Miguel, it seems the Saito 2.20 and the YS 1.60 would be way more engine than you need on this plane based solely on experience reported from other pilots. If you want a 4-stroker, I would use a Saito 1.80 and mount the rudder servo near the wing to transfer weight, battery as far forward as possible. Mine is still in the box, but I've studied the experiences of others with this plane (for what it's worth) in order to plan my set-up. Hope this helps, Jeff