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The way it appears to be laid out, it has sealed crank minor amount of oil getting to some top end. The benefit of a 2 cycle IE light weight 2x the power cycles. Guessed down side slightly more nox and co than conventional 4 stroke at least when new as valve seals guides seals all weep a tiny amount. I would suspect less than a broke in 4 stroke.
ps yes I know I keep saying 2cycle and I do know the difference using most common slag used.
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