Stupid question: I'm on my second tank at 16:1. Is that too oil-rich?

I'm concerned about the wrist pin bushing. I was planning to never go leaner than 20:1, but it seems like you guys are doing fine at 40:1.
Oh, i'm using Castrol 2-stroke Motorcycle oil. It doesn't say if it's synthetic...

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-Herman

"Do not take life too seriously. You will never get out of it alive." -Elbert Hubbard