I figure I'd also post in here as I have a similar issue with the Helix. I spend half the time out there with the kart trying to get the idle right. Right now the air mixture screw is only half a turn from completely closed...which probably isn't right but it seems to have the steadiest idle around there. What happens is the idle is not steady at all, it'll hold for about a second or two, then sputter down and struggle to keep running, then regain its idle and continue in this pattern. The idle is much like a roller coaster effect, so to speak. Perhaps it's the spark plug? Maybe the air lines need cleaned out? As with johnnyjaws I am at sea level in NY also.
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