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Stihl MS 390

Stihl MS 390
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STIH)
STIHL MS 290, 310, 390
2004-11

Table of Contents

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Stihl MS 390 Specifications

General IconGeneral
Engine Displacement64.1 cc
Chain Pitch3/8"
Weight6.2 kg
Guide Bar Lengths40 to 50 cm
Fuel Capacity0.68 l (23.0 oz)

Summary

STIHL MS 290, 310, 390 Introduction

STIHL MS 290, 310, 390 Safety Precautions

STIHL MS 290, 310, 390 Specifications

Engine Specifications

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

Engine Specifications (USA)

Engine specifications specific to the USA market, including displacement in cubic inches.

STIHL MS 290, 310, 390 Fuel System Specifications

Ignition System Specifications

Specifications for the ignition system, including air gap and spark plug details.

Chain Lubrication Specifications

Specifications for the chain lubrication system, including oil delivery rate.

STIHL MS 290, 310, 390 Tightening Torques

STIHL MS 290, 310, 390 Troubleshooting Chart

Clutch, Chain Drive, Brake, Tensioner Troubleshooting

Troubleshooting for clutch, chain drive, brake, and tensioner issues.

STIHL MS 290, 310, 390 Rewind Starter Troubleshooting

STIHL MS 290, 310, 390 Chain Lubrication Troubleshooting

STIHL MS 290, 310, 390 Ignition System Troubleshooting

STIHL MS 290, 310, 390 Carburetor Troubleshooting

STIHL MS 290, 310, 390 Engine Troubleshooting

STIHL MS 290, 310, 390 Clutch, Chain Drive, Brake, Tensioner

Clutch Drum and Chain Sprocket

Procedures for removing, inspecting, and cleaning the clutch drum and chain sprocket.

STIHL MS 290, 310, 390 Chain Catcher

Spiked Bumper

Procedures for removing and installing the spiked bumper.

STIHL MS 290, 310, 390 Collar Stud

Clutch

Details on removing the clutch, including spark plug removal and locking strip use.

STIHL MS 290, 310, 390 Chain Brake

Checking Chain Brake Operation

Procedure to check the proper functioning and responsiveness of the chain brake.

Removing and Installing Chain Brake

Step-by-step guide for removing and installing the chain brake components.

STIHL MS 290, 310, 390 Replacing Pins

Removing Pivot Pins

Instructions on how to remove various pivot pins from the housing.

STIHL MS 290, 310, 390 Installing Pivot Pins

STIHL MS 290, 310, 390 Chain Tensioner

STIHL MS 290, 310, 390 Engine

Muffler and Spark Arresting Screen

Procedures for removing, cleaning, and installing the muffler and spark arresting screen.

STIHL MS 290, 310, 390 Leakage Test

Leakage Test Preparations

Steps to prepare the engine and components for leakage testing.

Pressure Test

Procedure for performing a pressure test on the engine crankcase.

Vacuum Test

Procedure for performing a vacuum test on the engine crankcase.

STIHL MS 290, 310, 390 Oil Seals

STIHL MS 290, 310, 390 Shroud

STIHL MS 290, 310, 390 Engine Removal and Installation

Cylinder Removal and Installation

Procedures for removing and installing the cylinder, including piston and crankshaft handling.

STIHL MS 290, 310, 390 Piston

STIHL MS 290, 310, 390 Crankshaft

STIHL MS 290, 310, 390 Ignition System

Ignition Module Information

Information on the ignition module and its function in timing control.

Ignition Timing Details

Details on fixed ignition timing and its lack of mechanical wear adjustment.

Ignition Module Removal and Installation

Step-by-step instructions for removing and installing the ignition module.

STIHL MS 290, 310, 390 Testing the Ignition Module

STIHL MS 290, 310, 390 Spark Plug Boot

STIHL MS 290, 310, 390 Ignition Lead

STIHL MS 290, 310, 390 Flywheel

STIHL MS 290, 310, 390 Contact Spring

Replacing Wiring Harness

Instructions for removing and installing the vehicle's wiring harness.

