That's got to be the dumbest advice ever put in a manual. The carb feeds 4 cylinders, not 1. And no one is going to run alongside a tractor while under a load and adjust the carburetor. Not gonna happen. That only works with a dyno which most people don't have.
There is two ways to set up your carburetor with your ears. Get the engine to operating temperature first.
For power - adjust the load needle until it runs smooth. Ease the needle out until it starts stumbling. Ease it back in until it just smothes out and stop. This is considered a rich working setting.
For a lean puttering around - adjust the load needle until it smoothes out. Ease the needle in until it just starts to stumble. Ease it back out until it just smoothes out and stop.
Yes you will probably need to readjust the idle screw afterwards. Listen carefully and turn the screws slowly and you will be fine.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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