Never have said what the plane is and what 1.20 you had on it. Are you looking for a two stroke or four stroke for the new power plant, gas or glow? How did you like the mystery 1.20 in this plane. Are you looking to 3-D the plane with a new engine or fly the IMAC pattern?? I like .91 two strokes in my 60 size stunt planes but have gone to the 1.08. The little Zenoah 20cc or RCS 1.40 are pretty good choices in gas power and the .91 to 1.20 are pretty good choices in four strokes. The YS 1.10 could be the killer engine for you?? CG, we really need that chart!!!