FAJS 40IDF Carb/Carburetor for Bug/Beetle/Volkswagen/Fiat/Porsche – EMPI/WEBER Model Here in the stock the 44idf carb Auxiliary Venturi 36mm Venturi(choke tube) 10.5mm.main jet size 135 , AIR CORRECTOR JET size 200 ,EMULSION TUBE F11 The 40idf carb Auxiliary Venturi 28mm , Venturi(choke tube) 10.5mm.main jet size 115 , AIR CORRECTOR JET size 200 ,EMULSION TUBE F11 The 48idf Auxiliary Venturi 40mmVenturi(choke tube) 10.5mm. main jet size 155 , AIR CORRECTOR JET size 180 ,EMULSION TUBE F2 
