1976-1979 Yamaha RD250, RD400 Supplementary Service Manual

For Yamaha RD250 & RD400: diagnostics, service, and parts for 1976-1979 models. Publication 2R8-28197-80.

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Document Details

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Document Number / Seller:
24752 / Jennifer Mason
File Size:
56.26 MB
File Type:
ZIP
Language:
English, German, French
Printable:
Yes
Category:
Motorbike
Last updated / verified
Feb 6, 2026

Models Covered & Key Technical Specifications

Operational Training Factory Manual: Motorcycle Yamaha RD250, RD400 supplementary repair manual, covers 1976-79 Chassis-Documentation

Engine-Type: RD250, RD400 (2R8-28197-80) | Model-Portfolio: Yamaha Motor Corporation, Ltd. Package

  • Factory Play Limits: 28° establishes the operating range for minimum turning radius.
  • Essential Electrical Specs: For optimal operation, 2,000 r/min defines the engine speed for checking the generated voltage.
  • Key Climate Specs: 60 km/h indicates the maximum speed at which braking distance is within specifications.
  • Primary Spacing Data: The fuel tank capacity requires 1.6 lit (1.7 US qt) for proper operation.
  • General Travel Rate: A 30-40 mm range defines the chain free play for optimal performance.
  • Approved Print Quality: The minimum turning radius of 2,300 mm allows for agile maneuverability.

Professional Workshop Service Manual & Technical Specifications

Operational Training Factory Manual: Motorcycle Yamaha RD250, RD400 supplementary repair manual, covers 1976-79 Chassis-Documentation

Engine-Type: RD250, RD400 (2R8-28197-80) // Model-Portfolio: Yamaha Motor Corporation, Ltd. / Motorcycle Logic // Engine-Type: Covers 1976-79 models, including essential technical details.

Performance-Element System-Path Logic
Operation Overview Engine & Chassis Documenting standard procedures
Model Variants RD250, RD400 Specific to each motorcycle
Publication Details Service Manual Including part numbers and revisions
Reference Data Specifications For accurate repair and maintenance

Repair data is categorized into the following sections: Engine Overhauling, Carburetion, Chassis, Electrical, and Appendices. These sections detail repair procedures, component identification, and technical specifications necessary for maintaining the Yamaha RD250 and RD400 motorcycles. Wiring diagrams are provided for clear electrical system understanding. Fuel system procedures are documented, guiding through adjustments and maintenance. Adjustment procedures are detailed for various components to ensure optimal performance. Timing procedures are documented, crucial for engine efficiency. Technical notes are provided for specific situations and warnings. The manual also documents torque specifications for engine components to ensure proper bolt stretch prevention and assembly integrity.

Engine System Documentation

The manual thoroughly documents the engine systems of the Yamaha RD250 and RD400. This includes disassembly and assembly procedures for the engine, carburetor, and related components. Detailed instructions cover cylinder head, piston, crankshaft, and clutch assemblies, ensuring a complete overhaul process.

Chassis and Electrical Systems

This section covers the chassis components, including brakes, wheels, and suspension systems. Additionally, the electrical system is thoroughly documented, providing clear diagrams and troubleshooting guidance for ignition, charging, and lighting systems. Important maintenance intervals for lubrication and periodic inspections are also included.

Troubleshooting and Component Specifications

The manual provides guidance on troubleshooting common issues and includes detailed specifications for all major components. This ensures that repairs are performed correctly and efficiently, maintaining the motorcycle's performance and longevity.

FAQ

Assess the **critical** calibration settings for the RD250. keyboard_arrow_down

2.0 mm ±0.15 mm is the specified ignition timing calibration for the RD250 at Top Dead Center (T.D.C.).

What components have **required** clearance measurements for the RD400? keyboard_arrow_down

The rear axle has a required clearance measurement of 12 ~ 18 m-kg for proper fitment.

Confirm the **specified** torque specifications for the rear brake caliper. keyboard_arrow_down

1.4 ~ 2.3 m-kg is the specified torque for the rear brake caliper bolts.

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Reviews (3)

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New
This service manual is invaluable for anyone working on their 1976-1979 Yamaha RD250 or RD400. The detailed sections on engine and chassis repair are especially helpful. I had a smooth download process, and the support team was incredibly responsive when I had a question. Highly recommend!
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Rated 4 out of 5 stars
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New
The manual covers everything you need to know about the RD250 and RD400. The instructions are clear and detailed. I appreciated the quick email response when I needed assistance with the download link. Great service!