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Join Date: Mar 2011
No expert here, but the stock petcock is vacuum regulated, and the carbs are gravity fed fuel as long as there is vacuum on the petcock.
Perhaps if your new petcock is gravity fed, but not regulated ion any way, therefore always open, perhaps the fact that the bike acts like it is flooded is because it actually is flooded.
Just a thought. Perhaps someone else with more experience/knowledge will chime in soon.