I am one who likes GMS engines. I have a .47 and a .76 and they both produce a TON of power. I had a few deadsticks with the .47 but I fixed that by buying high temp silicon and removing the carb and backplate, putting a bead of silicon around the rim and reinserting them. It now runs perfectly and it has even more power than before. The .76 started the first try out of the box and runs flawlessly. Go ahead and get the 1.20.
Karter