Had a J3 with a continental engine that did the same thing. I think two 
things happen first the fuel in the header tank goes to 0 G.s ie it 
floats and 2nd the fuel in the carb also just floats and fuel induction 
is interrupeed thus fuel starvation to the engine results. Thats why 
airplanes that fly at unusual attitudes are fuel injected or have 
pressure carbs. Don't think Continental or URCO had such in mind when 
the coupe was designed

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