[Badpuppy]

I think the piston condition is a symptom, not a cause. Check the exhaust system for blockage.

I'd hone the cylinders in place, protect the crank races from the dust. I think the hone would remove the aluminum rather easily. If not, then maybe machining would be required.

If you're a cheapskate like me, I'd try to salvage the pistons with a ring groove cutter/cleaner, maybe flat file on the sides. But new rings are a must.