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!
You have two, OPC switches, one on each side. My thought is one of these switches is cutting off the magneto, as soon as you restart, it is set again. There is no reason the fuel would come and go, so I think you are loosing spark. See the diagram above.
I see question is still open, did you find solution?