1972-1973 Yamaha RD250, RD350, DS7, R5C Service Manual

Yamaha RD250/350/DS7/R5C Technical Service Manual

• Built for owners and workshops maintaining the 1972–1973 Yamaha RD250, RD350, DS7, and R5C two-stroke motorcycle series
• Official Yamaha publication P/N SVM-360-0800-20, originally published in September 1972
• Contains 51 exploded-view diagrams, 15 system-layout drawings, and comprehensive electrical charging circuit diagrams
• Delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Suitable for printing individual sections for shop-floor use
• Permanent availability in your purchase account — no re-buy required
• This 104-page service publication is the authoritative document for the 5-port cylinder and torque induction reed valve engine systems used across these Yamaha models

Engine and Chassis Documentation

The 1972–1973 Yamaha RD250, RD350, DS7, and R5C service manual provides detailed data on the two-stroke engine architecture. Chapters detail the Yamaha Autolube automatic lubrication system, describing pump stroke checking and oil flow adjustment. The document covers the 5-port cylinder induction system, including torque induction reed valve assembly, and internal engine components such as crankshaft assembly, transmission shifting, and kick-starter mechanisms.

Additional sections document chassis maintenance for the 1972–1973 Yamaha RD250, RD350, DS7, and R5C. The guide details disc brake hydraulic system construction, including master cylinder, caliper piston, and brake hose specifications. Steering head ball race maintenance and front fork inner tube service are described, alongside tire inflation recommendations for varying riding conditions and speeds.

Electrical and Specification Highlights

Electrical system coverage documents the alternator, regulator, and rectifier circuits. Regulator resistance values for various test points are listed in tables for diagnostic reference. The manual provides detailed torque specifications, including bridge bolt values of 60–100 kg-cm and cylinder head tightening at 180 in-lbs (2 kg-m). Tolerance charts list minimum pump stroke at 0.20–0.25 mm and piston clearance at 0.040–0.045 mm. How factory workshop documentation is structured provides further insight into maintenance standards. All service data is for reference only — qualified technicians and original OEM documentation remain the authoritative source for any hands-on work. This official 104-page Yamaha publication covers the 1972–1973 RD250, RD350, DS7, and R5C, documenting engine, chassis, and electrical specifications essential for the restoration and maintenance of these two-stroke machines.