I have the 110 on a Funtana 90 and its a blast. That said. the 110 is a direct drop in replacement for the 91. Put it in the UCD and try it. You are familiar with the plane and see what happens. It will at a minimum be a good place to break the engine in with low chance of engine damage due to a crash since you are already familiar with the plane. I have not had the pleasure to fly the EF Yak yet, but from all accounts it may be a better plane?

Ed M.