Okla. Stat. tit. 47, § 1-136
Motor-driven cycle.
Every motorcycle and motor scooter, equipped with a motor which produces not to exceed five (5) brake horsepower at full throttle without a governor as determined by a dynamometer test and designed to travel on not more than three wheels in contact with the ground.
Laws 1961, HB 556, p. 317, § 1-120, eff. September 1, 1961; Amended by Laws 1978, SB 521, c. 304, § 3; Amended by Laws 1981, HB 1039, c. 103, § 2; Amended by Laws 1985, c. 305, § 10, emerg. eff. July 24, 1985.