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I've read that a 1/2 oz of marvel mystery oil poured into each cylinder has reportedly worked wonders on long neglected engines.
Certainly worth a shot, no? I'd suggest leaving it to work for 24-48 hours prior to cranking.
Suggest a pro clean on carbs as well, wet testing for any float valve leaks. Do the petcock as well.
Brand new plugs, and new fuel after draining the old prior to start attempts. Fully charge the battery as well.
Check state of air filter as well.
Best o' luck with it.
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