The YS 140 sounds like great power for her. A guy in our club had this setup. I regrettably say, had. But it needs to be on a conventional mount and not the stock wooden one. They just don't hold up. I tried them and they will shake apart no matter what you do. I'm very serious about the wing dowel also. I was doing outside loops with mine one day and it just wasn't tracking right. I set up for a landing and on taxing over i noticed that THE BOTTOM WING WAS HANGING FROM THE END STRUTS LIKE A PARASOL! I had replaced the original end struts with ones i had made with 2 layers of aircraft ply and i think that saved my plane. I came to find that the front dowel was only 3/8 in long! It had come out and then the back bolts snapped off! Now that also says something about the strength of her wings also. Cermark has done a lot right with this plane also.