RE: The best way to run-in an engine
Tom,
I've had a few of the OS46AX engines and always did exactly what the manual says and all are still running to this day. The first one was sold to another club member and has well over 800 flights on it and still fires right up and makes great power. It's whole life has been using Byrons 15/20 fuel. In fact all my OS engines get that fuel. The other as far as I know are also still running