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Old Oct 25, 2006, 11:22 AM
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And You're Not
Timbuktu, Mali (Happy?)
Joined Oct 2002
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You don't want to run conventional 4 stroke fuel in a YS at all, really. It has a lower oil content since some of the unburned blow by oil goes back into the crankcase to provide lubrication (this is why there is a vent on a normal 4 stroke spitting out fuel/oil). The YS is like a 2 stroke, all of the lubrication the low end gets is from the oil in the unburned fuel. You see quite a few fuels labled " YS 20/20", this is 20% nitro, 20% oil. Helicopter fuel also generally has a higher than normal oil content so it is OK to run in a YS. As long as the fuel has 20% oil, you'll be fine.
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