I agree the 120 4-cycle is the engine for this airplane. Have a OS-120 in mine and
it flies like a Ryan should. I installed an aftermarket landing gear and have had no
problems with the wheel pants. For the first 25 flights I flew withhout an on board glow.
Never had a dead stick but its idle was on the rich side. I since have installed one and
the engine runs much better. Also not having to use a glow driver is nice, just set the
throttle to idle and hit it with the starter. Like one of the others said the Ryan draws a
lot of attention where ever you fly it. Saw one with a Zenoah 23 in it, and it flew like a
warbird, and the cowl was mostly cut away. What a shame!