The Kawasaki Watercraft ULTRA LX is powered by a four-stroke engine, specifically the Kawasaki four-stroke, 4-cylinder, DOHC, 16-valve, liquid-cooled, fuel-injected engine. This engine can produce up to 160 horsepower, making it one of the most powerful engines available in personal watercraft. The ULTRA LX is also known for its impressive fuel efficiency, with some models capable of traveling over 100 miles on a single fuel tank.