Yes you can run it for 15 seconds or less, then must cool for several hours. Regardless of whether you hook up water or not you will have to refog engine. If you do hook up water, remember start ski then turn on water -- turn off water, blip the throttle couple quick times and shut off ski. If you purchase the ski and after your long ride wait about another hour (total 3 hours or so) start ski with nose as high as you can get it and blip throttle, again not running it for more than 10-15 seconds. Then in a day or 2 refog the engine.
Just look threw the last couple thread pages in this section for winterizing process. There's lots of them
Best of luck on your purchase.