The Mgnum 1.08 weighs quite a bit more than the 91FX. If you're looking at the TowerHobbies specs for the 1.08, it's wrong. I have a Magnum 1.08 and it weighs a little over 30 Oz. with muffler - about the same as my Magnum 1.20 4stroke. It also turns a 16x6 or 15x8 about the same RPM as the 1.20 4stroke. Don't let me discourage you from buying the 1.08, as it is one nice 2stroke engine. I just don't want you to be surprised by the weight when you get it. If you use a Pitts muffler, my guess is that it'll weigh around 28 Oz. total.

This Edge 540 is looking better everytime I come into this thread. I might just have to get it and put the 1.08 on it.