I've a Scag TT w/56" deck and 23HP Kohler. It starts runs 15 sec. and shuts down like I turn off the key. It ran for about 15 Min mowing. It did this 2 years ago and the shop I took got it running but didn't know what was wrong. It's getting fuel. Maybe one of the 15 safety switches??? Any help would be appriciated!! THANKS!!!!