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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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 RD125, RD125B, RD125DX
Build Years: 1975–1980
Technical Data:

  • Fuel tank capacity: 11.5 liters
  • Fuel reserve capacity: 2.8 liters
  • Transmission oil capacity: 750 ± 50 cc
  • Autolube tank capacity: 1.5 liters
  • Spark plug gap: 0.6–0.7 mm
  • Spark plug tightening torque: 2.5–3.0 m-kgs
  • Contact breaker point gap: 0.3–0.4 mm
  • Drive chain deflection: 20 mm
  • Clutch lever free play: 2–3 mm
  • Front brake lever free play: 5–8 mm (RD125/RD125B) or 13–26 mm (RD125DX)
  • Tire pressure (Normal): Front 1.6 kg/cm², Rear 2.0 kg/cm²
  • Tire pressure (High Speed): Front 2.0 kg/cm², Rear 2.4 kg/cm²
Technical Specifications
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Document Number / Seller:
23603 / Laura Scott
File Size:
32.40 MB
File Type:
PDF
Language:
English, French, German
Pages:
86
Printable:
Yes
Category:
Motorcycle
Last updated / verified
Feb 25, 2025

Yamaha Manual Features & Content Preview

1975–1980 Yamaha RD125, RD125B, and RD125DX Owner Manual Scope

  • Covers 1975–1980 Yamaha RD125, RD125B, and RD125DX motorcycles, including the specific RD125DX braking system variants.
  • Official Yamaha Motor Co., Ltd. publication P/N 507-28199-81, printed in Japan, dated February 1975.
  • Contains 6 detailed flow charts for fuel, compression, and ignition system troubleshooting.
  • Files are delivered as a direct download the moment payment clears.
  • Laid out for standard letter and A4 printing.
  • Indexed PDF search covers every chapter and appendix.
  • Full-text search finds any part number in seconds.
  • This 1975 edition documents the initial technical specifications and service intervals for the RD125 series build.

Motorcycle Operational and Maintenance Guidance

Document Content Overview

This 1975–1980 Yamaha RD125, RD125B, and RD125DX manual serves as the primary reference for owners of these classic two-stroke machines. The documentation organizes vehicle information into four distinct segments, covering exterior identification, control function operation, riding fundamentals, and periodic maintenance schedules. The structure outlines routine inspection requirements for critical systems, including the two-stroke Autolube oil tank, transmission, fuel delivery, and electrical circuit management. The text provides guidance for owners on performing minor adjustments, such as cable tension, chain slack, and braking system calibration.

Specification and Technical Data Highlights

Technical tables detail the requirements for maintaining these vintage units. Lubrication charts specify the usage of motor oil and grease for components like brake cam shafts, wheel bearings, and drive chains. Cylinder head spark plug tightening torque is documented at 2.5–3.0 m-kgs. Transmission oil capacity is specified at 750 ± 50 cc. The ignition system contact breaker point gap is listed at 0.3–0.4 mm in the ignition data section. Fluid levels for the cooling and braking systems are defined, with specific guidance for the RD125DX front hydraulic brake reservoir. Reference how factory workshop documentation is structured for additional details on this 1975–1980 Yamaha RD125, RD125B, and RD125DX series. An official 86-page Yamaha OEM owner manual covering the 1975–1980 Yamaha RD125, RD125B, and RD125DX, documenting essential maintenance, operational settings, and troubleshooting diagnostics for this classic two-stroke motorcycle series.

Manual FAQ, Purchase & Download Details

Is the 1975 to 1980 Yamaha RD125, RD125B, and RD125DX series covered in this document? keyboard_arrow_down

Yes, the manual provides coverage for the RD125, RD125B, and RD125DX motorcycle models produced between 1975 and 1980.

What information does the manual contain regarding spark plug maintenance and tightening specifications? keyboard_arrow_down

Document includes technical reference sections for spark plug electrode spacing and lists specific fastening torque ranges for the ignition system assembly.

Are there details regarding recommended fluid types and capacity levels for the transmission or fuel system? keyboard_arrow_down

Specification tables contain listings for fuel tank capacity and standard crankcase oil volume, as well as recommended oil types for transmission and engine lubrication.

Does this PDF provide tire pressure references for different riding conditions? keyboard_arrow_down

Yes, the document includes operational mapping for tire pressure that covers both normal and high-speed riding requirements.

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