Weber 40 IDA Float Adjustment Question

[hwy61]

I could use a little clarification from the experts...I want to get it right but I'm confused by the last sentence of this excerpt from Wayne's 101 Projects book...

"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,
Pete

[1QuickS]

I think the measurement is taken with top cover inverted which replicates its being closed.

I never set floats mechanically and call it done. They are never really right, there are many subtle variables that depend upon actual running conditions to set them correctly. Get a float level gauge and follow the procedure here:

Performance Oriented

[hwy61]

That's what I was thinking, thanks...The hanging down bit is less than clear. This is just to get her roughed in and I have the gauge and a set of shims to dial them in under pressure.

[1QuickS]

Use the static setting info to tweek the float to design geometry; when all is nominal the shim package will be 0.070". Be sure to remove the divot on the tongue, peen the back side and support the top of the tongue to push metal divot out. Failure to do so is a good way to suffer erratic float levels and possibly flooding.

[hwy61]

Originally Posted by 1QuickS

Use the static setting info to tweek the float to design geometry; when all is nominal the shim package will be 0.070". Be sure to remove the divot on the tongue, peen the back side and support the top of the tongue to push metal divot out. Failure to do so is a good way to suffer erratic float levels and possibly flooding.

Thanks...will make sure tongue is good and flat!