I think if someone chose to go with a four cycle, the Saito 170 R3 makes a better choice than a 1.20 single.
thats interesting you brought that up - im debating on getting the gp stearman, i would love to put this engine in it, i live up at 8000' msl, do you think that would be to much?
also, how easy it to do smoke with the saito 170 r3?
thanks