Try connecting a small fuel tank to your crankcase vent. I have found that about half of the total oil comes out of it, most of the alcohol is gone, as the oil is very thick. A two stroke's rod has to be lubed with oil that is still dilluted with a lot of alcohol. A YS also has to deal with this. A standard four stroke will live a normal life on 10% oil content. All the original four stroke fuel had low oil content because the engines ran more consistantly on it. As you lower the oil content in a two stroke the rod will tend to fail before the piston sticks, depending on the piston-liner metalurgy. If YS engines never came on the market there still might be low oil four stroke fuel.