Jeep 1987 Wrangler Workshop Manual page 470

ENGINES
FUEL SYSTEM - BBD CARBURETOR
Turn the mixture screw(s) richer (counter-
clockwise) until the highest RPM indication is
obtained. Do not turn the screw(s) any further
than the point at which the highest RPM is first
obtained. This is referred to as LEAN B E S T
IDLE.
NOTE: The engine speed will increase above
the curb idle s p e e d by an amount that
corresponds to approximately the IDLE DROP
specification to be obtained in the next step.
As a final adjustment, turn the mixture screws
clockwise (leaner) to obtain the specified drop in
engine idle RPM.
Turn both the idle mixture screws in small, equal
amounts until the specified IDLE D R O P is
achieved. Refer to the Mixture Adjustment chart.
NOTE: If the final engine RPM differs more than
± 3 0 RPM from the original curb idle RPM,
adjust the curb idle speed to the specified RPM
and repeat the last two steps listed above.
NOTE: It is necessary to remove the carburetor
to gain access for installing the dowel pins.
Refer to Carburetor Removal for the procedure.
Install the dowel pins after completing the idle
mixture adjustment. Use care to prevent dis-
turbing the mixture adjustment screw positions.
B-236