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Yes, that's exactly how it works. There is a wax pack in the connector above the pintle. As the wax is heated it pushes the pintle into the enrichment port closing off the excess fuel needed for cold starts. It also brings the fast idle down with the decrease in fuel. My initial thought was the bystarter wasn't heating, keeping the pintle retracted and allowing excess fuel into the carb causing a rough idle and stall. The pintle is working though so the rough idle and stalling leads me back to a blockage in the carb or something causing the poor performance.
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