I have a set of Zenith carbs in storage. I will see if the pin in my valve moves correctly. That valve is also used on the Solex twin carb system.

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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
The Universe is Abundant ~ Life is GOOD!http://www.classiccarclock.com