didnt take long, first don't heat anything up with any flame!!! second it is 88$ to replace that engine from towerhobbies not to bad in case it is bad, if I was going to do that I would get a OS 46AX for 115$ but thats just me.
first looks as though the carb has a nut on the end of the shaft opposite the lever take some oil 3in1 is fine sewing machine oil is good or some fuel and just gently wiggle the barrel loose then rotate the lever until it feels smooth just don't manhandle the thing to break it free, you don't want to break the carb body.here is a shot of a OS 46 the nut on the carb side is by the lever yours should be opposite the lever, just use a small wrench to lightly wiggle the barrel until it loosens