Rate1, I just returned your PM.. now you have me interested in watching this thread to see how it all turns out!

I ended up taking out almost all the right-thrust on my 60-size GP Extra by shimming the engine mount. It took years before I realized that all the right-thrust was not really needed and the plane actually flies much better without it!

I think that the YS 140 Sport is an excellent choice for this airplane. Plenty of power to spare and a bit more user-friendly than a YS 160 which would be insane power for this airplane anyway.

Most of my YS engines are mounted inverted and if anything they seem to run better this way than mounted on their side.

Walt