Yamaha YZ125(P)/LC 2-Stroke Service Manual (561 P.)

Full service documentation for YZ125(P)/LC addressing engine, chassis, electrical systems plus diagnostic flowcharts. Technical reference 5NY-28199-30.

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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 YZ125(P), Yamaha YZ125LC
Sub-models / Variants: USA, CDN, AUS, NZ, ZA, EUROPE
Build Years: 2001
Technical Data:

  • Engine: Liquid-cooled 2-stroke, single cylinder
  • Displacement: 124 cm3
  • Transmission: Constant-mesh 5-speed
  • Fuel system: TMX38SS/MIKUNI carburetor
  • Bore x Stroke: 54 x 54.5 mm
  • Starting system: Kick starter
Technical Specifications
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Document Number / Seller:
23509 / Amy Ramirez
File Size:
10.99 MB
File Type:
PDF
Language:
English, Spanish, German, French
Pages:
561
Printable:
Yes
Category:
Bike
Last updated / verified
Mar 15, 2026

Yamaha Manual Features & Content Preview

Yamaha YZ125(P) and YZ125LC Technical Overview

  • Covers 2001 Yamaha YZ125(P) and YZ125LC 2-stroke motocross machines including USA, CDN, AUS, NZ, ZA, and EUROPE market variants
  • Official Yamaha factory publication P/N 5NY-28199-30
  • Contains 47 torque-check specification tables, 3 electrical schematic/component reference guides, and 5 detailed exploded-view procedures
  • File link appears in your order confirmation straight away
  • OCR text layer lets you jump to a torque spec by keyword
  • This 561-page document is the primary reference used for the 2001 YZ125 competition model, providing foundational technical data for engine, chassis, and electrical tuning.

Manual Structure and Coverage

This factory service publication provides technical data for the maintenance and tuning of the 2001 Yamaha YZ125(P) and YZ125LC competition models. Chapters document fundamental machine identification, pre-operation checks, and detailed system specifications including what an OEM service publication covers.

The technical sections describe engine overhaul procedures, carburetor settings, and chassis adjustments for the full range of global model variants. Transmission, cylinder head, piston, and ignition components are explained with reference to factory tolerances and service limits.

Specification Highlights

Technical data includes comprehensive torque values for engine covers, cylinder head studs, and suspension linkages. The manual documents cooling system capacity at 0.95 liters for all variants. Intake reed valve thickness is specified at 0.42 mm in the cylinder head specification table. Ignition coil secondary winding resistance is listed at 6.7–10.1k ohms at 20°C in the electrical reference section.

An official 561-page Yamaha OEM workshop manual covering the 2001 YZ125(P) and YZ125LC, documenting engine, chassis, electrical, and carburetor specifications for the global 5NY-series build.

Document Reference: 5NY-28199-30, 2001

Manual FAQ, Purchase & Download Details

Does this Yamaha YZ125(P)/LC 2-Stroke Service Manual include a model compatibility preview for the 2001 YZ125 series? keyboard_arrow_down

Manual covers the Yamaha YZ125(P)/LC model specifically released for the year 2001.

What technical details and specification tables are contained within the document? keyboard_arrow_down

Document includes comprehensive specification tables covering engine bore and stroke, cylinder head dimensions, clutch plate thickness, and transmission gear ratios. It also lists general torque specifications and specific tightening torque values for various fasteners throughout the machine.

Are there electrical system references or diagrams included in this PDF? keyboard_arrow_down

Chapter 6 of the manual includes sections dedicated to electrical components, wiring diagrams, and technical ignition system reference values, such as coil resistance specifications.

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