Treven is heading where I'm heading. Sure castor's properties sound good, but what is reality?

A lean run means what? high temperatures or lack of oil? Consider the fact the the needle also controls how much oil is going through the engine as does the oil percentage in the fuel. So what does a lean run really do?

Yeah, I've read the MEN page and it says exactly what I mean. It doesn't say that anything other than castor is useless, you just need to know what you have.

Castor work fine but is expensive, it smells nice too. Proper selection of two stroke oils should be fine too. Even regular crankcase oil works. if you want to cook up veggie oils that's fine except you don't really know what you have in properties.