I imagine you may continue having this problem. The seat is not replaceable in the Walbro, as you've probably discovered, and if it's worn, a new needle won't fix the problem for very long. The best solution in my opinion is to remove that POS Walbro and put on a rebuilt adjustable carb from a KT-17. That carb is completely rebuildable, and you'll be able to adjust it so that the engine will idle nicely. Very few of the twins with the Walbro will idle right.
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