Thanks for the responses. The Saito engines seem to be a bit lighter than OS. I may have an oportunity to purchase a new Saito 100 fairly cheap. In terms of reliability would the .90 be any different than than FA 100. It is an inverted mount. Other than weight would it be too large an engine, prop size etc. I didn't really get much use out of the Enya before packing it in for a while. Most of my flying was with 2 strokes at the time. Glad the airplane survived. (hung in a freinds home all these years.)