1975-1980 Yamaha RD125 / RD125B / RD125DX Owner's Manual
Complete operation and maintenance documentation for Yamaha RD125 models — covers operation, periodic maintenance, minor repairs, clutch adjustment, brake tuning, and troubleshooting. Publication 507-28199-81
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Sample pages from the 1975-1980 Yamaha RD125 / RD125B / RD125DX Owner's Manual manual
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Models Covered & Key Technical Specifications
Yamaha RD125, RD125B & RD125DX — 1975–1980 Commercial Library for RD125 Series Collection.
- Documented Imaging Specs: 11.5 L (3.05 US gal) is standardized to the fuel tank volume Sequences.
- Measured Coupling Torques: For ignition system assembly, 2.5–3.0 m·kg is rated at the spark plug fastening Baseline.
- Universal Fill Levels: Transmission oil reaches 750 ± 50 cm³ sets the crankcase capacity Requirements.
- Technical Assembly Gap: The clutch lever requires 2–3 mm between the lever front edge and lever holder Threshold.
- System Ambient Limits: Tire pressure spans 1.6–2.4 kg/cm² (Front 1.6–2.0, Rear 2.0–2.4) defines the operational envelope Mapping.
- Prescribed Precision Specs: Spark plug electrode spacing specifies 0.6–0.7 mm for combustion chamber ignition Configuration.
Professional Workshop Service Manual & Technical Specifications
Practical Installation Manual: Yamaha RD125, RD125B & RD125DX Maintenance & Repair Manual, 1975-1980 Knowledge-Base
Design-Core: RD125, RD125B, RD125DX (1975-1980) // Technical-Benchmarks: Two-stroke engine systems / Transmission and drivetrain logic // Design-Core: Factory documentation with multilingual support.
| Document Overview | Content Coverage | Reference Details |
|---|---|---|
| Owner's and maintenance manual | 86-page comprehensive guide | Covers all service intervals |
| Trilingual (English, French, German) | Control functions and specifications | See Chapter introductions |
| 1975-1980 model variants | Complete operational procedures | Indexed maintenance charts |
Diagnostic procedures address the foundation of this manual, which documents control functions and operational sequences, explores periodic maintenance requirements, provides component adjustment protocols, and includes troubleshooting reference material. This comprehensive resource examines ignition systems, fuel delivery mechanisms, transmission operation, and brake system parameters while clarifying electrical controls and general motorcycle features.
Brake system specifications are included for the front and rear brake assemblies across all three model variants. Safety procedures are documented for pre-operation checks, fuel tank filling, and engine starting protocols. Fluid capacities are listed for the oil tank (1.5 liters), fuel tank (11.5 liters), and transmission reservoir (750±50 cm³). Tool requirements are listed for periodic maintenance tasks, including the owner's standard toolkit and necessity for a torque wrench to properly secure fasteners. Installation guidelines are provided for spark plugs, fuel petcock filters, air filter elements, and drive chain components.
The manual contains detailed specifications for tire pressure variation by riding conditions, with normal riding at 1.6 kgs/cm² front and 2.0 kgs/cm² rear, and high-speed riding at 2.0 kgs/cm² front and 2.4 kgs/cm² rear. Electrical system data includes controls for headlight, flasher lights, horn, and engine stop switch configurations for European, Canadian, and other regional variants. The document references spark plug gap specifications of 0.6-0.7 mm and contact breaker point gap of 0.3-0.4 mm. Drive chain tension is documented at approximately 20 mm vertical deflection, with adjustment procedures clearly outlined. The manual documents torque specifications for the spark plug to ensure proper fastener security.
Complete periodic maintenance and inspection charts span the critical break-in period (0-1,000 km) and extended service intervals through 6,000 km intervals. Lubrication schedules identify specific components requiring motor oil, grease, or mixed application protocols. The document includes wiring diagrams for electrical systems, component location illustrations with numbered callouts for all major assemblies, and detailed adjustment procedures for clutch, brakes, and fuel delivery systems. Troubleshooting methodology provides systematic fault diagnosis for fuel system blockages, compression loss, and ignition circuit failures, guiding owners and technicians toward appropriate resolution pathways.
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