The 125 is new and i would avoid it until all the suckers are weeded out and we find out if its worth it. YS has a good rep as a powerful engine but an equal rep as being a real pain of an engine.

Also I am very impressed with my setup and the guy with the Saito 100. We'er also at 5000ft and take a healthy power loss. This combo at a much lower altitude will be much better than here.