I just finished servicing the zenith and everything works fine but for it idling very rich. The idle mixture screw doesn't seem to do anything. All the way in or all the way out and nothing changes. I have tried a new screw (though the old looks perfect) and nothing. And the seat also looks fine from what I can see. I know there are a bajillion zenith posts here and I have read a lot of them. This issue seems to have come up before but I haven't found the solve. Any ideas appreciated.
other relevant info. Low mileage 33k barn find SIII. New fuel pump. All gaskets and the o ring in the carb replaced. Choke is open and moves freely. Float is perfect. Carb and is flat and seals. Yet at idle it is rough and black smoke. At speed it is fine so seems limited to an idle adjustment.
other relevant info. Low mileage 33k barn find SIII. New fuel pump. All gaskets and the o ring in the carb replaced. Choke is open and moves freely. Float is perfect. Carb and is flat and seals. Yet at idle it is rough and black smoke. At speed it is fine so seems limited to an idle adjustment.
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