Have a YS-120NC mounted inverted problem. Using two YS-120NCs mounted inverted in a Tiger moth I'm having problems keeping them running when I come off of an installed glow driver setting.

wonder if it is because my tank centerline is 2" above the YS-Inlet? Both engines worked fine in a fusledge center mounted tank and the engine inverted. Ran into a man in NJ that has to keep glow on in his YS inverted all the time.

Any answers or suggestions?