RE: Converting RC engines to Control Line
There is a source. See if you can find it with Google. I think it was Stuka Stunt or someting like that. The TH 40 was the more favored of those. The ST 40 is rather highly tuned and will tend to break out of 4 cycling and run away in a lean 2 cycle on you. The K& B's tend to be that way also.
Enjoy,
Jim