Bob,
I don't have one or have flown one. A local at my field yesterday has/had one. He had recovered his in blue and white, I think the scheme of some General von Raben pilot, looked really good. He told me why he recovered it. Apparantly the bottom wing does not have any hard wood spar at all, so when landing/taxying, if a bottom wingtip catches any grass or other protrusions, it is liable to break from the twist. This guy had a Saito91 in his, and needed some 1.5 lbs of lead in the nose, yes, you read it right/I wrote it right, 1.5 lbs, so might as well stuff a YS91/1.20.Saito1.50 in the nose of it. It seemed to fly very well, I was very surprised that despite his limited flying experience, he almost flew it like a funfly, slow, close and low.
If you have the money or enginie, I would think the Saito170R3 would be perfect for this bird.
DKjens