Funny this thread came back to life. I suspect the youngster that started it has gone on to other things. I recomended the GMS line to him to address "inexpensive." When he started talking 4-strokes, well...

Anyhow, about 6 months ago I too bought a Seagull (on sale, as a home for my .72 Saito, also on sale.) Unlimited vertical wasn't even on my mind when I bought it but after reading various posts regarding performance I got more and more excited about the possibilities additional power would me. Being sort of stuck with my engine choice the project just ended up on the back shelf gathering dust. I'm still stuck trying to decide whether to live with the .72 and enjoy the Seagull as a general sport flyer or take my own advice and get a GMS.