Why does your go kart stop running when it gets hot?

Answer 1

replace the radiator. There are a lots of cause why a car stop and running hot. First, your car might have damage head gasket. Second, it might have a worned thermostat and you might need to replace the water pump.

Answer 2

It depends but probably yes. ---- It may be due to a vapor lock. This occurs when gasoline, either in the fuel line or in the carburetor turns into vapor. The vapor arriving in the cylinder is too lean to burn. Try protecting the fuel lines and carburetor from engine heat.