Gregory Bender


Parts diagram for Dellorto VHB carburetors

Detailed technical information regarding Dell’Orto motorcycle carburetors, how to tune, parts diagrams, slide specifications, needle specifications, jet specifications, and atomizer specifications.

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Updated:


Thanks to Matt Cooper from Eurocarb for providing the following information describing the differences between the various VHB carbs.

VHB was the original carburetor for all 20 mm to 30 mm sizes. Then Dellorto changed to VHBZ for 20 mm to 26 mm carburetors and VHBT for 27 mm to 30 mm carburetors. VHBZ and VHBT have a separate needle and seat.

Photo courtesy of Moto Guzzi.

Photo courtesy of Eurocarb.

Table: Parts list for exploded parts diagram

Image Number Part Number Description Sizes/options available
1 7447 Slide 20 mm - 26 mm 30, 40, 50, 60
1 7454 Slide 27 mm - 30 mm 60
2 2343 Needle 20 mm - 26 mm E1 to E42
2 7455 Needle 27 mm - 30 mm V1 to V14
3 8203 Atomizer U 20 mm - 26 mm 260
3 8299 Atomizer V 20 mm - 26 mm 260
3 8358 Atomizer K 20 mm - 26 mm 260, 262 ,264, 266, 268, 270
3 8566 Atomizer D 20 mm - 26 mm 260, 266, 270
3 7456 Atomizer M 27 mm - 30 mm 260, 262, 265, 270
3 7755 Atomizer N 27 mm - 30 mm 260, 265, 270
3 7790 Atomizer P 27 mm - 30 mm 260, 262, 265, 266, 268, 270
3 7972 Atomizer T 27 mm - 30 mm 260, 262, 264, 265, 266, 268, 270
3 7878 Atomizer 29 mm - 30 mm CS/CD 265, 270
4 6413 Main Jet 56 to 330, in steps of 1, 2, 3
5 1486 Idle jet (short) 30 to 198, in steps of 1, 2, 3
6 7746 Choke jet 45, 50, 55, 60, 65, 70, 75, 80, 85, 90
7 7450 Float Assembly .1, .2, .3
8 1476 Rubber cable cap  
9 1104 Cable adjuster  
10 1691 Adjuster locknut  
11 3978 Top cover screw, Hex Head  
11 3318 Top cover screw  
12 5011 Spring washer  
13 7336 Top cover 20 mm - 26 mm  
13 7338 Top cover 27 mm - 30 mm  
14 8210 Top cover gasket 20 mm - 26 mm  
14 8208 Top cover gasket 27 mm - 30 mm  
15 7745 Choke support screw  
16 8295 Choke support  
17 8297 Choke support o-ring  
18 3133 Choke return spring  
19 3238 Choke piston  
20 7449 Mixture screw  
21 7446 Mixture screw spring  
22 7673 Slide stop screw  
23 4670 Slide stop spring  
24 7448 Slide spring 2kg/35 mm
24 7941 Slide spring 1.1kg/35 mm
24 8750 Slide spring 0.8kg/35 mm
25 1407 Needle clip  
26 8128 Clamp nut  
27 8131 Manifold clamp 20 mm - 26 mm  
27 8142 Manifold clamp 27 mm - 30 mm  
28 8127 Clamp bolt  
29 6976 Manifold sleeve 20 mm - 26 mm I/D 28.57 mm
29 6977 Manifold sleeve 20 mm - 26 mm I/D 28.57 mm (25 mm carb.)
29 7569 Manifold sleeve 20 mm - 26 mm I/D 25.4 mm
29 8792 Manifold sleeve 20 mm - 26 mm I/D 30 mm
29 7453 Manifold sleeve 27 mm - 30 mm I/D 35 mm
29 8434 Manifold sleeve 27 mm - 30 mm I/D 37 mm
30 6109 Fuel filter  
31 9250 Fuel banjo Plastic
32 4568 Banjo bolt  
33 4559 Needle valve  
33 9436 Needle valve assembly VHBZ/T  
34 6173 O-ring  
35 7346 Float pivot pin  
36 7451 Float bowl o-ring  
37 7335 Float bowl  
38 6266 Float bowl seal  
39 6267 float bowl nut  
40 1481 Cable adjuster  
41 1692 Adjuster locknut  
42 3698 90 Degree cable elbow  
42 3600 70 Degree cable elbow  
42 9330 40 Degree cable elbow  
42 10854 50 Degree cable elbow  
43 8730 Pull-up choke assembly  
44 9328 Choke locking spring  
45 8294 Lever choke assembly 20 mm - 26 mm  
45 8293 Lever choke assembly 27 mm - 30 mm  
46 8260 Mixture screw washer  
47 8678 Mixture screw o-ring  
48 4650 Stop screw Washer  
49 7540 Stop screw o-ring  
50 5495 Circlip  
51 9327 Choke operating lever  
52 6288 Needle valve seal, VHBZ/T  
53 4224 Trumpet, 20 mm  
54 1439 Trumpet, 30 mm  
55 3100 Trumpet  
56 7878 Atomizer, VHB CS/CD  
57 4052 Banjo bolt seal  
59 6517 Fuel banjo  
60 8752 Fuel banjo, 6 mm  
61 4053 Banjo bolt  
62 7890 Double fuel banjo  
63 7879 Pump body  
64 7831 Pump piston  
65 7185 Pump ball bearing  
66 7832 Holder  
67 7882 Spring Pump assembly for CS/CD
68 7828 Main jet holder  
69 1486 Main jet (See item 5 for sizes)  
70 4057 Float bowl seal  
71 7880 Float bowl nut  
72 52510 Gasket set VHB/T 29 mm - 30 mm C
72 52511 Gasket set VHB Linked
72 52512 Gasket set VHB/Z 20 mm - 26 mm
72 52517 Gasket set VHB/T 27 mm - 30 mm
72 52517 Gasket set VHB/T 27 mm - 30 mm