After replacing the fuel tank and fuel lines, I flew my H9 J-3 40 Cub PNP yesterday. The engine did not quit at full throttle this time. At times it would slow down and speed up a little bit at full throttle, but not nearly as much as before. I ran the engine pretty rich. Maybe I just need to be patient with the engine and let it get through the break-in period.

Thanks!
Bjfrankl