Look at
Homebrew Sea Foam (SeaFoam) Motor Treatment Recipe
He uses Diesel for the light oil.
I hate taking apart carbs. But because I run so many 2 cycle small engines and my schedule often gets interrupted SOMETIMES they get gummed up.
So I sort of "soak them in place".
Example 1 - About 2010 I had three chainsaws that I was running and my back went bad resulting in surgery and recovery that took months, the saws sat and gummed up solid. By the time I got to pull them I thought it was a lost cause. Dosed them with good fresh fuel with a proper dash of Sea Foam. I put them where I'd walk by them and I'd yank them about 5 times almost every day or every other day. After about a week one started and after a month they all ran.
Example 2 -
Last year about August we left Mississippi for a quick trip to Va. That quick trip took until January. I had left a Stihl FS55 and an Echo PPT280 I was planning to use in October. When I got back around to using them at the end April they didn't fire up. So I repeated my "fill er up, pull" try again the next day. At the same time I had a Stihl 660 that I had not fired up for years. But I had run the 660 dry before I put it up because I knew that was going to be set up for a while.. That wouldn't start either. Same process. Took about 3 weeks and they all run now.
If it hadn't been for Covid19 I would have taken them to a dealer to fix.
And I run all of them on alcohol free gas, in Mississippi there's a station about a half mile from me

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