Randy,
I have a Saito 72 on my Super Stearman. Its my first 4 stroke, and I hate 2 strokes now. I won't fly my Super Sportster anymore because I tired of cleaning the oil off the tail and side of it after every flight. It has a OS 46 FX on it. I fly the Stearman 5 or 6 times for 10 or so minutes each flight every nite. When Im done, 1 paper towell and about 20 seconds cleans it up like I never flew it at all. And I might add that that the Saito 72 uses less fuel than the OS 46 FX. Both my low and high speed are one and a half turns out. The only oil on the plane which is very little, is on the bottom from the crankcase breather hose which I have poking straight down thru a gromet out of the cowling.
Dennis (Red Bluff)

Real airplanes have 2 wings and round motors...........