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James Dean | all galleries >> Galleries >> Helpful Tips JDJetting Carburetor Parts -Picture Gallery > Air Fuel Screw Mixture Lean to Rich
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James Dean JDJetting

Air Fuel Screw Mixture Lean to Rich

Red: 1/2 turn out from seated
Orange: 1 turn
Yellow: 1 1/2 turns
Green: 2 turns
Blue: 2 1/2 turns
Black: 3 turns

Recommendation: Set the fuel screw by turning inwards until the idle speed lowers by about 200-300rpm, then turn outwards 1 to 1 1/4 turns.
Note: The idle speed will fluctuate more and be unsteady as the idle mixture becomes lean and near 15:1 Air/Fuel ratio.

other sizes: small medium large auto