1974-1978 Yamaha RD125 / RD200 Service Manual

Service Manual for Yamaha RD125 & RD200 models (1974-1978). Includes detailed diagrams and maintenance procedures. PN 507-28197-81.

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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 RD125B, RD200B, RD125C, RD125C-DX, RX125, RD200C, RD200C-DX, NR200, RD125DX, RD200DX
Sub-models / Variants: DX, 125cc, 200cc
Build Years: 1974–1978
Serial Numbers: RD125(B) 507-000101 and higher, RD200(B) 397-200101 and higher
Technical Data:

  • Engine: 2-cylinder parallel, 2-stroke, air-cooled, torque induction
  • Transmission: 5-speed constant mesh
  • Ignition Timing: 1.8 mm B.T.D.C.
  • Idle Speed: 1150–1250 rpm
  • Transmission Oil Capacity: 700–800 c.c. (RD125), 800–850 c.c. (RD200)
  • Spark Plug: NGK B-8HS
  • Final Drive: Chain (DK428)
  • System Voltage: 12V DC
Technical Specifications
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Document Number / Seller:
24574 / Emily Robinson
File Size:
54.75 MB
File Type:
ZIP
Language:
English, French, German
Printable:
Yes
Category:
Bike
Last updated / verified
Feb 6, 2025

Yamaha Manual Features & Content Preview

1974–1978 Yamaha RD125 and RD200 Service Manual

  • Covers 1974–1978 Yamaha RD125 and RD200 series motorcycles, including B, C, DX, and RX variants, with comprehensive data for 125cc and 200cc models
  • Official Yamaha publication 507-28197-81, first edition September 1974
  • Contains 47 exploded-view diagrams, 16 mechanical schematics, and 12 technical specification tables
  • File delivered as a direct download the moment payment clears
  • Indexed PDF search covers every chapter and appendix
  • Laid out for standard letter and A4 printing
  • This 1st edition is the reference used for the original RD125/RD200 launch build, documenting engine, chassis, and electrical specifications for the 507 and 397 factory series

Documentation Walkthrough

This 1974–1978 Yamaha RD125 and RD200 service manual provides structured technical data for mechanics and owners. The content begins with identification procedures, serial number location diagrams, and maintenance schedules covering ignition timing, cable adjustments, and lubrication intervals.

The document details engine tuning, top-end maintenance, and chassis adjustments for the 125cc and 200cc engines. Understanding factory workshop documentation structure aids in managing tasks from carburetor synchronization to transmission service and electrical system checks.

Technical Specification Highlights

Technical data is presented in detailed tables categorized by model variant. RD125B engine displacement is listed at 124 cc, while the RD200B displacement is documented at 195 cc. Cylinder head bolt torque is specified at 86.8–130.2 in-lbs (1.0–1.5 m-kgs) in the assembly specifications. Ignition coil primary resistance is 4.0 ohms at 20°C. Idle speed for both models is set at 1150–1250 rpm. Transmission oil capacity for the 1974–1978 Yamaha RD125 is documented at 700–800 c.c., while the 1974–1978 Yamaha RD200 requires 800–850 c.c. Reference only — always consult a certified technician before performing service on this equipment.

This is the definitive 1974–1978 Yamaha RD125 and RD200 service manual covering the 125B/C and 200B/C model lineup, documenting engine, chassis, electrical, and maintenance specifications for the factory-spec 2-stroke parallel-twin engine build.

Manual FAQ, Purchase & Download Details

Does this manual include data on fluid capacities such as transmission oil volumes or front fork oil quantities? keyboard_arrow_down

Specification tables in the manual list fluid capacities for various components including the transmission and front fork oil levels.

What content is contained within the engine and transmission chapters of this document? keyboard_arrow_down

Manual includes dedicated chapters covering engine tuning, transmission components, and clutch assembly details. These sections provide reference data and specification tables for the models covered.

Which specific technical reference tables and system-specific data summaries are available for the RD125 and RD200 models? keyboard_arrow_down

Document contains comprehensive maintenance specification tables that detail nominal values, minimum allowables, and maximum allowable limits for various systems. These reference charts cover components like the ignition system, crankshaft assembly, and braking systems. Each section is organized to provide clear lookup data for the compatible model series.

Can I view information regarding the electrical system, such as standard system voltage and component specifications, within the manual? keyboard_arrow_down

Electrical system section includes reference data for the standard 12V DC system architecture and lists specifications for components like the generator and lighting.

Is there comprehensive coverage for the different Yamaha RD model variants and production years within this service publication? keyboard_arrow_down

Manual covers a range of RD125 and RD200 models produced between 1974 and 1978. It includes identification references to help determine specific submodel application and specifications for that production period.

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