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Yamaha YZ125X 2023 User Manual

Yamaha YZ125X 2023
146 pages
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BRX-28199-70
OWNER’S MANUAL
MANUEL DU PROPRIÉTAIRE
Read this manual carefully before operating this vehicle.
Il convient de lire attentivement ce manuel avant la première utilisation du véhicule.
YZ125XP
PRINTED IN JAPAN
2022.06-0.1×1 !
(E, F)
YZ125X
2023
YZ125XP
2023
BRX-28199-70_cover.indd 1-3 2022/05/30 14:50:27

Table of Contents

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Yamaha YZ125X 2023 Specifications

General IconGeneral
Displacement125cc
Bore x Stroke54.0mm x 54.5mm
IgnitionCDI
Final DriveChain
Brakes FrontHydraulic disc, 270mm
Wheelbase58.3 in
Fuel Capacity2.1 gal
Engine TypeLiquid-cooled 2-stroke
Transmission6-speed; multiplate wet clutch
Suspension FrontKYB® spring-type fork with speed-sensitive damping; 11.8-in travel
Suspension RearKYB® single shock; 12.4-in travel
Brakes RearHydraulic disc, 245mm
Tires Front80/100-21
L x W x H32.5 in
Seat Height38.2 in
Tires Rear110/100-18

Summary

General Information for Yamaha YZ125X

Safety Information and Operation Guidelines

Essential safety precautions and procedures for operating the vehicle, including responsible ownership and safe riding practices.

Location of Important Labels

Identifies the location and purpose of crucial labels on the vehicle for user awareness and safety.

Vehicle Description and Components

Provides an overview of the vehicle's main components and their functions.

Vehicle and Engine Identification Numbers

Explains how to find the Vehicle Identification Number (VIN) and Engine Serial Number for parts ordering and identification.

Included Parts and Tools

Lists and describes the parts and tools included with the vehicle for basic maintenance or operation.

Instrument and Control Functions Overview

Details the operation and function of various instruments and controls on the vehicle's handlebar and chassis.

Starting Procedure and Break-in Process

Guides on how to start the engine (cold and warm) and the recommended break-in procedures for new vehicles.

Maintenance After Break-in Period

Outlines the essential maintenance tasks required after the initial break-in period for optimal performance.

Torque Specifications for Fasteners

Lists critical torque-check points and specifications for ensuring proper assembly and safety.

Motorcycle Care and Storage Guidelines

Provides instructions on cleaning, washing, and proper storage techniques to maintain the vehicle's condition.

Specifications and Technical Data

General Vehicle Specifications

Provides overall dimensions, weight, and wheelbase specifications for the vehicle.

Engine Technical Specifications

Details engine type, displacement, bore, stroke, fuel, lubrication, and spark plug specifications.

Chassis Technical Specifications

Lists chassis-related specifications including caster, trail, wheel/tire sizes, brake types, and suspension details.

General Tightening Torque Specifications

Specifies standard tightening torques for common fasteners based on ISO thread pitch.

Periodic Checks and Adjustments

Maintenance Intervals Schedule

Details the recommended inspection and maintenance schedule based on operating hours or races.

Pre-Operation Inspection and Maintenance

Lists essential pre-ride checks for ensuring the machine is in good operating condition.

Engine Periodic Checks and Adjustments

Covers routine checks and adjustments for engine components like the pilot air screw, throttle grip, and spark plug.

Chassis Periodic Checks and Adjustments

Covers routine checks and adjustments for chassis components like brakes, drive chain, wheels, and steering.

Chassis Component Service

General Chassis Procedures

Covers removal of the number plate and side covers.

Front Wheel Removal and Installation

Step-by-step guide for removing and installing the front wheel, including axle and pinch bolt tightening.

Rear Wheel Service

Instructions for removing, checking, and installing the rear wheel, sprocket, and drive chain.

Front Brake Pad Replacement

Procedure for replacing the front brake pads, including caliper and bleed screw operations.

Rear Brake Pad Replacement

Procedure for replacing the rear brake pads, including caliper and bleed screw operations.

Handlebar Removal and Installation

Detailed steps for removing and installing the handlebar, grips, and related controls.

Front Fork Disassembly and Assembly

Comprehensive guide on disassembling, checking, and assembling the front fork legs.

Steering Head Maintenance

Procedures for checking, replacing bearings, and installing the steering head components.

Rear Shock Absorber Assembly Service

Instructions for removing and checking the rear shock absorber assembly.

Swingarm Maintenance

Guidance on checking swingarm play and vertical movement.

Chain Drive Service

Procedures for removing, checking, cleaning, and installing the drive chain.

Engine Service Procedures

Clutch Component Service

Covers removal, checking, and installation of clutch components like friction plates, springs, and housing.

Electrical System Overview

Wiring Diagram

Illustrates the vehicle's electrical system layout and component connections.

Electrical System Color Code

Provides a key to the color codes used in the wiring diagram for wire identification.

Troubleshooting Guide

Troubleshooting General Information

Provides general guidance and tips for performing basic troubleshooting on the vehicle.

Engine Troubleshooting

Diagnoses and provides solutions for engine starting issues, performance problems, and noises.

Clutch Troubleshooting

Addresses issues related to clutch slippage and dragging, offering possible causes and remedies.

Transmission Troubleshooting

Helps diagnose and resolve problems with shifting gears, gear engagement, and transmission noise.

Cooling System Troubleshooting

Focuses on diagnosing and fixing overheating issues and noises from the water pump.

Brake System Troubleshooting

Covers common brake performance issues, fluid leaks, and caliper problems.

Suspension Troubleshooting

Addresses front and rear suspension stiffness, softness, and oil leaks.

Steering and Handling Troubleshooting

Diagnoses issues like handlebar wobble, heavy steering, and front wheel vibration.

Tuning and Performance Adjustments

Engine Tuning and Carburetor Settings

Guides on adjusting carburetor settings for optimal performance under various conditions.

Chassis Tuning and Suspension Setup

Covers adjustments for sprockets, tire pressure, front fork, and rear shock absorber settings.

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