From what I understand most oil is repelled by heat.

The exhaust is the hottest part of the cylinder, so it's the least lubricated.

That's why it's important to use the best oil and at the best ratio, to me that means 32 to 1.
50 to 1 was created to handle smog, not for engines to run longer.

The they put Carbs. on that can't be adjusted correctly so that makes them run even leaner.

It's a wonder chainsaws last as well as they do.

And yes, especially with piston damage around the intake makes me think no oil in the gas.