Well, I just went out and futzed with it a little bit and installed my new thermospirals and retainer springs on the nice new freely functioning exhaust flaps. I have to say, these DO make a difference at least on my car in this cool humid day here in new england. My car can come off of choke much sooner than before when the flaps were sitting permanently in the non-heated state. Now that the thermospirals hold the flaps in the heated state while cold it seems the mixture has a much nicer time making it's way to the cylinders!

Anyway, I've postponed the rebuild of the choke pull off and the general carb rebuild until it's a bit sunnier out this weekend...

I think there are so many separate little systems on the zeniths that one or two can fail and not really degrade the running of the car all THAT much until eventually, perhaps years later, another thing finally goes wrong and it becomes REALLY noticeable. That causes you to fix the obviously malfunctioning bit thinking "aha! I've found it!", when in reality that was just one of the many fine tuning features that the carb has available and the real source of the problem is perhaps a different system or something even more basic. At any rate, I really like the zeniths, even in their slightly sub-optimal state mine are currently running better than the webers ever did. At their core they are fairly simple once you see past all the little "add-ons" and odd methods of adjusting balance/idle speed/etc.

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1967 230S automatic
Boston, MA