Gregory Bender


Slide needle specifications for Dellorto PHBG motorcycle carburetors (W slides): Series 9595 X 08 W

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.

PHBG carburetor slide needle.
PHBG carburetor slide needle.

Photo courtesy of Eurocarb.

Table: Slide needle series 9595 X 08 W

Type Value X Characteristic expressed in millimeters
ØA ØB C
W1 1 2.46 0.60 24
W2 2 2.46 0.60 22
W3 3 2.48 1.40 20
W4 4 2.48 1.40 18
W5 5 2.46 1.40 18
W6 6 2.50 1.00 24
W7 7 2.50 1.40 18
W8 8 2.50 1.40 16
W9 9 2.50 1.40 20
W10 10 2.50 1.80 16
W11 11 2.50 1.80 18
W12 12 2.50 1.80 20
W13 13 2.50 0.60 22
W14 14 2.50 0.60 24
W15 15 2.50 0.60 26
W16* 16 2.50 1.00 22
W17 17 2.50 1.00 26
W18 18 2.48 0.60 24
W19 19 2.50 1.80 20
W20* 20 2.50 1.60 24
W21 21 2.50 1.60 24
W22* 22 2.50 0.60 26
W23*~ 23 2.50 0.60 26
W24 24 2.50 1.80 24
W25 25 2.50 1.80 22
W26 26 2.50 0.98 24

* Constructed of anodized aluminum

~ Differs from W15 in length; W22 has a length of 42.6