2018 Kawasaki ULTRA 310LX, The cornerstone of any flagship craft is power. The 2018 Kawasaki Ultra 310LX ‘s 1,498cc four-cylinder engine is fitted with both supercharger and high-volume intercooler to develop tremendous power, whether out of the hole, through the midrange, or at top end. In terms of pure horsepower rating, it remains king at 310 hp. And at every step of the way, it feels it. Yank the throttle and your arms feel an instant stretch as the craft leaps forward with tenacity. Top end varies depending on rider and conditions, but confidently hits the 67 mph mark before electronic limiting comes into play. Reliability is long proven in the toughest of conditions. Ultras are regulars in offshore racing circles for good reason.