IN DETAIL:
During the no-holds-barred era of Grand Prix racing in the 1960s, Honda went the air-cooled four-stroke route with more cylinders, more rpm and more gears, Suzuki andYamaha pushed the water-cooled two-stroke envelope with multi-cylinders, disc (rotary) valves and yet more gears.
The madness had to end, and it did with rule changes limiting the number of cylinders and gears depending on class capacities.The changes gave birth toYamaha’s potent over the counter 250cc and 350cc race bikes, and Suzuki’s XR14s (factory version
