Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Engine dies from either loosing spark, or loosing fuel.
You either have a bad ignition coil, or the fuel solenoid in the base of the carburetor is getting hot and cutting off the fuel.
Does it get where it will not start? If so, check fr spark at the spark plug. And the fule solenoid can be checked by listening or feeling it when key is turned on and off. It has to retract as soon as the key is turned on, and has to stay retracted or engine dies.
Did you find the problem?