how about the tank, maybe it has junk in it or a film coating that is getting into the carb...try cleaning the tank out. Take out the petcock so it doesn't get damaged. It may be clogged anyway. To get residue out you can use clean nuts, rocks, etc. Put them in with soapy water, roll it around by hand and let it sit a few. Do it again. Drain, dry out and add NEW fuel.
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