I looked into that. The front end/cowling is simply not "right" for a four-banger. You could certainly get one on there; but it would look hokey as hell, and you would have serious prop clearance issues.

I have been wanting to build a Kadet MK II for some time. I want to put my 52 Surpass on it, but the same reasons not to apply. The Kadet actually has more "room" up front, but the necessary 12 inch prop would be too long.

A .46 is 'way more engine than you need, unless you make lead sled out of it. The plane was designed for the light .40s of the day (K&B. etc.). My .40 SF is too heavy; while the plane's performance doesn't suffer, it is still slightly nose heavy with the battery back as far as I can get it.

FYI...