The Decathlon is a very nice flying plane. The 160 will probably be too much for this airframe. I started with a Saito 150 and had to redo the forewall. I then put an OS 91 FX on the plane and it flew great. The third engine was a Saito 100 that was the best of the three. It fit the cowl well and powered the plane for all the scale and some what extreme maneuvers.