Alaska

Motorcycle:

“a vehicle having a seat or saddle for the use of the rider and designed
to travel on not more than three wheels in contact with the ground; the term does not include a tractor.”

Motor-Driven Cycle:

“a motorcycle, motor scooter, motorized bicycle, or similar
conveyance with a motor attached and having an engine with 50 or less cubic centimeters of displacement.”

_{(Source: http://www.akleg.gov/basis/statutes.asp#28.90.990)}

	Licensing	Minimum Age	Registration	Insurance	Helmet
Motorcycle	M1	16	Required	Liability insurance required	Required for riders under 18, all passengers, and anyone with an instruction permit or taking a road test
Motor-Driven Cycle	M2 (Only for riders age 14-15; Restricted to 50cc or less) -or Standard Driver License	14	Required	Liability insurance required	Required for riders under 18, all passengers, and anyone with an instruction permit or taking a road test

_{(Sources: http://doa.alaska.gov/dmv/akol/motor.htm; https://doa.alaska.gov/dmv/dlmanual/mcman.pdf;
https://doa.alaska.gov/dmv/dlmanual/dlman.pdf; http://www.akleg.gov/basis/statutes.asp#28.10.421)}