I have a brand new XT1 with a 24hp V Twin Kohler (less than 7 hours of use). It will now sputter and die. I can immediately choke and restart. It runs for about 1 minute, then dies again. When it's running it sounds great, mows great. It does not matter if the blades are engaged or not. I also tried choking it when it starts sputtering, but that didn't help. A couple of times it sputtered to almost dying, then recovered to a full run. Most of the time, though it just dies. I can't imagine a fuel filter issue on a brand new tractor, but it does sound fuel related.