Btw, do you use a fuel filter in between the tank and the carb? If not, do you use a filter in between the fuel jung and tank when you fuel the airplane? Do you keep your fuel gallon sealed and work to keep dirt out of the lines espeically the end of the line when you're plugging and unplugging it from the model to fuel? I've seen (and done myself) situations where there's a lot of solid junk (dirt, plastic bits, etc) in the fuel that keeps finding it's way in to the carb and blocking the needle and/or spray bar. It can be really hard to figure out what's going on, since you clean it out, it seems to run better for a moment, then clogs back up. Also, if you are using a filter on the plane, try back-flushing it, it could be blocked. I've had that happen as well. (showed me how well the filter was working as well...)