hey, my supersports 40 with an OS 46 has been sitting for 3-4 months. I took it to the field recently, spent 10 min. tunning it for best perf, and attempted taking off with no luck. It barely had the power to get off the ground, and when it did it stalled and went down. This happened several times until i eventually gve up for the day. Could the carb be gummed up from sitting? is there something else i should look at ??