Weber carburetor data and Dellorto data

First chart shows data for 105 series. GTA versions and and 101/750 , see second chart At the bottom of the page you will find a drawing of the different jets.

Note: The data for Dellorto is the same as for the Weber, 1750 engine except for pump jet, which should be 33 for the 2000 version instead of 40 for the 1750 version.

If you copy the sites, please rmember where you got it, thank you.

105-series data

Part name 1300 105series 40DCOE28 1600
105 series 40DCOE27 1600
105 series 40DCOE4 1600
Giulia Super 40DCOE24 1750 40DCOE32 2000 40DCOE78 *note

Venturi 28 30 30 27 32 32

Aux. venturi 4,5 4,5 4,5 4,5 4,5 4,5

Main jet 112 120 127 110 130 135

Air corr jet 210 180 220 180 200 210

Emulsion tube F-16 F-16 F-16 F-16 F-9 F-34

Idle jet 50F11 50F11 50F11 50F11 50F8 55F17

Starting jet 65F5 65F5 65F5 65F5 65F5 65F5

Needle valve 150 150 150 150 150 150

Acc. pu,p jet 35 35 35 35 35 35

Acc. pump bypass 60 60 50 50 60 60

Note. 40DCOE 72, 73, 76, 77, 80, 81 have different internal circuits. Jettings in these carbs cannot be applied to previous 40DCOE type carburetors.
101 / 750 and GTA series data

Part name 1300 Veloce 40DCOE2 1600 Veloce 40DCOE2 1300 GTA jr 45DCOE18 1600 GTA 45DCOE14

Venturi 29 30 30 30

Aux. venturi 4,5 4,5 3,5 4,5

Main jet 110 115 120 135

Air corr jet 200 180 220 220

Emulsion tube F-16 F-16 F-9 F-16

Idle jet 50F11 55F11 50F8 55F8

Starting jet 60F5 65F5 65F5 65F5

Needle valve 150 150 150 150

Acc. pu,p jet 35 35 35 35

Acc. pump bypass 50 70 50 50

Idle jet code

Air jet
Diameter in mm F code

0,70 F6

0,90 F12

1,00 F9

1,20 F8-F11-F14

1,30 F13

1,40 F2-F4

1,60 F5

1,70 F7

2,00 F1

2,30 F3

Part code #

Venturi

Auxiliary venturi

Main jet

Air correction jet

Emulsion tube

Idle jet

Needle valve

Accelerator pump jet

Idle mixture adjusting screw

Throttle valve

If you have any comme