Gregory Bender


Slide needle specifications for Dellorto PHBL motorcycle carburetors (D slides): Series 2265 X 08 D

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.

PHBL carburetor slide needle.
PHBL carburetor slide needle.

Photo courtesy of Eurocarb.

Table: Slide needle series 2265 X 08 D

Type Value X Characteristic expressed in millimeters
ØA ØB C ØD E
D1 1 2.45 1.50 15.4 - -
D3 3 2.42 1.50 14 - -
D21 21 2.50 1.80 20.2 - -
D22 22 2.50 1.40 18 - -
D23 23 2.46 1.00 22 - -
D24 24 2.50 0.60 20 - -
D25 25 2.50 1.40 16 - -
D26 26 2.50 1.40 20 - -
D27 27 2.50 1.80 16 - -
D28 28 2.50 1.80 18 - -
D29 29 2.50 1.80 20 - -
D30 30 2.50 0.60 18 - -
D31 31 2.50 0.60 22 - -
D32 32 2.50 1.00 18 - -
D33 33 2.50 1.00 20 - -
D34 34 2.50 1.00 22 - -
D35 35 2.46 1.40 18 - -
D36 36 2.50 1.40 22 - -
D39 39 2.50 0.95 25 - -
D38 38 2.50 1.00 26 - -
D37 37 2.50 1.40 24 - -
D40 40 2.48 1.00 24 - -
D41 41 2.52 1.00 24.5 - -
D42 42 2.46 0.60 24 2.295 18
D43 43 2.50 0.60 26 2.227 18
D44 44 2.48 1.60 24 - -
D45* 45 2.50 0.60 26 2.227 18
D46 46 2.50 1.00 24 - -
D47 47 2.52 1.40 26 - -
D48 48 2.50 0.80 28 - -
D49 49 2.50 1.40 26 - -
* Constructed of anodized aluminum