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- Dabs of Rosin.
Newer equipment and carb kits should all be able to handle the ethanol, but older rubber gaskets literally swell-up and dissolve.I use gas with no ethanol in my small engines. There are only a couple of gas stations that sell it here, 91 octane. I found out ethanol destroys rubber parts after I had to change the fuel line on the chainsaw a second time.