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Looks like the underlying issue is that a couple of the rollers inside the rod-crank bearing are busted, so that they usually roll, but sometimes get jammed up. Time for a new crankshaft. Is it common on these farmertec saws for that bearing to fail?

I'm looking for some advice on what to do next. Backstory: I have a Farmertec 660 that I built several years ago, ran great, used it for milling, then overheated it (I think?) while milling some Black Locust logs. Piston seemed stuck, couldn't pull the starter cord. I got busy with other...