1972 johson 9 1/2 lean rich screw

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The initial setting is around 1 1/2 turns out from a lightly closed position.
From this setting, once started and warmed, turn the idle needle back in slowly 1/8 turn or so at a time until the engine RPM comes up and runs smoother. Keep turning until the engine spits lean then back up around 1/4 turn. This should get you a good solid ballpark setting. Any tailoring you want to do from there will be in tiny increments until you like the way it runs for you. There is no hard and fast setting all engines run at.
 

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