Yeah. The info here doesn' add up. The proper setting is probably going to be a little less than a full turn to begin with. So as Andy said, it would have been bottomed out.
The screen was brown and fuzzy. Not like carbon. Chinese oil?
I didn't try turning the H needle in so I can't say where it was. It was so lean, even with the EPA cap topped out, that it would stall when I opened the throttle. It had to warm up a minute or two before it would even rev. I could recant and say 3/4 of a turn too lean. Either way, it was way too lean.
As far as operator error, the saw had a new bar and chain when I picked it up. The dealer said the original one was burned so.....
The EPA caps weren't dug up. I still say no one touched it.
What I do know is the piston was wasted and the dealer showed me a collection of pistons just like it. Before you bash this guy, he told me that he wasn't allowed to mess with EPA caps on customers saws.