If this is an older model engine , it may have points & condenser . You can change them or get an electronic ignition module to update your engine. On the points & condenser , the condenser gets very hot ! Thats why it will restart after a cooldown period ! Get the new parts , it comes with instructions . Good Luck !
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Given the fact that you offer absolutely NO information about what "IT" is, I am going to guess at a solution for you.
I am assuming that you have a one cylinder Briggs and Stratton engine
mounted in a riding lawn mower that sounds like you are dealing with a
defective ignition armature, commonly know as the coil. You can verify
this by obtaining an in-line spark tester, the kind with a neon bulb
that will show a visible spark while the engine is running,
Insert your tester in the spark plug wire and connect it to the spark
plug, start the engine and run it until it "shuts off". Immediately try
to restart it while watching the spark tester for a visible sign of spark. If you see no light flash or a very weak looking light in the tester, replace the ignition armature/coil.
The two most likely suspects for the symptom you describe are:
a) Ignition coil failure under high heat.
b) Decompression failure due to normal wear.
For a positive diagnosis try the following:
For scenario a)
Run the engine until it shuts itself down. As quickly as possible, check for spark using a spark tester (availabe at local auto parts store). If no spark when hot, allow to cool down and test again. If good spark when cold and no spark when hot, change the ignition coil.
Proper part number (assuming your machine is still all original) Briggs & Stratton part #492341.
For scenario b)
Run the engine until it shuts itself down. Try to restart but pay close attention to the speed of the spinning starter. Next, remove the spark plug and spin the engine over (WITH SPARK PLUG WIRE WELL OUT OF THE WAY!!) If the engine spins super fast and free you can discount the theory of a bad battery and you will need to adjust the valve lash.
Determine which is the case and reply to this post. I will gladly give a detailed explanation of the valve lash adjustment procedure in another post.
When it shuts down crack the fuel cap and listen for the woosh of a vacuum on the fuel tank. If you hear this, clean the pinhole vent in the fuel cap, or replace it. Being partially plugged would cause you to be starved for fuel and could explain your issue, and why it goes away after a period of time.