I have a John Deere LX 279 Lawn Tractor with the Kawasaki V-twin engine, and when it gets hot it shuts down just like you turned the key off. You can try to restart and the starter turns over, however the mower won't even hit. I have checked and it is indeed getting gas so I know the problem isn't fuel related. I have replaced both spark plugs, coils and ignitor pack still having the same problem. Once it cools down you can restart it and it and it will run for anything from a half hour to several hours depending on how hard the engine is pulled. Any suggestions??