2008 Yamaha YZ125X1 Owner's Service Manual

Diagnostic procedures and component service for your YZ125X1, covering engine, chassis, and electrical systems. Ref: LIT-11626-21-43

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Document Details

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Document Number / Seller:
26558 / David Harris
File Size:
8.13 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Motorbike
Last updated / verified
Oct 6, 2025

Models Covered & Key Technical Specifications

Yamaha YZ125X1 (LIT-11626-21-43) – 2008. Original Directory | Volume.

  • Engine Specifications: 124 cm3 is the standard displacement capacity for this motorcycle.
  • Transmission Specifications: For optimal operation, 6-speed constant-mesh defines the gear ratio Framework.
  • Chassis Specifications: The frame type is semi double cradle -- indicating robust construction Benchmarks.
  • Front Suspension: The front fork requires 524 cm3 of Suspension oil "S1" for proper operation Sequences.
  • Rear Suspension: The rear shock absorber has a spring rate of K=46.0 N/mm (4.70 kg/mm, 263.2 lb/in) Baseline.
  • Brake System: Front and rear brakes utilize single disc brake configurations for reliable stopping Mapping.

Professional Workshop Service Manual & Technical Specifications

Factory-Level Repair Electrical Manual: Yamaha YZ125X1 manual, 2008 PDF Hydraulic-Guide

Operational-Framework: LIT-11626-21-43 // Calibration-Scope: Motorbike / Yamaha Logic // Operational-Framework: 124cc, liquid-cooled, 2-stroke. Assessment-Element Value Calibration-Data
Engine Type Liquid cooled 2-stroke, gasoline Standard
Cylinder Arrangement Single cylinder, forward inclined Standard
Displacement 124 cm³ (4.36 Imp oz, 4.19 US oz) Standard
Bore x Stroke 54 x 54.5 mm (2.126 x 2.146 in) Standard
Compression Ratio 8.6–10.7 : 1 Standard
Starting System Kick starter Standard
Lubrication System Premix (30 : 1)(Yamalube 2-R) Standard

Cataloging major assemblies into seven chapters, this manual provides a comprehensive sequence of repair and maintenance information. The following systems are documented:

  • Engine: Covering cylinder head, piston, clutch, crankshaft, transmission, and more.
  • Chassis: Detailing front and rear wheels, brakes, suspension, and steering.
  • Electrical: Including ignition system and CDI components.
  • Tuning: With procedures for engine and chassis adjustments. Service intervals are documented for routine checks and part replacements to ensure optimal performance. Component locations are identified for ease of access during maintenance. Service procedures are documented with clear instructions for disassembly and reassembly. Calibration requirements are specified for critical adjustments. Electrical system documentation covers wiring diagrams and component testing. This manual documents torque specifications for various components to ensure proper bolt stretch prevention and secure assembly.

FAQ

Confirm the **recommended** diagnostic procedures for the CDI magneto? keyboard_arrow_down

7 Nm (0.7 m•kg, 5.1 ft•lb) is the specified torque for the stator screws when aligning the ignition timing.

What tools **calibrated** fluid capacity requirements are listed? keyboard_arrow_down

524 cm³ (18.4 Imp oz, 17.7 US oz) is the oil capacity for the front fork, requiring suspension oil "S1".

Identify the **applicable** component identification for the rear wheel sprocket? keyboard_arrow_down

42 Nm (4.2 m•kg, 30 ft•lb) is the specified torque for the rear wheel sprocket nut to ensure proper seating.

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Reviews (2)

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New
The service manual is incredibly detailed and easy to follow. It made maintaining my bike a breeze!
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I had a smooth download process and received quick email support when I needed it. Highly recommended!