Carburetor Throttle Valve Shaft Wear

[dennisv]

How much play is too much on a carburetor throttle valve shaft? How is it measured?

We have a set of Zenith 40 TIN and I'd like to evaluate if they are good candidates for rebuild. I've read that the key factor is wear to the throttle valve shaft. I see in a Weber 40 service manual some instructions for removing and replacing shafts that have suffered excessive wear, but I don't see any definition of "excessive".

Thanks.

[Henry Schmidt]

Generally [not always] the only bushing that wear are on the ends with the level/link rods. If you can feel movement it is normally a sign that the cylinders won't balance.
We can refresh them if you decide to go that way. We may even have a restored set on the shelf ready to go.
These are a set of Webers we restored

[Zuffenwerker]

If you can hear them click at idle they are too worn. You will also have trouble balancing.

Henry do you guys sell those specific fuel line ferrules? I like the look and would be interested in purchasing.

Daniel