RE: Engine size on Super Tiger 60
I flew the Tiger 60 as my second plane for about two years. I started out with an OS 61 FX. It was a great engine with lots of power. I bought it at an estate sale and it really needed bearings, so after a few months of flying it that way, I swapped it out with a Super Tigre 75 and a tuned pipe. WOW was all I could say for that combination.
My instructor said that I could use that plane for entry level Pattern competition, so I started practicing the Sportsman level routines and really learned how to fly really well with that plane. It was instrumental in my really learning to land the plane correctly, a technique I use all the time with all of my planes.
Either way, your engine choices are fine.. but I tend to shy away from the LA series engines for all the reasons mentioned above. And, I had great luck with the OS 61 FX as well as the Super Tigre 75.
By the way, as far as I know, that plane still flys today, even after all the abuse I gave it as a second plane.
CGr.