Ah, the Suzuzki RP68 - three cylinders, 50cc, 19.5hp at 19,000 rpm, and 18 speeds in the box. Suzuki did try out the 50 triple during practice, but found the 50 twin was easier to keep in the powerband and was actually quicker around the circuit. The triple was just too peaky in its power delivery at that stage of its development. Also, it was intended to race in the 1968 season, but the FIM announced a limitation of single cylinder and six speeds for the 50cc Grand Prix, it just wasn't worth developing the bike further.
The frame and running gear fro the triple was, however, raced at the 1967 Japan Grand Prix but fitted with the old twin-cylinder motor. As far as I know, the 50 triple has not survived.
Graham.