ORIGINAL: Gray Beard
I sure wish people would quit saying YS is a fuel hog, it is no different then any other four stroke and burns 15% just like OS and Saito. Mater of fact my YS 1.10s are better on fuel then my Saito 100s and about the same as my OS .91s. I even run 15% in the 1.40s. I have even tried as low as 5% and the only difference I noticed was the idle was a bit off and needed a tune up.
They are popular at my club in the UK, but their chief proponent has his YS engines serviced regularly every winter because he claims they "go off" due to wear.
The only engine I've ever had serviced was the Laser 90 I bought from an estate sale in 1990 because obviously it had been abused. Maybe I just don't do enough flying.