Yes, we race 40-60 size war birds with YS-110 engines. The Zero does need little more weight to the front to balance well even with a YS-110. We now just modify the servo tray and move all the servos and battery as forward as possible. This way no further weight is needed. Here is a picture of 5 of such zeros at our field. Tail number 1163 is mine with "Rain Deer Jack" as the Pilot. Rest of the war birds except the Hanger 9 Mustang (which has YS-140) all have YS-110s in them.