I have a RC10 GT and the engine has had this problem for a while, but im just now getting around to fixing it. Whenever I start it up (using a pull start) as soon as it starts the engine revs to the point where it is smoking within 3 seconds. I tried adjusting the idle speeds and the fuel mixture screws. I checked the carb as well. Any ideas as to how to fix this problem or at least what the problem is?