Weber and Dellorto carburetor 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 #

1. Venturi
2. Auxiliary venturi
3. Main jet
4. Air correction jet
5. Emulsion tube
6. Idle jet
7. Needle valve
8. Accelerator pump jet
9. Idle mixture adjusting screw
10. Throttle valve