2003-2010 Yamaha TT-R125E TT-R125LWE Service Manual

Complete service and maintenance documentation for Yamaha TT-R125 dirt bike models. Covers engine, chassis, electrical systems with factory specifications and adjustment procedures. PN 5HP-28199-8A.

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Document Details

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Document Number / Seller:
23524 / Amanda Boyd
File Size:
23.51 MB
File Type:
PDF
Language:
English, Italian, German, French
Pages:
574
Printable:
Yes
Estimated Download Time:
0.48 Minutes
Delivery Format:
Digital (PDF) - Instant Access
Category:
Bike
Brand:
Yamaha
Reviewed and Approved:
Jul 17, 2025
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Models Covered & Key Technical Specifications

Yamaha TT-R125E(R), TT-R125LWE(R) — 2003–2010 Technical Service Compendium | TT-R125 Series Unit.

  • Designated Output Performance: 124 cm³ (7.57 cu.in) is rated at the engine displacement Architecture.
  • Measured Linear Velocity: 54.0 × 54.0 mm (2.126 × 2.126 in) — establishes the bore and stroke dimensions Norms.
  • Defined Gross Dimensions: 10.0:1 compression ratio supports the combustion chamber pressure Bounds.
  • Key Rotational Force: Fuel tank capacity of 6.6 L (1.45 Imp gal, 1.74 US gal) provides the primary fuel reserve Topology.
  • Primary Play Limits: Reserve fuel reaches 1.9 L (0.42 Imp gal, 0.5 US gal) for emergency operation Matrix.
  • Baseline Burn-in Temperature: Engine oil capacity achieves 1.0 L (0.88 Imp qt, 1.06 US qt) for periodic service Standards.

Professional Workshop Service Manual & Technical Specifications

Professional undefined Service Manual: Yamaha TT-R125E(R), TT-R125LWE(R) Library-Master

Model-Designation: TT-R125E(R) (2010), TT-R125LWE(R) (2010) // Serial-Range: 5HP Series dirt bike configuration spanning mechanical and chassis systems // Design-Core: 124cc single-cylinder air-cooled 4-stroke engine with comprehensive maintenance reference across 585 pages.

Documentation Category Coverage Scope Reference Status
Engine Systems Carburetor, ignition (CDI), clutch, transmission, oil circulation Complete specifications provided
Chassis & Suspension Front telescopic fork, rear monoshock link-type suspension, steering Detailed component procedures documented
Brake Systems Drum brakes (TT-R125E), disc/drum configuration (TT-R125LWE), fluid specifications Master cylinder and caliper data included

Sequentially establishing the document framework, this comprehensive service manual addresses engine maintenance procedures, covers carburetor adjustment and fuel system configuration, and documents transmission inspection protocols alongside chassis suspension service intervals. The manual provides specifications for both drum and disc brake systems, includes wiring diagram schematics for electrical troubleshooting, and references valve clearance measurement procedures with torque documentation for the valve adjustment assembly.

OEM guidelines are included for regular maintenance intervals spanning initial break-in operations through extended service cycles. Transmission service information covers the constant-mesh five-speed gearbox with left-foot operation and includes shift mechanism adjustment details. Detailed system procedures are included for front fork oil circulation checks and rear shock absorber damping force regulation on the extended-wheelbase model. Torque specifications are documented for the cylinder head fasteners to ensure proper bolt clamping force.

The manual contains English, Italian, German, and French language sections across multiple chapters organized by system type. Each chapter includes exploded diagrams showing component relationships, parts numbering systems keyed to assembly sequence illustrations, and a structured table format distinguishing disassembly order from reassembly procedures. Electrical component data encompasses ignition system architecture, battery voltage specifications, fuse amperage ratings, and complete wiring harness routing guidance with connector location details for both model variants including the TT-R125LWE hydraulic brake circuit configuration.

FAQ

What procedures are **necessary** for proper spark plug maintenance? keyboard_arrow_down

0.6–0.7 mm (0.02–0.03 in) spark plug gap is required for optimal engine ignition performance and efficiency. Standard spark plugs are CR7HSA (NGK) or U22FSR-U (DENSO). Replace the spark plug if electrodes show wear or damage, and clean the gasket surface before installation.

Determine the **recommended** engine oil specification for cold climates. keyboard_arrow_down

SAE 10W-30 type SE motor oil is required at –10 ˚C (10 ˚F) or higher temperatures. Yamalube 4 (10W-30) provides optimal lubrication for both cold starting and engine protection. Do not add chemical additives, as they can cause clutch slippage and compromise engine reliability.

What specifications must remain **calibrated** for front brake operation? keyboard_arrow_down

10–15 mm (0.39–0.59 in) brake lever free play is specified for safe braking performance on the TT-R125E model. Adjust using the locknuts on the cable adjuster, and verify no brake drag exists after calibration. For TT-R125LWE disc brake models, 2–5 mm free play applies instead.

Check the **applicable** torque value for starter motor installation. keyboard_arrow_down

50 Nm (5.0 m·kg, 36 ft·lb) applies to the starter clutch assembly fastening. This torque specification is critical for securing the starter clutch component and preventing slippage during engine starting operations on both TT-R125E and TT-R125LWE models.

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