RustyFarmall's advice is right on. However you can make a fairly close adjustment to the load screw like this:
With the engine fully warmed up and running at SLOW idle, quickly pull the throttle wide open. If the engine stumbles or stalls, open the load screw 1/2 turn and repeat. Continue until the engine accelerates without any stumble.
You may see a hint of black in the exhaust when you as you snap open the throttle - this is OK. However if there is any black in the exhaust AFTER the engine reaches governed RPM, the load screw is set too rich - turn it slowly back in just until the black disappears.
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