Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Load bang when running and quit? Is engine cranking now, but will not start? Remove spark plug and see if the spark plug is damaged. Feel into the cylinder with a probe and see if the piston is moving, if you turn engine by hand, If piston is not moving, you have busted engine!
I see where question is still open, did you find problem?