Have you had any experience with that .90? It seems alright, nice low rpm, valve covers look closer, not as nice as the os, but I think that is too big and it is really heavy, not to mention more expensive. So one horsepower will do a decent job of powering this plane? And do you know who sells them? I'll check at the local place, but they aren't incredibly big, so I don't know what they will have for multi-cylinder stuff.

Also, is that engine mount on the .90 any good? It looks kind of flimsy compared to other mounts.