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Yamaha YZ125 2019 User Manual

Yamaha YZ125 2019
236 pages
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B0V-28199-10LIT-11626-32-19
Read this manual carefully before operating this vehicle.
YZ125K2
OWNER’S SERVICE MANUAL
YZ125
2019
PRINTED IN JAPAN
2018.04-0.4×1 !
(E)
PRINTED ON RECYCLED PAPER
2019
YZ125K2
B0V-28199-10_OSM_cover.indd 1-3 2018/03/09 14:26:49
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Yamaha YZ125 2019 Specifications

General IconGeneral
Bore x Stroke54.0mm x 54.5mm
Compression Ratio8.6~10.7:1
Fuel DeliveryMikuni® TMX 38
IgnitionCDI
Final DriveChain
Front Tire80/100-21
Rear Tire100/90-19
Width32.5 in
Seat Height38.6 in
Fuel Capacity2.1 gal
Engine Type2-stroke, liquid-cooled, reed-valve inducted
Transmission6-speed
Front SuspensionKYB® spring-type fork with speed-sensitive damping; 11.8-in travel
Rear SuspensionKYB® single shock; 12.4-in travel
Front BrakeHydraulic single disc brake
Rear BrakeHydraulic single disc brake

Summary

Specifications and Diagrams

Maintenance Specifications Details

Details critical measurement standards and limits for engine and chassis components.

Tightening Torque Specifications

Specifies the correct torque values for various fasteners throughout the vehicle for proper assembly.

Regular Inspection and Adjustments

Engine Service Manual

Cylinder Head, Cylinder, and Piston Service

Covers the procedures for removing, inspecting, and assembling the cylinder head, cylinder, and piston.

Crankcase and Crankshaft Service

Covers the removal and inspection procedures for the crankcase and crankshaft components.

Chassis Service Manual

Front and Rear Brake System Service

Details the disassembly, inspection, and assembly of the front and rear brake systems.

Front Fork Suspension Service

Covers the removal, disassembly, inspection, and assembly of the front fork suspension system.

Rear Shock Absorber Service

Details the removal, inspection, and installation of the rear shock absorber assembly.

Electrical System Service

Tuning and Performance Adjustment

Engine Tuning and Carburetor Settings

Provides guidance on carburetor settings and tuning for optimal engine performance under various conditions.

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