Whether or not you're a motorcycle fan, or a Honda fan for that matter, it's hard to deny the impressive nature of what Honda accomplished with the RC166. The RC166 produced 62 horsepower, attained a top speed over 150 mph, and did this with a motor displacement of just 249cc., normally aspirated.
That's less than 1/10 the displacement of your average modern-era Mazda 3. To help identify that scale, consider a 12 ounce bottle of your favorite beverage is 355 cc. Drink about a third of it, and what you're left with in your bottle is the displacement of the RC166. And all this in an era without computers, which means no computer-based machining equipment either.