As Joe stated above the seller must provide written proof of the supercharger rebuild. If not then plan on a supercharger rebuild. They are due every 100 hrs unless a new updated kit is used then it's 200 hrs. Compression test is a must and if that looks good then a test ride. Never buy anything without a water test. A ski can run great on the trailer and very poor in the water. Only way to find out is to water test the ski.