Hello Ken!

I had my first flight with my Great Planes J-3 Cub .20 with an ASP FS30AR (same engine as the Magnum XL-30RFS, same factory, same people) on it last week. The engine has had about 12-15 tanks of fuel through it now, and it is getting better and better. I also own an OS FS-52S. These two engines are the only four stroke engines I have experience with, so I don't have the largest statistic material, but so far the ASP (Magnum) seems to be just as good as the OS. It holds carb settings well, holds a low idle and has plenty power for scale flight with the Cub. It took a little longer than the OS to break in, and it is still getting better every flight.

I like the .20 Cub / ASP FS30AR combo.

-Tore.