btw, it's not uncommong for inverted 4-strokes to not idle well, the problem is usually the plug getting cold. A lot of guys fix the problem with an onboard glow that kicks on at idle, there are even some new spiffy ones that sense the plugs temp and apply heat when needed regardless of throttle. I wonder if a hotter than normal plug might not also help, after all, there's nothing really magical about 4-stroke plugs that require that they only be used in 4-strokes or that 4-strokes can only work with 4-stroke plugs. It does usually work out best that way, but you never know. I haven't tried yet. Ask me again in a few months, I'm putting togther a Kyosho Tiger Moth with an inverted OS .52FS. Never enough time to get working on it though.

I've never heard anything bad about spacewalkers, everyone I know who's had one, and every mention I've seen on line about them has been positive, that's gotta mean something.