Try a new spark plug. The plugs that come with those engines are junk. Its recommended on a brand new Chinese engine that you throw the plug away and replace it before you ever start it. They're that bad.
If its a resistor plug, they can actually be bad internally and affected by heat. Its worth a shot and a cheap fix if that was the problem.
If its a resistor plug, they can actually be bad internally and affected by heat. Its worth a shot and a cheap fix if that was the problem.