I have not flown my RC trainer plane in 2 years. I am going to start being trained on it again soon. I have a .46 TT Pro engine in it. The leaver that is hooked to the steel rod to the servo is the leaver that opens up the carb. when I try to push on the rod to get it to push the leaver to open the carb, the carb will not open or budge. The leaver does not rotate to open up the carb. I am not sure if it is froze shut or rusted shut or just because it has not been fired up in a long time? Does anybody know what may be wrong with it, or should I go buy a new engine?