I have 2007 cub cadet lt1045 model # 13ax11ch756 a kohler sv600 corage engine tractor, was using it put in garage now wont start. fresh gas in it battery charged up,it started a couple of times lately now it wont, checked all wires all good. even tried new battery cranks over a few times then wont start then battery dies, new battery does same thing ,gas is pumping in to carb battery shows 12.75 volts. what else can I try thanks need help