mesaflyer, Saito is just covering their butt. They figure if you run 20% oil you wont have a problem. I believe this is also their thinking on the factory low speed needle settings. I just broke in my 6th Saito motor. All have been at least 1-1/2 turns rich on the low end. The YS20/20 blend is 20% synthetic oil and 20% nitro. Many people run it in their Saitos with no problem. I personally run PowerMaster 15% nitro in all of my Saitos but one. I run PM 30% in it. The fuel you have will be fine. Just make sure you break it in really rich and get a tach to tune it. I don't use the YS blend because I use the same fuel jug for several two stroke planes also.

David