poppy2, Use your heat gun to free up the carb barrel. Keep the direct heat away from the plastic throttle lever and on the metal carb body. It will free up when it gets hot and then you should oil it with after run oil and rotate it a few times. Remove the glow plug and add a little after run oil to the inside, rotate everything to move the oil around and then fire up the engine, run it for 4 or 5 mins in a test stand or in the plane if it is in one. It should be free as a bird now, so just reoil the carb and piston area and it is ready to go flying. Use Dawn Power Dissolver/Dawn Grill Cleaner (same stuff) to clean the outside so they look like new.