Gregory Bender


Slide needle specifications for Dellorto PHBE...P-VHSA motorcycle carburetors (U slides): Series 9713 X 08 U

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.

PHBE...P-VHSA carburetor slide needle. Note the term cilindrico which translates to cylindrical.
PHBE...P-VHSA carburetor slide needle. Note the term cilindrico which translates to cylindrical.

Photo courtesy of Eurocarb.

Table: Slide needle series 9713 X 08 U

Type Value X Characteristic expressed in millimeters
ØA ØB C ØD E
U1 1 2.46 1.40 40 - -
U2 2 2.50 1.80 40 - -
U3 3 2.50 1.40 34 - -
U4 4 2.50 1.40 38 - -
U5 5 2.50 1.40 40 - -
U6 6 2.50 1.40 42 - -
U7 7 2.50 1.80 38 - -
U8 8 2.50 1.80\ 42 - -
U9 9 2.48 1.00 28 2.16 18
U10 10 2.50 1.00 30 2.06 18
U11 11 2.50 1.00 28 2.11 16
U12 12 2.50 1.40 32 - -
U13 13 2.45 1.20 28 - -
U14 14 2.48 0.60 28 2.23 18
U15 15 2.50 1.20 32 - -
U16 16 2.50 1.80 32 - -
U17 17 2.50 0.60 36 - -
U18 18 2.48 1.00 34 - -
U19 19 2.44 1.00 32.6 - -
U20 20 2.44 1.00 34.5 - -
U21 21 2.44 1.00 36 - -
U22 22 2.50 1.00 36.5 - -
U23 23 2.46 1.00 36.5 - -
U24 24 2.46 1.00 34 - -
U25 25 2.48 1.00 36.5 - -