There was a review of the Yellow ARF about 6-8 months ago and the fellow used a Saito 170 radial with excellent results. (Atleast I think it was MAN that had the article...it's not listed in the review section of the website...which is because it was an article/review....).

I'm about to fly the same plane but with a Saito 180 (and TME smoke system). I'll post video in a month or so.

-Juhan