Question A moped has an engine no larger than: Answers One-half horsepower. Three-quarters horsepower. One horsepower. Two horsepower. Explanation Under Hawaii law, a moped is defined as a two- or three-wheeled vehicle that can travel no faster than 30 mph on a level surface and that has a motor no larger than two horsepower. Take a FREE Practice Test Now This questions appears in the following tests: Hawaii Practice Test