First thing I would do is take the carb off and rebuild it. Then check that the fuel pump is in working order. An easy test to disagnose fuel pump is to have someone continue to prime the engine with the fuel bulb and start it. If it will run from priming but stops once you stop priming then its a bad fuel pump. These fuel pumps can be taken apart and cleaned/rebuilt with a kit but be very careful to orient the parts back in place correctly. If the orientation is wrong in any way the pump will not work. Also like many of the previous posters said check spark plug and gap. These little engines are bulletproof. On the several of them I have owned over the years it has 9 times out of 10 been a dirty carb.
