Via Veloce by Wille R.  www.veloce.se    Internet since November 1995 and still here.

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