they are a pretty rare ski indeed.. pjs made the lazerjet as well.. the viper7000 came with a pjs t1 reed induction cylinder that uses 750 reeds, has dual 40mm taperbored keihin carbs and is rated at 70hp.. they also come with a pjs "afterburner" 440 style pump.. they are a 50mph ski out of the box.. not soo much on bottom end but they are said to handle like a 750..