STIHL MS 290, 310, 390 Ignition System Troubleshooting

STIHL MS 290, 310, 390 Rewind Starter

Rewind Starter General

General information and troubleshooting tips for the starter rope and mechanism.

STIHL MS 290, 310, 390 Rewind Starter Removal and Installation

Pawl Removal and Installation

Instructions for removing and installing the pawl in the rope rotor.

Rope Rotor Removal and Installation

Procedures for removing and installing the rope rotor, including reliving spring tension.

STIHL MS 290, 310, 390 Starter Rope and Grip

Starter Rope Tensioning

Step-by-step guide for properly tensioning the rewind spring for the starter rope.

STIHL MS 290, 310, 390 Starter Rope Guide Bushing

STIHL MS 290, 310, 390 Replacing Rewind Spring

STIHL MS 290, 310, 390 AV Handle SystemHandle Housing

Front Handle Components

Procedures for removing and installing the front handle components.

STIHL MS 290, 310, 390 Handle Housing

STIHL MS 290, 310, 390 Annular Buffers

Front HandleHandle Housing Buffers

Instructions for removing and installing annular buffers between handles.

STIHL MS 290, 310, 390 Handle HousingEngine Housing Buffers

Front HandleEngine Housing Buffers

Steps for installing annular buffers between the front handle and engine housing.

STIHL MS 290, 310, 390 Switch Shaft

STIHL MS 290, 310, 390 Throttle Trigger and Interlock Lever

STIHL MS 290, 310, 390 Chain Lubrication

Pickup Body and Suction Hose

Steps for removing and cleaning the pickup body and suction hose for oil supply.

STIHL MS 290, 310, 390 Valve

STIHL MS 290, 310, 390 Tank Cap

Oil Pump Removal and Installation

Instructions for removing and installing the oil pump assembly.

Oil Pump Removing and Installing

Step-by-step guide for removing and installing the oil pump.

STIHL MS 290, 310, 390 Oil Pump Servicing

STIHL MS 290, 310, 390 Fuel System

Air Filter Maintenance

Procedures for cleaning and removing the air filter and prefilter for maintenance.

STIHL MS 290, 310, 390 Carburetor

Carburetor Removal and Installation

Step-by-step guide for removing and installing the carburetor assembly.

STIHL MS 290, 310, 390 Carburetor Leakage Test

STIHL MS 290, 310, 390 Carburetor Servicing

Metering Diaphragm Servicing

Instructions for removing, inspecting, and replacing the metering diaphragm and gasket.

STIHL MS 290, 310, 390 Inlet Needle

STIHL MS 290, 310, 390 Fixed Jet

Pump Diaphragm

Steps for removing and installing the pump diaphragm and gasket.

STIHL MS 290, 310, 390 Adjusting Carburetor

User Adjustment (No Limiter Caps)

Guide for adjusting the carburetor's high and low speed screws for optimal performance.

STIHL MS 290, 310, 390 User Adjustment (With Limiter Caps)

STIHL MS 290, 310, 390 Basic Setting (With Limiter Caps)

STIHL MS 290, 310, 390 Tank Vent

Tank Vent (Machines up to 2002)

Procedures for checking and replacing the tank vent on machines manufactured up to 2002.

STIHL MS 290, 310, 390 Tank Vent (Machines from 2002)

STIHL MS 290, 310, 390 Fuel Tank

Pickup Body Maintenance

Instructions for cleaning and replacing the pickup body (filter) in the fuel tank.

Suction Hose Removal and Installation

Procedures for removing and installing the fuel suction hose and its flange.

STIHL MS 290, 310, 390 Tank Cap

Replacing Engine Housing

Steps for removing and installing the engine housing, which is integrated with the fuel tank.

STIHL MS 290, 310, 390 Special Servicing Tools

STIHL MS 290, 310, 390 Servicing Aids

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