RE: Good tip for inverted engines ;)
Amen brother... I started using an OS "F" and have had exceptional performance inverted. Saito FA150 2100 at idle and 9100 high end with a 16X6. I didn't bother to lean it out any more. I can get vertical on takeoff with no worries about sputter. When I put the F type in and it was like getting a different engine.