## 1972-1973 Yamaha DS7, RD250, R5C, and RD350

Yamaha's two-stroke motorcycles of the early 1970s were renowned for their performance and engineering, and the DS7, RD250, R5C, and RD350 were no exception. These motorcycles combined advanced technology with sleek styling to create machines that were both thrilling to ride and beautiful to behold.

### Origins and Development

The origins of these motorcycles can be traced back to Yamaha's successful racing program of the late 1960s. Yamaha engineers sought to develop a production motorcycle that could rival the performance of their factory racers, and the result was the RD05A, which was released in 1970. The RD05A was a 250cc two-stroke twin with a reed valve induction system, and it quickly became a popular choice for racers and enthusiasts alike.

In 1972, Yamaha introduced the DS7, RD250, and R5C. These motorcycles were based on the RD05A, but they featured a number of significant improvements. The DS7 was a budget-friendly model that was intended for casual riders, while the RD250 and R5C were more performance-oriented models that were aimed at serious racers.

In 1973, Yamaha released the RD350. This motorcycle was a larger and more powerful version of the RD250, and it quickly became one of Yamaha's most popular models. The RD350 was used by Kenny Roberts to win the 1973 and 1974 Grand Prix championships, and it helped to establish Yamaha as a major force in the world of motorcycle racing.

### Design and Engineering

The Yamaha DS7, RD250, R5C, and RD350 were all two-stroke twin-cylinder motorcycles. The DS7 and RD250 had a displacement of 247cc, while the R5C and RD350 had a displacement of 347cc. All four motorcycles featured a reed valve induction system, which helped to improve power and fuel efficiency.

The DS7, RD250, and R5C had a single carburetor, while the RD350 had two carburetors. The RD250, R5C, and RD350 also featured a capacitor discharge ignition system, which helped to improve starting and performance.

The DS7, RD250, and R5C had a five-speed transmission, while the RD350 had a six-speed transmission. All four motorcycles had a chain final drive.

The DS7, RD250, and R5C had a tubular steel frame, while the RD350 had a die-cast aluminum frame. The DS7, RD250, and R5C had a telescopic front fork and a swingarm rear suspension, while the RD350 had a telescopic front fork and a monoshock rear suspension.

The DS7, RD250, and R5C had drum brakes front and rear, while the RD350 had disc brakes front and rear.

### Performance

The Yamaha DS7, RD250, R5C, and RD350 were all capable of impressive performance. The DS7 had a top speed of 70 mph, while the RD250, R5C, and RD350 had top speeds of over 100 mph.

The DS7, RD250, and R5C had a power output of approximately 25 horsepower, while the RD350 had a power output of approximately 35 horsepower.

### Styling

The Yamaha DS7, RD250, R5C, and RD350 were all stylish motorcycles. The DS7 and RD250 had a similar appearance, with a rounded headlight, a teardrop-shaped fuel tank, and a stepped seat. The R5C had a more aggressive appearance, with a square headlight, a larger fuel tank, and a racier seat. The RD350 had a similar appearance to the R5C, but it had a larger engine and a more powerful exhaust system.

### Impact and Legacy

The Yamaha DS7, RD250, R5C, and RD350 were all significant motorcycles in Yamaha's history. These motorcycles helped to establish Yamaha as a leading manufacturer of high-performance two-stroke motorcycles, and they played a major role in Yamaha's success in Grand Prix racing.

Today, the Yamaha DS7, RD250, R5C, and RD350 are highly sought-after by collectors and enthusiasts. These motorcycles are a testament to Yamaha's engineering prowess and their timeless beauty.

YAMAHA DS7 - RD250 - R5C - RD350 1972 - 1973 SERVICE REPAIR MANUAL SCANNED
113 pages

SERVICE REPAIR MANUAL
The manual what will be send to you will contain all the necessary needed instructions for all the repairs of your bike from front to the back.
The same manual is used by your garage or workshop to repair your bike.
So you could save you a lot of money with this manual, it will give you all the technical information what is needed to get your bike in 100% running condition.
You will find illustrations, diagrams technical specifications, depth illustrations and step by step explanations how to do the job, even if you don't have much knowledge about bikes this could be understood with some basic mechanical knowledge to servicing safely and easily your bike.
CONTENTS OF THE REPAIR MANUAL
-MAINTENANCE
-ENGINE OVERHAUL AND REBUILDING
-TROUBLESHOOTING AND DIAGNOSTICS
-CLUTCH
-COOLING SYSTEMS
-FUEL & EXHAUST
-IGNITION & ELECTRICAL
-SUSPENSION
-WHEELS & TYRES
-STEERING
-FRAME AND BODYWORK
-TRANSMISSION
-FIRING ORDERS
-DETAILED SPECIFICATIONS COVERED
-TIMING BELT SERVICE PROCEDURES
-BRAKE SERVICING PROCEDURES
-COMPLETE TORQUE SPECIFICATIONS
-REPAIR PROCEDURES
-COMPLETE WIRING DIAGRAMS
AND MUCH MORE.

All the files can be printed out individually.
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