Hi Dave

I have a new 91AC (it has the woodrif key on the crankshaft) and I am having flameout problems with it. It has had less than one gallon of Wildcat 20/20 through it. I have it mounted sideways and I have a 14x10 APC prop on it. I'm getting around 8900rpm on the high end and 2000-2100 on the low end. The regulator is flush with the body.

So here's my problem. Whenever I go inverted or point the nose up, the engine flames out. It doesn't seem to speed up as if it were lean, it just dies. I checked the clunk in my tank and I am sure that's not the problem. I'm at a loss as to what the problem might be. Any ideas would be greatly appreciated.

Thanks
Chris