I don't have internet access at work so I'm just assuming that you are
talking about the bypass/deceleration valve on the ZS carb.  I just got one
of those from Spit Bits for around $10 for my '79 Spit.  Let me know if you
need me to give you the part number and I can look it up at home.  It was
easy to install and definitely needed since the old one was stiff and
inflexible.
Bob
'79 Spit 
> ------------------------------
> 
> Date: Mon, 6 Dec 1999 08:16:37 -0500
> From: drcarey@us.ibm.com
> Subject: Looking for a 79 spit part...bypass valve see photo
> 
> http://pages.prodigy.net/appleorchard/part.jpg
> 
> 
> Daniel R. Carey
> 
 
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