Gregory Bender

Setting the float height on Dellorto carburetors

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

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This information was gleaned from Eurocarb.

Whenever the float or float-arm position does not correspond to the proper specified level setting or is not parallel to the float chamber face, bend the float arms carefully to set the correct position.

Table: Dellorto carburetor float height values

CarburetorFloat height, millimeters
PHBG16 +/- 0.5
PHBL24 +/- 0.5
PHBH24 +/- 0.5
PHBE18 +/- 0.5
PHF18 +/- 0.5
PHM18 +/- 0.5
VHB/Z/T24 +/- 0.5
PHSB*11 +/- 0.5
VHSA*11 +/- 0.5
VHSB*11 +/- 0.5
* PHSB/VHSA/VHSB one piece float assembly.

What is the difference between connected floats with floats with independent parts?

Thanks to Charlie Mullendore of Antietam Classic Cycle who posted this information on the Yahoo! Loopframe_Guzzi news group.

My take on it is:

  • Independent floats slide up and down on a steel pins and aren't connected in any way. There are two floats and one common central V or U shaped metal piece that act upon that controls the needle.
  • Connected is two floats attached to a common central V or U shaped metal piece. This is the type VHBs use.
Figure 13: setting the float on carburetors with connected floats.
Figure 13: setting the float on carburetors with connected floats.

Photo courtesy of unknown.

Figure 14: setting the float on carburetors with independent parts.
Figure 14: setting the float on carburetors with independent parts.

Photo courtesy of unknown.