A Selection of California Vehicle Codes for riding motorized scooters:
Section 400-407.5 of the California Vehicle Code:
Section 400: Motorcycle: having a seat or saddle and traveling on not more than 3 wheels and less than 1500lbs.
Section 405: Motor Driven Cycle: a motorcycle with less than 150cc.
Section 407.5: Motorized Scooter: (A) A “motorized scooter” is any two-wheeled device that has handlebars, has a floorboard that is designed to be stood upon while riding, and is powered by an electric motor that is capable of propelling the device with or without human propulsion. This device may also have a driver seat that does not interfere with the ability to stand. For purposes of motorized bicycle or moped, as defined in section 406, or a toy, as defined in section 108550 of the Health and Safety Code, is not a motorized scooter. (B) A device meeting the definition in subdivision (A) that is powered by a source other than electrical power is also a motorized scooter.
A Class C license includes: (B)(3)(H) motorized scooters; (B)(3)(I) does not include motorcycle or motor-driven cycle.
So there you have it.