os are great engines just stay away from the LAs, there dogs, no power, turn very small props, sound bad, and quit every flight, thats not from running out of gas its from being a bad engine. i bought a used 46 fx and as long as you get the low end needle and highend needle set right (that takes a while) than it will be a great engine, i have had that engine for four years (i fly that engine at least 6 times a week) and who know how long the guy i bought it from had it.