2001 Yamaha YZ125N Service Manual

Complete 2001 Yamaha YZ125N service data including: engine, chassis, electrical, and tuning procedures. Publication C4085-91017.

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Document Details

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Document Number / Seller:
29609 / David Allen
File Size:
8.43 MB
File Type:
PDF
Language:
English
Pages:
251
Printable:
Yes
Category:
Bike
Last updated / verified
Aug 16, 2025

Models Covered & Key Technical Specifications

2001 Yamaha YZ125N Service Manual

Complete 2001 Yamaha YZ125N service data including: engine, chassis, electrical, and tuning procedures. Publication C4085-91017.

  • Published Engine Specs: 124 cm3 displacement establishes the standard engine displacement Specification.
  • Measured Chassis Specs: 300 mm wheel travel defines the front suspension travel range Specification.
  • Integral Cooling Specs: 1.00 L coolant capacity signifies the maximum coolant volume Capacity.
  • Operational Transmission Specs: 6-speed transmission provides the optimal gear shifting range Specification.
  • Fundamental Electrical Specs: CDI magneto ignition system establishes the standard ignition system Architecture.
  • Universal Ignition Specs: 32°/3000 r/min ignition timing indicates the standard ignition timing Protocol.

Professional Workshop Service Manual & Technical Specifications

Yamaha YZ125N (2001) Owner's Service Manual: Comprehensive Service & Repair Manual (2001) Engine-Compendium

Service-Level: 2001 Yamaha YZ125N // Operational-Framework: Bike / Engine Logic // Architecture-Focus: Complete Technical Manual.

Technical Specifications Overview Assessment-Parameter Value Context
Engine Type Liquid cooled 2-stroke, gasoline Specifies the engine's cooling and fuel type.
Displacement 124 cm3 (4.36 lmp oz, 4.19 US oz) Defines the engine's internal volume.
Starting System Kick starter Indicates the method used to initiate engine operation.
Transmission Type Constant mesh, 6-speed Details the gearbox's construction and number of gears.
Front Suspension Telescopic fork Describes the front suspension mechanism.
Rear Suspension Swingarm (link type monocross suspension) Details the rear suspension system.
Front Brake Type Single disc brake Specifies the type of front braking system.
Rear Brake Type Single disc brake Specifies the type of rear braking system.
Ignition System CDI magneto Identifies the component responsible for spark generation.
Carburetor Type TMXχ38SS/MIKUNI Specifies the carburetor model and manufacturer.

Technical chapters are organized around the following key areas:

  • Engine Maintenance: Covers disassembly, inspection, and assembly of engine components, including the cylinder head, piston, and crankshaft.
  • Chassis Systems: Details the maintenance procedures for the front fork, rear shock absorber, swingarm, and steering head.
  • Braking System: Explains the servicing of front and rear brakes, including fluid replacement and caliper maintenance.
  • Electrical Components: Outlines the inspection and servicing of the ignition system, CDI magneto, and wiring harness.
  • Transmission and Drivetrain: Provides guidance on the maintenance of the clutch, transmission gears, and final drive components.
  • Wheels and Tires: Covers the inspection and maintenance of wheels, tires, and spokes.
  • Controls and Cables: Details the adjustment and lubrication of control cables, levers, and pedals.

Fundamentally mandating proper maintenance, this manual documents torque specifications for critical fasteners to ensure optimal mating surface contact and system integrity.

FAQ

What **documented** safety precautions should be followed during engine disassembly? keyboard_arrow_down

4 Nm (0.4 m•kg, 2.9 ft•lb) is the specified torque for the power valve bolts, and it's crucial to follow all documented safety precautions to prevent injury or damage during disassembly.

Confirm the **precise** lubrication requirements for the clutch components. keyboard_arrow_down

Lithium soap base grease is required for lubricating the bearing, plain washer, and push rod to ensure precise clutch component operation.

What tools are **proper** for checking the ignition timing? keyboard_arrow_down

A dial gauge (YU-3097/90890-01252) and a dial gauge stand (YU-1256) are the proper tools required for checking and adjusting the ignition timing.

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Reviews (4)

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Rated 4 out of 5 stars
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Rated 4 out of 5 stars
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This service manual is a must-have for anyone with a Yamaha YZ125. The download process was smooth and the email with the link arrived quickly!
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The manual covers everything you need to keep your YZ125 in top shape. I appreciated the prompt email support when I had a question!