2004 Yamaha YZ125T1 Owner's Service Manual

Technician-level documentation for the YZ125T1, covering engine, chassis, electrical, and tuning systems. PN LIT-11626-18-33.

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Document Details

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Document Number / Seller:
28073 / Walter Edwards
File Size:
10.22 MB
File Type:
PDF
Language:
English
Pages:
259
Printable:
Yes
Category:
Motorbike
Last updated / verified
Dec 17, 2025

Models Covered & Key Technical Specifications

2004 Yamaha YZ125T1 Owner's Service Manual

Technician-level documentation for the YZ125T1, covering engine, chassis, electrical, and tuning systems. PN LIT-11626-18-33.

  • Published Specifications: 124 cc displacement ensures optimal engine performance.
  • Measured Intervals: Regular maintenance checks every third race are recommended for optimal operation.
  • Integral Components: The ignition system utilizes a CDI magneto for reliable spark delivery.
  • Operational Standards: Pre-operation inspection and maintenance are detailed for safe operation.
  • Fundamental Procedures: Clutch and primary driven gear removal and installation procedures are outlined.
  • Universal Design: The chassis features telescopic front forks and a swingarm rear suspension for enhanced handling.

Professional Workshop Service Manual & Technical Specifications

Verified Technical Overhaul Manual: Motorcycle Yamaha YZ125T1 2004 - Comprehensive Maintenance & Repair Guide Field-Reference

Conceptual-Layout: YZ125T1 // Specification-Class: Motorcycle / Performance Logic // Design-Core: 2-stroke Engine.

Assessment-Parameter | Technical-Path | Calibration-Standards

---|---|--- Engine Performance | Mechanical Operation | 124 cc Displacement Suspension System | Ride Dynamics | Telescopic Front Forks Electrical Components | Ignition System | CDI Magneto Maintenance Schedule | Interval Guidelines | Every Third Race Braking System | Hydraulic Operation | Disc Brakes Gearbox | Transmission Ratios | 6-Speed Constant Mesh

Following OEM groupings, the manual includes sections on General Information, Specifications, Regular Inspection and Adjustments, Engine, Chassis, Electrical, and Tuning.

Key Systems and Procedures Covered

The documentation addresses engine specifications, including displacement and bore/stroke ratios, crucial for understanding performance limits. Assembly instructions are detailed for critical components like the clutch and primary driven gear, ensuring proper reassembly. Hydraulic schematics are included for the front and rear brake systems, vital for maintaining stopping power. Steering component information is provided for the front fork and steering head, ensuring precise control. Inspection guidelines are provided for the chassis, including the wheels and suspension, for overall vehicle integrity.

This manual documents torque specifications for engine components to ensure proper cyclic stress resistance.

FAQ

What does the **exact** assembly sequence for the clutch cover? keyboard_arrow_down

6 clutch spring screws are used to secure the clutch cover with a torque of 10 Nm (1.0 m•kg, 7.2 ft•lb).

Reference the **specific** service interval parameters for the air filter. keyboard_arrow_down

Clean and lubricate the air filter after every race or every third race; replace as needed.

What are the **designated** system architecture for the ignition? keyboard_arrow_down

The ignition system utilizes a CDI magneto for reliable spark delivery.

Specify the **critical** tool requirements for clutch boss removal. keyboard_arrow_down

Clutch holding tools, such as YM-91042 or 90890-04086, are required to hold the clutch boss securely.

What is the **required** electrical values for the CDI magneto? keyboard_arrow_down

The stator's source coil 1 resistance is 720-1,080 Ω, and source coil 2 resistance is 44-66 Ω at 20°C (68°F).

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Reviews (3)

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This manual covers everything you need to know about the YZ125T1. The customer support was very helpful and answered my queries promptly. I feel more confident tackling repairs myself now!
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Downloading the manual was a breeze, and I received the link almost instantly. The information provided is thorough and has helped me a lot with my bike maintenance. Excellent service!
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This manual is incredibly detailed and easy to follow. The diagrams are a lifesaver! I had a few questions regarding maintenance and the support team responded within hours. Highly recommend!