2005 Yamaha DT125RE / DT125X Motorcycle Service Manual
Complete factory diagnostics covering engine tuning, transmission adjustments, cooling system inspection, and brake service procedures for both 1D01 and 2C81 models with detailed torque specifications and component lubrication charts.
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Sample pages from the 2005 Yamaha DT125RE / DT125X Motorcycle Service Manual manual
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Models Covered & Key Technical Specifications
Yamaha DT125RE & DT125X — 2005 Mechanical Library for Operational Repository Segment.
- Engineered Print Quality: Maximum power output is standardized to 11 kW (8000 rpm) for the DT125RE model Architecture.
- Calibrated Securement Values: The spark plug specification determines BR8ES (NGK) type fastening requirement Threshold.
- Design Liquid Volume: For optimal operation, 1.3 L engine oil capacity is calibrated to the total system Mapping.
- Documented Power Rating: The ignition system is rated at CDI with 17° B.T.D.C. digital advance Configuration.
- Advanced Working Temperature: The cooling system achieves 63–67°C thermostat opening temperature operational Benchmarks.
- Primary Output Quality: Radiator capacity corresponds to 0.92 L total coolant volume system Range.
Professional Workshop Service Manual & Technical Specifications
Standard undefined Safety Manual: Motorcycle Official Yamaha DT125RE & DT125X Motorcycle Service Manual - Factory Diagnostics & Repair Procedures (2005) Powertrain-Manual
Engine-Type: DT125RE (2005), DT125X (2005), DT125RE 2C81 (2005), DT125X 1D01/1D02 (2005) // Conceptual-Layout: Two-Stroke Liquid-Cooled Motorcycle Systems / Multi-Circuit Engine Architecture // Serial-Range: Frame identification and engine serial number documentation included.
| Documentation Category | Scope | Coverage Details |
|---|---|---|
| Engine Systems | Systematic procedure documentation | Crankshaft, transmission, and power valve configuration specifications documented |
| Chassis Components | Brake and suspension assembly | Front fork oil specifications, rear shock absorber preload range, and steering geometry reference data included |
| Electrical Circuits | Ignition and charging systems | CDI magneto wiring diagrams, battery capacity reference (12V 6Ah), and lighting circuit continuity testing procedures |
The documentation is partitioned into nine comprehensive chapters covering the mechanical and electrical architecture of both DT125RE and DT125X platform variants. Reference chapters include engine removal and disassembly procedures, chassis component maintenance requirements, periodic adjustment intervals, electrical system circuit organization, and systematic troubleshooting flowcharts. The manual addresses cooling system operation with thermostatic valve function, carburetion assembly configuration, and reed valve characteristics. Additionally documented are transmission assembly procedures, clutch mechanism operation details, drive chain slack adjustment parameters, and brake system architecture for both hydraulic disc brake assemblies.
Systematically establishing technical clarity, the manual encompasses cylinder head and piston assembly specifications, including compression ratio data (6.7:1), bore and stroke dimensions (56.0mm x 50.7mm), and piston-to-cylinder clearance parameters. Verification procedures are included for wheel bearing inspection, spoke tightness assessment, and suspension component wear limits. Repair information is provided for primary drive gear operation, transmission gear dog engagement verification, and crankshaft runout measurement protocols. Special procedures are addressed for balancer weight installation, oil seal lip lubrication, and bearing retainer assembly requirements. Clearance measurements are addressed for clutch plate warpage limits, friction plate thickness specifications, and final drive sprocket wear assessment documentation.
The document includes torque specifications for the clutch boss assembly, crankshaft installation, and engine mounting fixtures to ensure proper fastener preload consistency. Throughout the service manual, component identification illustrations, exploded assembly diagrams, and step-by-step disassembly sequences facilitate systematic inspection and reassembly. The electrical troubleshooting section provides diagnostic decision trees for ignition system failures, charging system voltage verification, and lighting circuit continuity testing protocols across all motorcycle electrical subsystems.
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