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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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Yamaha Models Covered & Key Technical Specifications

Models: Yamaha YZ125X1
Sub-models / Variants: USA, CDN, EUROPE, ZA, AUS, NZ
Build Years: 2008
Serial Numbers: 1C3D (USA, CDN), 1C3E (EUROPE), 1C3G (AUS, NZ, ZA)
Technical Data:

  • Engine displacement: 124 cm3
  • Engine type: Liquid cooled 2-stroke, single cylinder
  • Transmission type: 6-speed constant-mesh
  • Frame type: Semi double cradle
  • Front fork oil capacity: 524 cm3 (USA, CDN, ZA, AUS, NZ) / 526 cm3 (EUROPE)
  • Rear shock spring rate: K=46.0 N/mm (4.70 kg/mm, 263.2 lb/in)
  • Fuel capacity: 8.0 L (2.11 US gal)
  • Spark plug: NGK BR9EVX
  • Carburetor: MIKUNI TMX 38SS
Technical Specifications
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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

Yamaha Manual Features & Content Preview

2008 Yamaha YZ125X1 Owner's Service Manual Overview

  • Covers 2008 Yamaha YZ125X1 high-performance two-stroke motocross motorcycles including regional variants for USA, Canada, Europe, Australia, New Zealand, and South Africa
  • Official Yamaha publication P/N LIT-11626-21-43, first edition dated June 2007
  • Documents key maintenance parameters including 46.0 N/mm rear shock spring rate and 124 cm3 engine displacement specifications
  • Delivered as a direct download the moment payment clears
  • Full-text search finds any part number in seconds
  • Laid out for standard letter and A4 printing
  • This first edition serves as the base technical reference for the 2008 YZ125X1 production model, providing critical assembly tolerances and fastener torque data not found in standard owner-supplied handbooks

Technical Scope and Documentation

The 2008 Yamaha YZ125X1 service manual outlines essential inspection and maintenance procedures required to maintain peak performance on closed-course racing circuits. Chapter coverage begins with general machine identification, tool requirements for major assembly, and specific break-in procedures for the 124 cm3 two-stroke engine. Subsequent sections detail internal inspection criteria for the constant-mesh 6-speed transmission, YPVS power valve system, and the liquid-cooled cylinder head assembly.

Specification and Maintenance Data

Technical data is provided through detailed maintenance tables covering chassis geometry, suspension settings, and electrical reference values. The manual includes specific tightening torque values for chassis components such as the swingarm pivot and steering head assembly. Electrical system information includes CDI magneto resistance values and ignition timing specifications. Coolant system capacity is documented at 0.9 liters. Steering ring nut final torque is specified at 7 Nm. Piston-to-cylinder clearance standards are listed at 0.040–0.045 mm.

Reference only — always consult a certified technician before performing service on this equipment. This 100-page official Yamaha workshop publication provides technicians with the necessary tolerances, fluid capacities, and torque settings for the 2008 Yamaha YZ125X1.

Manual FAQ, Purchase & Download Details

Can I find technical specification tables and tightening torque data within the document sections? keyboard_arrow_down

Manual includes dedicated specification sections that contain maintenance information, tightening torques, and general data for the motorcycle.

Which chapters cover electrical components, wiring diagrams, and the ignition system? keyboard_arrow_down

Chapter 6 is designated for electrical systems and provides information regarding components and wiring diagrams. This section helps users locate where these specific electrical reference diagrams are indexed.

What publication information identifies this specific service manual edition? keyboard_arrow_down

Document is identified as the 1st Edition, dated June 2007, under part number LIT-11626-21-43. It is intended for the 2008 Yamaha YZ125X1 model as detailed on the cover and title pages.

Does the manual include exploded views and part diagrams for disassembly tasks? keyboard_arrow_down

Document contains exploded diagrams at the start of removal and disassembly sections to assist with identifying parts and their layout.

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