Gregory Bender


Slide needle specifications for Dellorto PHVA-PHBN motorcycle carburetors (A slides): Series 13680 X 08 A

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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This information was gleaned from Eurocarb. When I originally created this page on , I meticulously recreated the table of values from a very difficult to read original image. Mistakes were definitely present as the original image was of poor quality. Here is a link to the original image in case you would like to scrutinize any particulars.

On I noted that Eurocarb had greatly improved the quality of these specifications. I've updated the specification with accurate information as provided by Eurocarb.

PHVA-PHBN carburetor slide needle.
PHVA-PHBN carburetor slide needle.

Photo courtesy of Eurocarb.

Table: Slide needle series 13680 X 08 A

Type Value X Characteristic expressed in millimeters
ØA ØB C D
A02 02 2 0.6 20 12
A07 07 2 1 18 14
A08 08 2 1 20 12
A10 10 2.02 0.6 18 14
A11 11 2.02 0.6 20 12
A12 12 2 1.79 20 12
A13 13 2 1.79 22 10
A14 14 2.02 1 18 14
A15 15 1.98 1.77 20 12
A18 18 2.04 0.61 21.9 10.07
A19 19 1.98 1.77 20.3 11.7
A20 20 2 1.6 20 12
A21 21 1.99 1.79 18.1 13.8
A23 23 1.98 1 18 14
A24 24 1.99 1 20 12
A25 25 2.02 1.4 20 12
A26 26 2 1.9 20 12
A27 27 1.98 1.8 20 12
A28 28 1.99 1.8 20 12
A29 29 2.02 1.2 20 12
A30 30 1.99 1.40 20 12
A31 31 1.98 1.40 20 12
A33 33 2 1 21 11
A32 32 1.98 1.70 20 12
A34 34 2 - 21 11
A35 35 2 1.60 18 14
A36 36 2.02 1.60 18 14
A37 37 2 1.20 18 14