Carb Question. What is this port?

[john_berry]

Can anyone identify what this port is on the bottom of carb 3. I'm in the middle of a carb rebuild and a desmog. I don't remember what was connected to it. It's a California Valk if that makes a difference.

There is a Red arrow pointing to the port in the picture.

https://www.dropbox.com/s/6qeohg6r2ux3vhk/IMG_8144.jpg?dl=0

[WintrSol]

That appears to be the port for the No.11 vacuum tube, which goes to the EVAP purge control valve. It's a California thing, I think.

[john_berry]

Thank you. I think I will just plug it since I just removed all of that.

[SCain]

Yup, Cali Emission stuff, just plug it.

[Glaserbeam]

I have a California bike.  That's where the vacuum hose from the fuel valve goes.  The smog hoses don't attach to the carbs, they attach to the intake manifolds on #3 and #4, close to the cylinder heads.

Routing all those hoses ... makes installing the carbs & airbox like a jigsaw puzzle.