## **Yamaha YDS RD YM YR Series 250CC 400CC 2 STROKE TWINS 1965-1978**
The Yamaha YDS RD YM YR Series 250CC 400CC 2 STROKE TWINS 1965-1978 are legendary motorcycles that have left an indelible mark on the history of motorcycling. These powerful and agile machines were the brainchild of Yamaha's brilliant engineers, who sought to create motorcycles that were both exhilarating to ride and technologically advanced.
**Pioneering Engineering**
The YDS RD YM YR Series was the first of Yamaha's 2-stroke twins, and it set the benchmark for all that followed. These motorcycles featured a number of innovative engineering features, including:
* **Air-cooled Parallel Twin Engine:** The heart of these machines was a compact, air-cooled parallel twin engine. This design provided excellent power and torque, while keeping the motorcycle lightweight and nimble.
* **Reed Valve Induction:** The engines employed a cutting-edge reed valve induction system, which improved fuel delivery and efficiency. This resulted in increased power and responsiveness at all RPMs.
* **Oil Injection System:** These motorcycles were equipped with an advanced oil injection system, which automatically lubricated the engine. This system eliminated the need for pre-mixing oil with fuel, and ensured that the engine received a consistent supply of lubrication.
**Impressive Performance**
The YDS RD YM YR Series was renowned for its impressive performance. The 250CC models produced around 26 horsepower, while the 400CC models generated a staggering 34 horsepower. This power allowed these motorcycles to accelerate quickly and reach high speeds.
In addition to their straight-line performance, these motorcycles were also exceptional handlers. Their lightweight chassis and agile handling made them a joy to ride on winding roads. The suspension was well-tuned, providing a comfortable ride even on rough surfaces.
**Iconic Styling**
The YDS RD YM YR Series was not only technologically advanced, but also visually striking. These motorcycles featured a timeless design that is still admired by enthusiasts today.
The most distinctive feature of these motorcycles was their large, round headlight. This headlight gave the motorcycles a menacing appearance that set them apart from their contemporaries. The fuel tank was sleek and aerodynamic, and the side panels were adorned with stylish Yamaha decals.
**Legacy of Innovation**
The Yamaha YDS RD YM YR Series 250CC 400CC 2 STROKE TWINS 1965-1978 were more than just motorcycles; they were works of art. These machines represented the pinnacle of Yamaha's engineering and design capabilities, and they played a major role in shaping the future of motorcycling.
Today, these motorcycles are highly sought after by collectors and enthusiasts alike. They are a testament to the ingenuity and passion of Yamaha's engineers, and they continue to inspire riders around the world.
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