I kind of had an idea that YS had a pump system but was not sure. As I stated above they require more attention then the OS although they are more powerful then the OS I prefer less headache. I also believe the OS 120 will give the Ryan plenty of power with some to spare.

I'm not knocking the YS its just that I would rather fly then tinker with the engine half the day.

I'm not up as to what engine produces more power then the other but if I am not mistaken my Saito 100 is equivalent to the YS 91 in performance, so if that is the case then what your saying is the Saito 100 produces more power then the OS 120? Myself that sounds irrational and hard to believe. *shrugs*

Randy