Is your carb leaking externally? I would have to guess that your needle/seat are leaking into the cylinder and down into the oil. See alot of it expecialy if the overflow is blocked with dirt and not letting it get out.
Maybe my overflow is blocked. As I was taking the bike apart a rubber hose fell out that had appeared to have melted off, as it looked ripped and seared shut. And since Im awaitng my manual to arrive I have no idea where it goes.
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