Three different KS cars raced in the 1979 Japanese F3 Championship, they were the 06B, 06C and 06X, the O6C was Toyota powered, the 06X had a Honda and no engine is listed for the 06B. The best result was achieved by Osamu Nakako in the 06C with a third at Tsukuba but after this the car disappeared. The 06X only did one race and finished seventh at the opening round at Suzuka.

Naoki Nagasaka (06B), Osamu Nakako (06C), Yoshiyuki Ogura (06X).