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Yup, I used to run Optimol 25 years ago when it was still new. I never ran it at 100-1 but it's a very good mix oil and works perfectly at normal mix ratios. My point was that ethanol fuel and non ethanol fuel burn at different rates. If you're going to run ethanol fuel, then tune your saws...

Earlier this week all my saws started running lean and hot. I haven't done anything different, but the gas pumps at Sam's (where I've been fueling up for the last 2 months) now have the '10% ethanol' stickers on them. After figuring it out, I grabbed a spare 5 gallon can and went and got good...

Is that a nick on the edge of the exhaust port?

It's probably junk, I'll take it off your hands for ya, Willie. I'll even pay shipping! :P

Sounds like it got hot and seized up. I'd pull the muffler and inspect the piston.