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As the spring fatigues, the air valve will open too soon, creating an instantaneous lean condition, and a bog. Measure from toe B to air horn. Metering rods for the WCFB have been out of production for several years now. This eliminates any bog or hesitation when acceleration. Take the top off and put the pump in the well all the way to the bottom. You can also check the adjustment by measuring (F) which should be 18/64. (note) The metering rods will fit into the jets loosely. To correct, remove carburetor and turn it upside down. Download was not the correct rebuild instructions for my WCFB carburetor, and the correct version was not available. Make sure these are clear if you have percolation problems. Carburetors equipped with an adjustable bowl vent require adjustment. Seat the discharge check by tapping lightly in the hole to form a good seal. When the piston is frozen you may have to drill a small hole in the bottom of the float bowl, just under the piston and hammer it out. On the WCFB the check ball is usually at the bottom of the pump well. Carter WCFB 4 Barrel Carburetor Float System. If it is, tap gently with a hammer and the same brass drift punch to seat it, or replace the check weight. Be sure these ports are clear. PDF Carter Carb Identification Chart - annualreport.psg.fr At idle you are at maximum vacuum which makes the metering rods drop down into the main jets. You cannot go wrong with Mikes carburetor in any way. building a wcfb 2x4 setup | Hot Rod Forum How Do You Look up Carter Carburetor ID Numbers Online? - Reference.com From my experience it is the most complete and comprehensive source for all things carburetor, encompassing a massive spectrum of makes models and applications. Founded by William Carter in 1909, the Carter Carburetor Company produced units such as the AVS, AFB and 385-CFM WCFB for dozens of years. Can't find the answer you're looking for. Because the float is maintained in a level position, needle valve bounce is minimized and excess fuel entry into the bowl is prevented.