starts, runs for awhile and when it gets hot...shuts off

Not knowing exactly what model you have, I would guess that you are having a fuel issue. It is possible that you are getting a vapor lock. The fuel evaporates when the fuel lines get to hot. Make sure that you route them away from the engine block etc. Also reevaluate your ignition system, make sure that it does not get to hot. Take a look at your spark plug and see if it burns the fuel okay. Lsst thing I can think off is make sure that your gas cap is vented. There should be little holes in it, so that it will not create a vacuum. I believe that craftsman uses gas caps with washers underneath to vent the tank. Use an older one, it works better. Check all your fuel lines and delivery system to make sure they are not clogged, bend or otherwise damaged. Good luck

go buy this fuel filter and call me in the morning. lol part # 25-050-21-S it is a 75 micron filter not a 50 or universal.

Replace ignition coil

"First check fuel cap venting

Then Valve clearance.

Runs OK when cold. When hot, valves open due to thermal expansion and insufficient clearance. This causes loss of compression until engine cools.

Regards"

I had more than one problem. There is a fuel filter that looks like part of a ball point pen that is pushed into the gas tank outlet nozzle. I pulled it out with needlenose pliers and cleaned it. It ran much longer but died when it was warmed . Next I adjusted the valve lash. After 3 pulls it ran like it was trying to die, then ran great and after about five minutes, died. I am going to adjust them again tommorow. If you have fuel and your mower dies when it is warmer up, you are probably looking at the valve issue you see above; hot valves don't close fully because of lack of clearance. There may be something else worse on my mower going on. If I fix it, I will post the solution.