A 46 size 2 stroke will fly it pretty scale. A 52 four stroke may be a little underpowered. When I swap my .46 2 strokes for four strokes I find that a 70 to 80 size 4 stroke works best and has a nice balance of power for the plane. When I tried anything less, the planes always seemed under-powered. BTW, I only use Saito's and OS (both 2 and 4 stroke) so power wise they are pretty good. Also, if you want a good 2 stroke for that plane, try an OS 55AX.

Just my 2 cents.