I have a 6 hp briggs & Stratton on my power washer ,it starts up fine and runs really good but for only 10 mins, I checked gas cap , carb air filter and plug
#2
EngineMan
Did you also check to see if it had a spark at the plug when it stop.
Did you check to see if there was fuel still in the carburetor when it stop, (right level)
It will help you if you post the numbers that are on the engine.