ORIGINAL: Gray Beard
ORIGINAL: Vacaman
for 3d YS are the best. Better throttle response and power than any other 4 or 2 cycle, except for a piped 2stroke engine. The only problem is that they drink a lot of expensive fuel. The .63 that I have runs like a champ.
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.
Is quite simple, to produce more power more fuel is needed. That´s a fact. And yes, maybe they run ok on 15% but they run a lot better on 20% and 30% becouse they where designed that way. Don´t get me wrong, I love YS engines (I have 3 of them), and in my experience, the higher cost of 20 and 30% fuel more than worth for the preformance you get.
Making comparisions is very subjective. I have the 63. on a profile, and it uses more fuel than 50sx that I had a few years ago in another profile. But the power and torque isn´t the same. I also switched, from my venus II, a 110(non s) for a piped 120ax, and the 120ax use less fuel becouse it can swing a bigger and faster prop.