RE: Do you suggest the OS FL-70 4str.?
I'm flying one in a Great Planes Fokker DR-1 and it has been excellent. Starts easily, runs smooth, plenty of power and idles reliably. I haven't found any reason not to like this engine and wouldn't hesitate to buy another. I have many, many flights on this engine without a single problem. Of course this is just my experience with only one engine. Perhaps Bill has owned more of these than I and can speak with more authority on the subject.