Okla. Stat. tit. 47, § 47-1-133.2: Moped

Moped.

A "moped" is any motor-driven cycle with an electric or internal

combustion motor which produces not to exceed two brake horsepower

and which is not capable of propelling the vehicle at a speed in

excess of thirty-five (35) miles per hour on level ground. If an

internal combustion engine is used, the displacement shall not

exceed fifty cubic centimeters (50 cc), and the moped shall have a

power drive system that functions directly or automatically without

clutching or shifting by the operator after the drive system is

engaged. If the power source is an electric motor, the motor shall

not exceed seven hundred fifty (750) watts.