The minimum engine requirements for the Venus II are .61 2-stroke or .91 four stroke. The 1.20 AX and the O.S. FS-120S-E Surpass would both provide more than enough power to fly the Venus II with authority. The 1.20 AX would have more peak power and weighs a few ounces less than the FS-120S-E Surpass however, and is generally regarded as offering more value as it costs about $100 less.

The Saito 1.25 costs $40 less than the FS-120S-E Surpass, and weighs a full half a pound less. It would also be an excellent choice for the Venus II, but care would have to be taken to make sure the airplane didn't come out tail heavy. The O.S. 1.20 AX weighs about five ounces more than the Saito 1.25, and most pilots say the Venus II balances nicely with the 1.20 AX. Servo placement should be useful for adjusting the CG without adding nose weight.