Okla. Stat. tit. 47, § 47-1-135: Motorcycle

Motorcycle.

A motorcycle is any motor vehicle having:

1. A seat or saddle for the use of each rider;

2. Not more than three wheels in contact with the ground, but

excluding a tractor; and

3. An electric or combustion engine motor:

a. if the power source is a combustion engine, an engine

with a piston or rotor displacement of one hundred

fifty cubic centimeters (150 cc) or greater, or

b. if the power source is an electric motor, with a power

source capable of producing one thousand (1,000) watts

or greater.