ORIGINAL: zippytoall
I have one inverted two stroke, a ST 90, all I did was lower the fuel tank below the carb line and I also run a 4 stroke plug in it. I have yet to have any problems with it. I know a lot of people that will run on board glow for them. You can try lowering your fuel tank and this should stop the gas from pouring out of the carb.
Why do you have to use a hotter plug, just because the engine is inverted? To get a easier start? When the engine is running, the right plug is the right plug, inverted or not