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IIRC, the throttle shaft has an o-ring that can be replaced. You have to take the whole thing apart, including probably destroying the throttle plate screws and replacing them, but it can be done. just get new screws and an O-ring from the local hardware store. Repair is probably a $5 job but it will take a couple hours if you aren't experienced.

An impact screwdriver works great on throttle plate screws. One of the ones you hit with a hammer, not a powered one.

This old how-to might help you:


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