Okay. RC Report mentioned something a month ago or so about fixing the OS .91FX by replacing the needle valve adjustor with a K & B needle valve adjustor assembly because with the OS assembly, the engine got hot and vaporized the fuel before it got to the carb. OS says that I need to buy an O ring set to replace what they originally put in it, and a guy at my flying field said that he fixed his problem by wrapping the standard needle valve assembly threads with teflon tape.
So, is it:

A) new O rings ($7)
B) bigger fuel lines (pennies)
C) teflon tape (pennies)
D) a K & B needle valve replacement ($18)
E) I'm leaning the thing out too much (free)

or, is it any of the above?