Was running just fun stopped tried to start but wouldnot stay running replaced spark plug and replaced gas, changhed oil too. Still nothing, what could be the problem. Please help.
[ CLEANED CARBURETOR TOO ]

Hi,
Putting a bit of gas into the throat of the carb will see if it is fuel related. If it has an anti-backfire solenoid on the bottom of the carb, it may not be opening.
It could be that heat rising off the hot engine finished off the armature. Check the fuel part first and proceed from there.
Peace,
Clarke