Kenny Roberts was the prototype dirt-track rider who become a successful Grand Prix rider, and he was in turn followed by many others. The bikes were as amazing as the riders. They were powered by very light two-stroke V-4 engines that were pushing 200 very peaky horsepower.
The tires of the day weren't really up to the task of maintaining grip consistently. The frames weren't ready for the forces they had to deal with. And at the time, there were no sophisticated electronics to cut engine power in turns or for launching off the start line. A heroic time really.
The video trailers below capture a sense of how vicious these powerful motorcycles were, and how awesome the guys were who rode them at (and over) their limits.
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