WELL YOU GUYS ARE DEFFIENETLY WRONG!! many inverted TWO STROKE engines give plenty of trouble FULLY INVERTED regardless of fuel tank configuration. SOME dont run well even at 45 deg. you are trying to argue against plenty of experience over the years with people who have tried it AND FAILED. ask Clarence Lee , ask any of the engine experts. changing fuel tank position may help at one throttle position but it will also affect overall running as the tank runs dry.It has nothing to do with the carb anyway , the plug gets drowned with excess fuel. since you want to play semantic "games" here we're talking transition not just idle or full bore.Four stroke & gasoline engines spark works fine but not T/S. as far as you having plenty of these of these "rare engines"- BULL . its one thing to say it on the web , practical experience is another story.IF AND ONLY IF its well well broken in it may run but transition will suffer to some extent .it has to. if your so confident of your engine in this situation why bother with an ignition assist if its so good?? it wont make any difference (in your opinion) - SOME engine may tolerate this condition better than others but its not recommended and for good, solid, experienced based reasons. you cant help but have problems .& control line is not RC. the controlline engines in that configuration are nearly always started upright with the plane inverted , GEE, I wonder why???