps for removing and installing the engine cylinder.

Ignition System

M-Tronic System

Calibrating the Control Unit

Process for calibrating the M-Tronic control unit after replacement or adjustment.

Testing with STIHL MDG 1 Analyzer

Using the STIHL MDG 1 for diagnosing M-Tronic system faults.

M-Tronic Troubleshooting Chart

Diagnostic flowcharts for resolving M-Tronic system issues.

Rewind Starter

Chain Lubrication

Fuel System

Carburetor Servicing

General procedures for removing and servicing the carburetor.

Heating System

Handle and Carburetor Heating System Troubleshooting

Troubleshooting guide for faults in the handle and carburetor heating systems.

Stihl MS 661 Specifications

General IconGeneral
Displacement91.1 cc
Chain Pitch3/8"
Engine Power5.4 kW
Fuel Capacity825 ml
Chain Oil Capacity360 ml
Guide Bar Lengths90 cm

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