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Home >> Dodge and Ram >> 1972 >> Colt Not Available, Not Available Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Colt Engine Modification >> Adjustment >> Carburetor >> Idle Speed & Mixture

Idle Speed & Mixture

Operate engine at idle speed for more than one minute with coolant temperature between 170°F and 190°F. Adjust mixture control screw and throttle stop screw to obtain an idle speed of 800-850 RPM and CO level of 3-5%. Increase engine speed to 2500 RPM two or three times and recheck adjustment.

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