It flies great with the recommended OS .91 Surpass II 4-stroke and a 14x7 prop. Occasionally i do find myself wishing for a tiny bit more power and my own opinion is that a Saito 100 is the most you'd need for this plane, but there are plenty of guys that have put a bigger motor in there.

If you like 2-strokes then i'd go with a .91 although i flew mine for a while with the OS .75AX and it was terrific, but the plane just screams out for a 4-stroke. It looks and sounds terrific with the 4-stroke on full song.