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Yamaha YZ125 2009 User Manual

Yamaha YZ125 2009
234 pages
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PRINTED IN JAPAN
2008.4—0.4
Ɨ 1 !
(E)
YAMAHA MOTOR CO., LTD.
2500 SHINGAI IWATA SHIZUOKA JAPAN
PRINTED ON RECYCLED PAPER
PROTECT YOUR INVESTMENT
Use
Genuine YAMAHA Parts And Accessories
YZ125Y
2009
OWNER’S SERVICE MANUAL
YZ125Y
1C3-28199-14
LIT-11626-22-54
2009
q Read this manual carefully before operating this vehicle.
1C3-9-14cover  08.4.25 13:43  ćƒšćƒ¼ć‚øī˜1

Table of Contents

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Yamaha YZ125 2009 Specifications

General IconGeneral
Engine Type124cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke54.0mm x 54.5mm
Compression Ratio8.6~10.7:1
IgnitionCDI
Final DriveChain
Front BrakeHydraulic single disc brake, 250mm
Rear BrakeHydraulic single disc brake, 245mm
Front Tire80/100-21
Rear Tire100/90-19
Overall Width32.5 in
Wheelbase58.3 in
Fuel Capacity2.1 gal
Wet Weight207 lb
Dry Weight194 lb
Fuel DeliveryMikuniĀ® TMX 38
Front SuspensionSpeed-sensitive inverted fork; fully adjustable, 11.8 in travel
Rear SuspensionFully adjustable, 12.4-in travel

Summary

Chapter 1 General Information

Starting and Break-in Procedures

Details proper procedures for starting the engine and the initial break-in period.

Torque-Check Points

Lists critical fasteners and their specified tightening torques for safety and reliability.

Chapter 2 Specifications

Engine Maintenance Specifications

Details standard and limit values for engine component measurements and tolerances.

Chassis Maintenance Specifications

Lists standard and limit values for chassis component measurements and tolerances.

Engine Tightening Torques

Lists torque specifications for various engine components and fasteners.

Chassis Tightening Torques

Lists torque specifications for various chassis components and fasteners.

Chapter 3 Regular Inspection and Adjustments

Maintenance Intervals Schedule

Outlines a recommended schedule for regular maintenance and lubrication based on usage.

Pre-Operation Inspection Guide

Lists essential checks to perform on the vehicle before operating it.

Engine System Maintenance Checks

Details inspection and adjustment procedures for key engine systems.

Chassis System Maintenance Checks

Details inspection and adjustment procedures for key chassis systems.

Chapter 4 Engine

Engine Removal Procedure

Outlines the complete process for removing the engine from the motorcycle frame.

Chapter 5 Chassis

Chapter 6 Electrical System

Ignition System Inspection Steps

Provides a systematic approach to diagnosing ignition system failures.

Chapter 7 Tuning

Engine Tuning: Carburetor Setting

Explains how to adjust carburetor settings based on atmospheric conditions and engine symptoms.

Chassis Suspension Setting: Front Fork

Guides on adjusting front fork settings based on riding symptoms and conditions.

Chassis Suspension Setting: Rear Shock Absorber

Guides on adjusting rear shock absorber settings based on riding symptoms and conditions.

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