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Yamaha YZ125 User Manual

Yamaha YZ125
142 pages
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B0V-28199-12LIT-11626-34-28
Read this manual carefully before operating this vehicle.
YZ125M2
OWNER’S MANUAL
YZ125
2021
PRINTED IN JAPAN
2020.05-0.4×1 !
(E)
B0V-28199-12_cover.indd 1-3 2020/04/30 14:40:38

Table of Contents

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Yamaha YZ125 Specifications

General IconGeneral
Displacement125cc
Bore x Stroke54.0mm x 54.5mm
Fuel DeliveryMikuni® TMX 38
IgnitionCDI
Final DriveChain
Front SuspensionKYB® Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Rear SuspensionKYB® single shock; fully adjustable, 12.4-in travel
Front BrakesHydraulic disc, 270mm
Rear BrakesHydraulic disc, 240mm
Front Tire80/100-21
Rear Tire100/90-19
Width32.5 in
Seat Height38.6 in
Engine Type2-stroke, liquid-cooled
Transmission6-speed

Summary

General Information

Safety Information

Essential safety guidelines and precautions for operating the motorcycle.

Instrument and Control Functions

Explains the operation and function of all instruments and controls on the motorcycle.

Starting and Break-In

Guides on starting procedures, engine break-in, and initial maintenance.

Maintenance After Break-In

Outlines major maintenance tasks required after the break-in period.

Torque-Check Points

Lists critical torque specifications for fasteners to ensure proper assembly and safety.

Motorcycle Care and Storage

Provides instructions for cleaning, maintenance, and proper storage of the motorcycle.

Specifications

General Specifications

Lists overall dimensions, weight, and model details of the motorcycle.

Engine Specifications

Details engine type, displacement, fuel, oil, spark plug, clutch, and drivetrain specifications.

Chassis Specifications

Outlines frame, wheel, tire, brake, and suspension specifications.

Tightening Torques

Provides general and specific torque values for various fasteners throughout the motorcycle.

Periodic Checks and Adjustments

Maintenance Intervals

Specifies routine maintenance schedules and checks based on usage intervals.

Pre-Operation Inspection and Maintenance

Outlines essential checks to perform before riding to ensure safe operation.

Engine Checks and Adjustments

Details checks and adjustments for the engine system, including spark plug and oil.

Chassis Checks and Adjustments

Covers checks and adjustments for brakes, drive chain, steering head, forks, and suspension.

Chassis

Front Wheel

Instructions for removing, installing, and tightening the front wheel assembly.

Rear Wheel

Procedures for removing, installing, and checking the rear wheel and sprocket.

Front Brake

Steps for replacing front brake pads and checking brake fluid.

Rear Brake

Procedures for replacing rear brake pads and checking brake fluid.

Front Fork

Detailed instructions for disassembling, checking, and assembling front fork legs.

Chain Drive

Explains removing, checking, cleaning, and installing the drive chain and sprockets.

Clutch

Clutch Removal, Checking, and Installation

Details on removing, checking, and installing clutch components like plates, springs, and housing.

Electrical System

Wiring Diagram

Visual representation of the motorcycle's electrical system connections.

Color Code

Explains the color coding used for wires in the wiring diagram.

Troubleshooting

Troubleshooting of Engine

Diagnosing and resolving engine starting, idling, and noise issues.

Troubleshooting of Clutch

Identifying and fixing clutch slippage, drag, and noise problems.

Troubleshooting of Transmission

Diagnosing and resolving transmission shifting, gear engagement, and noise issues.

Troubleshooting of Cooling System

Troubleshooting overheating and water pump noise issues.

Troubleshooting of Brake

Addressing poor disc brake performance and fluid issues.

Troubleshooting of Suspension

Resolving issues with front and rear suspension stiffness and leaks.

Troubleshooting of Steering/Handling

Diagnosing and fixing handlebar wobble, heavy steering, and wheel vibration.

Tuning

Engine Tuning

Guidance on carburetor settings, jet adjustments, and spark plug heat range for optimal performance.

Chassis Tuning

Adjusting suspension settings, tire pressure, and sprocket ratios for performance.

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