lrglnman and propnut1 , the O.S. 120AX weighs 22.82 oz alone. The Muffler w/90* adaptor weighs 7 oz and the muffler w/extension weighs 7.9 oz. That is close to 31 oz either direction. The price is $264.99 w/ muffler and has 3.1 hp@9k.
The ST2300 is 1.40 cubic inch weighs 38 oz (My BAD..I thought it was 31 oz!!),has 1/2 hp more and is half price. Just seemed like a good deal. At 38oz ,it would be lighter than a gasser and cheap enough (unless it is a POS) for me to afford. Just seemed like a good idea.
I know sometime back that the ST2300 were known for having real bad carb problems..Just wonder if they were ever fixed.
I have a 125 Saito (NIB) and a slightly used YS 110 and I hear they are not really enough to do Down on the Deck stuff with this bird. Am looking for a fairly light 3D style plane, but would love to be able to have the Seagull Ulti. Thanks, TJ