This comprehensive Yamaha DS7(72) RD250(73) R5C(72) RD350(73) Repair Manual covers models produced in 1972 and 1973. Spanning 113 pages, the manual delves into the intricacies of these motorcycles, providing detailed instructions for repair and maintenance.

The manual begins with an explanation of the Yamaha Autolube system, its features, and the operation of the oil pump. It then dives into the nuances of cylinder porting, including a detailed description of the 5-port cylinder, the construction and features of the Torque Induction System, and the 7-port Cylinder Reed Valve System. The manual also provides a thorough explanation of the Yamaha Reed Valve and its role in the Torque Induction System.

Moving on to the engine, the manual guides you through the processes of removing the engine, cylinder head, cylinder, piston pin, piston rings, piston, crankcase cover, clutch, primary drive gear, drive sprocket, and splitting the crankcase. It also covers the crankshaft, transmission, kick starter, shifter, tachometer gear, bearing removal, carburetor, and air cleaner.

The manual then shifts its focus to the chassis, covering the front wheel (R5C, DS7, RD250), front wheel (RD350), rear wheel disc brake (RD350), tire replacement, rear wheel sprocket, tire inflation, front fork, rear cushion, fuel tank, rear arm, and steering head.

The final section delves into the electrical system, providing comprehensive information on the charging system and ignition system.

To complement the technical details, the manual includes conversion tables, a parts order system, and detailed circuit diagrams and cable routing diagrams. This manual is a valuable resource for owners and mechanics seeking to maintain and repair these classic Yamaha motorcycles.

The Yamaha DS7, RD250, R5C, and RD350 were all iconic motorcycles produced by Yamaha in the early 1970s. They were part of a wave of two-stroke performance machines that revolutionized the sportbike scene. While each model had its unique features, they shared a common heritage, boasting powerful, high-revving engines, lightweight construction, and an emphasis on performance. The DS7, introduced in 1972, was a 125cc sports bike designed as a practical and affordable entry point into the world of Yamaha performance motorcycles. The RD250, also launched in 1972, stepped up the game with its 247cc parallel-twin engine, delivering impressive power and handling. The R5C, introduced in 1972, was a more street-oriented version of the RD250, featuring a more comfortable riding position and a focus on day-to-day practicality. The RD350, launched in 1973, was the flagship model, featuring a powerful 347cc engine that pushed the boundaries of two-stroke performance.

These motorcycles were known for their exhilarating performance, responsive handling, and iconic styling. The distinctive "Yamaha" branding, the sharp lines of the fuel tank, and the aggressive stance of the machines made them easily recognizable on the road. The DS7, RD250, and RD350, in particular, were highly successful in racing, garnering podium finishes in prestigious events like the Isle of Man TT and establishing Yamaha as a force to be reckoned with in the world of motorcycle racing. While no longer in production, these motorcycles continue to be cherished by enthusiasts thanks to their historical significance, their impressive performance, and their timeless design. The Yamaha DS7, RD250, R5C, and RD350 remain iconic examples of the innovative spirit and design ingenuity that have defined Yamaha motorcycles throughout history.