The Research & Development team at Suzuki has it's sights set on the perfect 125cc.
Honda had a new four-cylinder developed known as the RC 146. Suzuki then assumed that two cylinders would not be enough to win with in the future. Immediately following the 1963 Japanese Grand Prix Suzuki began the development of a square-four, water cooled engine, internally called RK64. But the development of the machine wasn't finished until the season was already over. The completed engine design was turned in on December 2, 1964 and first engines would hopefully be built in February of 1965.
Then the development team changed the name to RS 65. The bike still some technical difficulties, including sky-high oil temperatures. After a month of frustration it was decided to start with a new direction, the three-cylinder RJ 66 , which one would start in November of 1965. The old racer, the water-cooled two-cylinder, was now called the RT 65. Confused yet?
1963, '64 and '65 Japanese 125cc GP's had Suzuki feeling like it could keep the title forever. There appeared only one cloud on the horizon: Yamaha had a water-cooled version of the RA 97 made.
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