Leo, BME doesn't make a 60.. only a 50 and soon to be a 55.. any 50cc decent engine will fly your plane just fine. We have three pitts flying and each has a different engine. One a G-62, one a ZDZ 50 and the last one.. an OS 4 Cylinder 4 cycle.. hows that for variety!!!. They all fly just fine..!!! BobH.