My engine is only one piston, when it is running and I stopped it, after I stop it I can't stat it immedaitly it doesn't run mean it doesn't have the compression I can drive it without compressing the intake vale but if I wait for a few minute it can run simple.so how can i repair it?

It is running too lean on fuel. The cylinder head temperature is too high causing the fuel to vaporize upon entering the combustion chamber during hot restart of the engineif it is a gasoline engine there will be a high engine rpm air/fuel mixture adjustment screw on the carburetor which you can adjust in small increments both clockwise and counterclockwise until the engine achieves its highest rpm. Once that setting is determined adjust the screw counterclockwise until a noticeable rpm drop is apparent while still giving good engine performance and smooth running. That should fix it. It is running too lean on fuel. The cylinder head temperature is too high causing the fuel to vaporize upon entering the combustion chamber during hot restart of the engineif it is a gasoline engine there will be a high engine rpm air/fuel mixture adjustment screw on the carburetor which you can adjust in small increments both clockwise and counterclockwise until the engine achieves its highest rpm. Once that setting is determined adjust the screw counterclockwise until a noticeable rpm drop is apparent while still giving good engine performance and smooth running. That should fix it.