RE: inverted engines
CGRetired,
I have found that running a long fuel line from the tank to the carb and making sure it rises above the level of the top of the tank will help with siphon problems a bit. All of my glow suff is Saito, but I think most 4 strokes would behave in a similar fashion.
I know it won't help much, but it has allowed me to avoid some tuning problems and siphon issues. I flat-out refuse to run OBG or anything else that may add weight.
Just a side note, I guess.
(We now return you to your regularly sheduled thread, already in progress.)