2013 ORS § 801.365¹
Motorcycle

Motorcycle means any self-propelled vehicle other than a moped or farm tractor that:

(1) Has a seat or saddle for use of the rider;

(2) Is designed to be operated on the ground upon wheels; and

(3) Is designed to travel with not more than three wheels in contact with the ground. [1983 c.338 §63]