I got a kholer 15 HP craftsman. A few weeks ago I drained it to put it away for the winter but I decided to take it back out. It wouldn't start. The starter worked but it wouldn't turn over. The pre filter was dirty so I cleaned it but that had nothing to do with it. Anyway after a while of trying it if started up perfectly and has been working since. I dont know if I did something or not but I was wondering if anyone knows what might have happened. Now I think that there was old gas left in the Carb and it had to pass through before getting to the fresh gas. If you know, please reply. This is the first winter I have had to store the tractor.