go to your local parts dealer and ask for a carb rebuild kit for that specific model carb...
I have an 82 prospector with the carter thermoquad, at least I did anyway (before I rebuilt the entire thing) and when I tried to do a rebuild on it, the engine went from running half ass to never properly running ever again. Since that incident, I've replaced my entire engine, manifold, carb, the works and I think, you might just be better off replacing your carb for a new and improved version... if you're anything like me when it comes to gettin' those intricate devices put back together right, I just suck...
my .02
Chief