911 Carburetor Float question

[hwy61]

It's last sentence is of this section I am confused about...

"With the float tab exactly 18mm from the carburetor upper face, the height of the float should be between 12.5mm and 13mm from the upper face. Do not measure the height from the weld seam of the float, instead use the top surface of the float. If this measurement is incorrect, then bend the float tab slightly until you obtain the required measurements. Additionally, check the height of the needle valve. When installed with its sealing washer, the needle valve should hang down exactly 18mm from the top of the carburetor housing."

Shouldn't the tab close the float needle when it's 18mm below the top of the throttle body? That would make the "hanging down" measurement longer than 18mm, no? Or am I just confused? Thanks!

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[Casey at Pelican Parts]

I am not sure I understand your question, but if this helps...The float should have the needle valve closed at 18mm. And as the float drops I believe it should open the needle valve allowing more fuel to enter the float bowl.

- Casey