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The issues with old gas include varnish and varnish flakes that clog up jets in smaller engine carburetors, so a 1.5L carburetor is going to clog up more easily then a 6 litter engine on a truck would, so a string trimmer is going to be fussy while a tractor might not be, and on something like a 2 stroke out board engine that is sensitive and will burn a piston if you run it lean it's best not to risk a partial clogged carburetor, where an old single cylinder John Deere tractor doesn't even care if there is water in the gasoline.
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