Thanks for all your guys information. Just to let you know I did go with the O.S. FS-91 II Surpass. I guess because I have been hearing they are good engines and I already like the O.S. 2 strokes, so why not stay with O.S. for know anyway. I will let you all know how much, or maybe not, I like it once I get the chance to give it a try. For some reason I am thimking I will be selling some of my two strokes and replacing them with four strokes this summer. Or if I think about it why not just keep the two strokes in the planes I have now and just buy new planes to go with the other four strokes if I do get more, well that sounds better anyway. Anyway thanks guys.