The owner says the Kawasaki Ultra 310R has without a doubt, one of the most violent launches of a modern supercharged personal watercraft available today. From a near-standstill, the Ultra 310R roars out of the gate, it's supercharger whining at an ear-splitting pitch. This barely used speedster will leave you with an exhilarating ride and thrills a minute. This fast ride the deepest draft of any of the full-sized supercharged runabouts. While this costs the 310R a little in the top speed category, it definitely benefits the machine by giving it tremendous stability, particularly at spee...