When running, there are two adjustments. A high speed power screw, and an idlew screw. The high speed is set (from where it is) by opening the throttle wide open, then screwing the adjuster screw front bottom of carb, inward until the RPM dops a little, and it runs lean. Then turn outward until it picks up max RPM and is smooth. Then idle it down, and open it again. if it stumbles and bogs, it needs a bit richer mix. Open the high speed in 1/4 turn increments till it opens W/O stumbling. This is a starting place for High Speed.
Now Idle it down and turn the idle richness screw (up near the throttle, but not the throttle stop screw) It is richer in leaner out. sSo start by turning it out (again till RPM drop and roughness begins. Turn it in until best idle is found with no black smoke. Lean it (turn out) until it just is noticably slower, and then out 1/4 turn.
Now do the High speed setting as described abofe one more time (they affect each other, and must be done to a ballance.
If the idle speed is too high, adjust it down and then redo the idle and high speed again.
When pulling a real load, the high speed screw may need to be turned out (maybe 1/2 to one turn for good power and to avoid lean condition. Then screwed back that amount inward when not being used hard. Best of luck, JimN
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