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Yamaha 20MSHB User Manual

Yamaha 20MSHB
426 pages
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1995 - 2009
OUTBOARD / MOTEUR HORS-BORD
SERVICE MANUAL / MANUEL D’ATELIER
Model : 20ESHT2, 20ESHU2, 20ESHV2,
20ESHW2, 20ESHX2, 20ESHY2, 20MLH,
20MLHA, 20MLHB, 20MLHC, 20MLHD,
20MLHKZ, 20MLHT2, 20MLHU2, 20MLHV2,
20MLHW, 20MLHW2, 20MLHX, 20MLHX2,
20MLHY, 20MLHY2, 20MLHZ, 20MSH,
20MSHA, 20MSHB, 20MSHC, 20MSHD,
20MSHKZ, 20MSHT2, 20MSHU2,
6L3281977100
*6L3281977100*

Table of Contents

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Yamaha 20MSHB Specifications

General IconGeneral
Engine Type2-Stroke
Horsepower20 hp
Cylinders2
Gear Ratio2.08:1
Fuel SystemCarburetor
Starting SystemManual
Shaft Length15 inches
SteeringTiller
Trim SystemManual

Summary

Preface

Lower Unit Service

Lower Unit Assembly

Exploded diagram and removal/installation for the lower unit assembly.

Water Pump & Bearing Housing

Exploded diagram and service for water pump and bearing housing.

Reverse Gear Operations

Exploded diagram and service points for the reverse gear assembly.

Forward Gear Operations

Exploded diagram and service points for the forward gear assembly.

Shimming and Backlash

Procedures for shim selection and backlash measurement.

Bracket Unit Service

Steering, Shift Lever & Tiller Handle

Exploded diagram and removal/installation for steering and control components.

Cowling & Upper Case

Exploded diagrams and removal/installation for cowling and upper case.

Clamp & Swivel Brackets

Exploded diagrams and removal/installation for clamp and swivel brackets.

Steering Bracket Disassembly

Detailed disassembly steps for the steering bracket.

Electrical System Service

Electrical Components Overview

Diagram showing electrical component layout and identification.

Electrical Analysis & Testing

Procedures for electrical system inspection and voltage measurement.

Ignition System

Details on ignition system components, spark gap, and CDI voltage.

Starting System

Information on battery, fuse, wiring, switches, and starter relay.

Charging System

Testing procedures for rectifier output and lighting coil.

Warning System

Testing procedures for thermo switch, oil level sensor, and warning lamp.

Trouble-Shooting

Troubleshooting Analysis Chart

Chart correlating engine problems with check elements and reference chapters.

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