Edit, now that I think about it when I pulled the carburetors off the second time in one of the bowls I noticed some white material that I've never seen before. Now that I think about it after I took the petcock off the bike and noticed how oxidized the petcock is it's seems likely that maybe some oxidation made it's way down past the fuel filter and into the carburetors. And it could have easily clogged one of the passageways causing the bike not to idle.
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