I read here on RCU of someone put who a YS 110 on either an Edge or an Extra 66". I think it was in the "Any good?" thread. They didn't give specifics on balancing other than to say they liked the extra power and "it flew great". I imagine the battery will need to go back in the tail section somewhere for proper CG. I hope no any extra balance weight will be needed (it wasn't mentioned). This is just what I've read so far, I haven't put mine together yet.

Of course, the firewall should be either pinned or reinforced with tri-stock when using bigger motors than the suggested size.