Adjustable Part Throttle Feature

New power piston and primary metering rod assembly. Piston has pressed-in pin which protrudes through float bowl and gasket to contact adjustable link in throttle body and metering rods have different taper (identified by "B" stamped after diameter on rod). Adjusting screw is located in recess in front center of throttle body and screw hole is sealed with a welch plug. This adjustment is made at factory and no attempt should be made to change setting or made adjustment in the field.