put a regulator on that saito and it will never quite again, You can't believe the difference! Without the regulator my plane sounded like somebody was beating a snare drum. Afer I put the rueulator on, it was dead quiet. Everybody wondered what happened to my engine. The Saito is the lightest engine there is for the power. I'm sure the YS is nice, I just didn't want the extra weight. For my flying, 1/2 pound of extra weight is a lot

John