Low G with a carburetor
Any float type carburetor relies on gravity for the float to work.
If the float stays at the top of the chamber it will not replace the fuel used in the carburetor as the needle valve is shut.
Try it in a frame with the same engine that is allowed to operate at zero G i.e plank C172 for example.
It happens very quickly and a plank will restart due to windmilling (if you don't get too slow) a helicopter will not unless you restart it!
Maybe the rotor on the G2 is too good for the engine!