I had this same problem. Make sure fuel Cap is not too tight. There is three grooves on the backside of cap to let air in tank but if you tighten cap to hard it crushes these grooves to a tight seal. When vacuum in tank finally reaches same level as carburator suction then fuel flow stops and engine dies. When putting gas cap on just give it a spin and then maybe a 1/4 turn just to snug it. Next time it stalls take gas cap off and you should not hear air gushing in. If you do your cap was too tight and it will now start right-up.
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