2002 Yamaha TT-R125 / TT-R125LW Service Manual

Complete service and maintenance guide for TT-R125(R) and TT-R125LW(R) trail bikes. Covers engine, chassis, and electrical systems with detailed repair procedures. PN 5HP-28199-84

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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 TT-R125(R), Yamaha TT-R125LW(R)
Sub-models / Variants: R (TT-R125), LW (TT-R125LW)
Build Years: 2002
Technical Data:

  • Engine displacement: 124 cm³ (7.57 cu.in)
  • Engine configuration: Single cylinder, forward inclined, 4-stroke, SOHC
  • Transmission: 5-speed, constant mesh
  • Fuel tank capacity: 6.6 L (1.74 US gal)
  • Spark plug gap: 0.6–0.7 mm (0.02–0.03 in)
  • Cylinder head bolt torque (M8): 22 Nm (16 ft•lb)
  • Intake valve clearance (cold): 0.08–0.12 mm (0.0031–0.0047 in)
Technical Specifications
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Document Number / Seller:
24273 / Patrick King
File Size:
21.25 MB
File Type:
PDF
Language:
English. French, German
Pages:
510
Printable:
Yes
Category:
Motorbike
Last updated / verified
Oct 19, 2025

Yamaha Manual Features & Content Preview

Yamaha TT-R125 and TT-R125LW 2002 Service Guide

  • Covers 2002 Yamaha TT-R125(R) and TT-R125LW(R) off-road motorcycles, including chassis, engine, and electrical system specifications
  • Original OEM publication 5HP-28199-84, First Edition, April 2002
  • Contains 47 detailed exploded-view diagrams, 10+ torque-check point maps, and 30+ pages of maintenance specification tables
  • File link appears in your order confirmation straight away
  • OCR text layer lets you jump to a torque spec by keyword
  • This 2002 first edition is the factory-authorized reference for the TT-R125 series, documenting the base model alongside the LW long-wheelbase variant

Technical Documentation Scope

The 2002 Yamaha TT-R125 and TT-R125LW service manual provides thorough technical documentation for the operation and maintenance of the 124 cm³ single-cylinder engine platform. The text details engine internals, including cylinder head geometry, cam dimensions, and valve spring compression data, alongside clutch assembly, shift mechanism, and ignition system specifications. Chapters cover chassis components such as the telescopic front forks, monocross rear suspension, and braking systems, including specific adjustments for drum brakes on the standard model and front disc brakes on the LW edition. The document serves as a repository for factory-recommended torque values, fluid capacities, and electrical reference parameters for wire harnesses and ignition circuits.

Specification Previews

Maintenance and technical data sections provide precise reference values for shop use. Cylinder head bolt torque for the M8 fasteners is specified at 22 Nm (16 ft•lb). Intake valve clearance for the engine is listed at 0.08–0.12 mm in the engine maintenance table. The fuel tank capacity for both models is documented at 6.6 liters. Learn more about the technical structure of factory service documentation to assist with your maintenance planning.

Reference only — always consult a certified technician before performing service on this equipment. An official 510-page Yamaha OEM service manual covering the 2002 TT-R125 and TT-R125LW, documenting engine, chassis, electrical, and fuel specifications for the 124 cm³ engine platform.

Manual FAQ, Purchase & Download Details

Does this 2002 Yamaha TT-R125 service manual include the TT-R125LW submodel in its coverage? keyboard_arrow_down

Document covers both the TT-R125(R) and the TT-R125LW(R) models as listed in the publication title and model index.

What technical reference categories are contained within the specification tables of this document? keyboard_arrow_down

Specification tables include engine displacement data, bore and stroke dimensions, valve clearance references, spark plug gap settings, and tightening torque values for major components.

Are there exploded views, wiring diagrams, or connector pinout references provided in the manual? keyboard_arrow_down

Manual includes exploded diagrams at the start of disassembly sections, electrical component overviews, and wiring diagram references for the electrical systems.

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