I have a 19HP Kawasaki engine on an Exmark Zero-turn that has been super until now. After running on several cuts it will just quit from high throttle. It acts like it is getting hot. I will have to wait 5-10 min before it will restart. Both engine coils were replaced last year. The fuel filter visually looks OK with fuel in it. It now has 1500 hrs. but I would like to keep it if possible without too much repair work. It has never died from low throttle. Does anyone have any ideas of when to start? Are there any low cost overhaul items that would be worth doing? Thank You in advance.