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Stihl MS 650 User Manual

Stihl MS 650
110 pages
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STIH)
STIHL MS 650, 660
2007-09

Table of Contents

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Stihl MS 650 Specifications

General IconGeneral
Chain Oil AutomaticYes
Chain Pitch3/8"
Sound Pressure Level106 dB(A)
Weight (without cutting equipment)7.3 kg
Fuel Tank Volume825 ml
Oil Tank Volume360 ml

Summary

Introduction

Safety Precautions

Specifications

Engine Specifications

Detailed technical specifications for the engine.

Fuel System Specifications

Specifications related to the fuel delivery system.

Ignition System Specifications

Technical data for the ignition components.

Chain Lubrication Specifications

Specifications for the automatic chain oiling system.

Tightening Torques

Specified torque values for various fasteners and components.

Troubleshooting Chart

Clutch, Chain Drive, Chain Brake, Chain Tensioner Troubleshooting

Diagnosing and resolving issues with clutch, chain, and brake.

Rewind Starter Troubleshooting

Troubleshooting common problems with the starter rope mechanism.

Chain Lubrication Troubleshooting

Diagnosing and fixing problems with the chain oiling system.

Ignition System Troubleshooting

Troubleshooting ignition system faults causing no-start or misfires.

Carburetor Troubleshooting

Diagnosing and rectifying issues with engine idling and acceleration.

Engine Troubleshooting

Troubleshooting general engine performance problems.

Clutch, Chain Drive, Chain Brake and Chain Tensioner

Clutch Drum / Chain Sprocket

Procedure for removing and inspecting the clutch drum and sprocket.

Replacing the Chain Catcher

Steps for removing and installing the chain catcher assembly.

Spiked Bumper

Procedure for replacing the spiked bumper component.

Clutch

Detailed steps for disassembling and assembling the clutch.

Chain Brake

Instructions for checking and removing the chain brake mechanism.

Chain Tensioner

Procedure for removing and installing the chain tensioning mechanism.

Bar Mounting Studs

Steps for removing and installing the bar mounting studs.

Engine

Muffler/Spark Arresting Screen

How to remove, clean, or replace the muffler and spark arresting screen.

Shroud

Procedure for removing and installing the engine shroud.

Leakage Test

Methods for testing crankcase for air leaks using vacuum and pressure.

Oil Seals

Instructions for removing and installing oil seals on the crankshaft.

Cylinder and Piston

Detailed steps for removing and installing the cylinder and piston assembly.

Piston Rings

Procedure for removing, cleaning, and installing piston rings.

Crankcase/Crankshaft

Steps for separating the crankcase and removing the crankshaft.

Decompression Valve

Procedure for removing and installing the decompression valve.

Ignition System

Ignition Module

Description of the ignition module and its electrical connections.

Ignition Timing

Information on ignition timing being fixed and non-adjustable.

Flywheel

Procedure for removing and installing the engine flywheel.

Contact Spring

Instructions for removing and installing the contact spring.

Testing Wiring Harness

Steps for testing the wiring harness resistance and continuity.

Ignition System Troubleshooting

Flowchart for diagnosing ignition system faults.

Rewind Starter

General Rewind Starter Information

General information about the rewind starter mechanism.

Removing and Installing Rewind Starter

Step-by-step guide for removing and installing the rewind starter.

Pawls

Procedure for removing and installing the starter pawls.

Rope Rotor

Instructions for removing and installing the starter rope rotor.

Starter Rope / Grip

Procedure for replacing the starter rope and grip assembly.

Tensioning the Rewind Spring

Steps for correctly tensioning the rewind spring.

Segment

Procedure for removing and installing the starter segment.

Starter Rope Guide Bushing

Instructions for replacing the starter rope guide bushing.

Replacing the Rewind Spring

Detailed steps for safely replacing the rewind spring.

AV System

Annular Buffers between Crankcase and Tank Housing

Procedure for removing and installing vibration damping buffers.

Annular Buffer at top of Tank Housing

Instructions for removing and installing annular buffers on the tank housing.

Master Control / Handle System

Switch Shaft

Procedure for removing and installing the switch shaft.

Throttle Trigger / Interlock Lever

Steps for removing and installing the throttle trigger and interlock lever.

Front Handle

Procedure for removing and installing the front handle assembly.

Chain Lubrication

Pickup Body / Suction Hose

Instructions for removing and cleaning the oil pickup body and suction hose.

Valve

Procedure for cleaning and replacing the oil tank valve.

Oil Pump

Detailed steps for removing, installing, and servicing the oil pump.

Fuel System

Air Filter

Instructions for cleaning and replacing the air filter element.

Carburetor

Procedure for removing and installing the carburetor unit.

Servicing the Carburetor

Detailed steps for servicing internal carburetor components.

User Adjustment

Guidance on adjusting carburetor settings for optimal performance.

Basic Setting (Carburetor with Limiter Caps)

Procedure for performing the basic setting on carburetors with limiter caps.

Tank Vent

Instructions for checking and cleaning the fuel tank vent.

Pickup Body

Information on the pickup body's function and cleaning the fuel tank.

Fuel Hose

Procedure for removing and replacing the fuel hose.

Fuel Hose in Tank

Instructions for removing and installing the fuel hose within the tank.

Separating Crankcase and Tank Housing

Steps for safely separating the crankcase from the tank housing.

Replacing the Tank Housing

Procedure for removing and installing the tank housing.

Carburetor Heating

Testing Carburetor Heating

Tests for checking the generator, heating element, and thermostatic switch.

Carburetor Heating Troubleshooting Chart

Flowchart for diagnosing faults in the carburetor heating system.

Handle Heating System

Handle Heating System Troubleshooting

Troubleshooting guide for failures in the handle heating system.

Heater Switch

Procedure for removing and installing the heater switch.

Heating Element in Rear Handle

Instructions for replacing the heating element in the rear handle.

Heating Element in Front Handle

Information on the front handle heating element and replacement.

Generator

Procedure for inspecting and installing the generator unit.

Wiring Harness

Standard Wiring Harness

Steps for removing and positioning the standard wiring harness.

Wiring Harness with Handle and Carburetor Heating

Instructions for handling the wiring harness for heated components.

Special Servicing Tools

Servicing Aids

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