Carb trouble on harley Sportster
Not saying this will be your solution, but certainly worth considering. We had some Onan generators that sat too long at out RV dealership and were basically told carb would need replacing, as they do not have rebuild kits. At $500 a shot we decided to dump some Lucas fuel treatment and fresh gas in it. We basically tripled recommended dosage on bottle, and when engine ran we had enough lucas in there that it smoked like crazy but ran. We would run a little more through it, shut it down, let it sit for a few hours, start again, run a little, shut it down. Then let all that cleaner sit in overnight, and filled it with fresh gas again, and started it up, and after an hour or so of running steady, quit smokin, and ran like a charm. $10 worth of Lucas vs $500 carb. Did same to 3 other generators with same problem, and 2 out of 3 were cured. As it says on their site, too much will not damage the engine, so we didn't worry about that. After they were running good again, we replaced spark plugs and they were good to go, and owners were thrilled. Maybe we got lucky, but for $10-$15, I'd try it.
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