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So, it sounds like small, carbureted motors generally tend to not do as well as larger FI motors on old gas.
How old is too old? It depends. If it runs bad it's too old.
My experience is that winter fuel goes bad faster than summer fuel. E10 goes bad faster than straight gas. Mixing some new fuel with old/bad fuel can get the batch to a useable state, better to use old fuel than use it as a grease solvent, weed killer or fire starter.
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