Invert casting and hold finger against float fulcrum pin retainer to assure fulcrum pin is bottomed in its guide slots. Measure the dimension as shown in specifications from surface of fuel bowl to the top of crown at center of each float (1955-56 at outer ends of float). To adjust bend lip of float.
NOTE: Never allow the needle to be pressed into seat when adjusting
Open. throttle valve slightly and hold choke valve fully closed to allow fast idle cam (in piston housing) to rotate to fast idle position. The dimension between lower edge of throttle valve and bore of casting should be as specified. To adjust, bend connector rod (C).
Place fast idle screw (A) on the index mark (or highest step) of fast idle cam and adjust the screw to the dimension as specified, between lower edge of throttle valve and edge of casting.
With engine running at operating temperature, place, fast idle screw on step of cam as shown in specifications, then adjust fast idle screw to RPM specifications.
Hold throttle valves wide open and close choke valve as far as possible without forcing. The dimension between top edge of choke valve and inner wall of air horn, should be as specified. To adjust (1955 and early 1956 carburetors) bend trip lever arm in housing; (late 1956 and later-see insert) bend unloader arm (B) on throttle lever.
Press Diaphragm stem inward until diaphragm is bottomed on 1964 carburetors; 1965 and later, press diaphragm plunger (not stem) to bottom diaphragm to allow diaphragm stem internal spring to be compressed by extending the stem as choke valve is moved toward the closed position to obtain the proper dimension between top edge of choke valve and wall of air horn. To adjust to specifications, open or close the “U” bend of choke operating link.
NOTE: Optional method of bottoming diaphragm is to apply at least 10? of vacuum from an outside source to diaphragm assembly.