To adjust the cable- Unscrew the cable housing adjuster lock nut at the top of the carb almost all the way, turn the cable housing adjuster in until there is a little freeplay in between the cable housing and the cable housing adjuster.

Gently unscrew the cable housing adjuster until it makes contact with the cable housing and then screw down and lock the cable housing adjuster lock nut.

Adjust idle with idle adjustment screw.

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If it ain't broke, and you mess with it long enough, it will be.