I'd like to ask a related question here. I recently built a plane with an inverted Saito .30, which has an air bleed idle circuit. It runs perfectly right side up, but is realy fussy when inverted. With such a small plane, an on-board glow driver is out of the question. Should I just admit my mistake and install a two stroke engine, or install a Magnum 30 four stroke that has a two needle carb, or keep running the Saito until it's good and loose? It only has about 45 minutes running time. Tank centerline is right on the carb centerline. I've tried OS F, Fox Miracle, and whatever Sig sells as a four stroke plug, all with the same low speed flooding problems.