Solex Z1 32/34 Automatic Choke adjustment

[Jugostran]

Hey all!
It's been too long, how's everyone doing? I'm currently working on doing a major engine out engine bay revival on my BX, including swapping all the gaskets and seals I stumble upon. However one thing which I fear is the automatic choke on the replacement Solex Z1 I sourced. Namely, it all works well...all apart from the idle. I can adjust the idle RPM with the screw on the back, but that only goes so far. The issue I'm having is that the automatic choke seems to be...backwards.
Here's how it works. When I cold start the engine, the RPM is barely enough to keep the engine idle (I'd wager it's around 600 RPM). However as it heats up, the RPM goes to as high as 1200 RPM. A part of me thinks it should be the other way around (because I can adjust the cold idle to be 900 RPM, but then the hot RPM raises to like 1500 which isn't optimal). Are there any other adjustments I can do on these carbs to remedy this?
Many thanks in advance!

[Jugostran]

For anyone stumbling upon this thread looking for answers:
https://www.forum-405.com/t21591-tuto-f ... -34-34-z-1
The above page (in a cryptic language known only as "French") details the adjustment instructions of the Solex Z1 34/34 (new style), which is similar to the one fitted in later BXs (1990 onward). I dug around a bit and found two key adjustments.
(full image credit goes to xi, the author of the above tutorial)


Here you should note the position of the idle adjustment screw, marked "I". As far as my limited understanding goes, that screw adjusts the "global" idle speed (both hot and cold). For example if you adjust it to 900 RPM cold, the engine will idle at 1500 RPM warm. This screw is to be fine tuned when the engine is at operating temperature.


Here we note the position of the fast idle adjustment screw, marked "V". This is a key adjustment in the Solex Z1 auto-choke mechanism. When the engine is cold, the thermo-diaphragm will engage the fast idle screw to help the engine start and run until it gets up to temperature. Once the engine is up to temperature, the fast idle will gradually disengage (until fully disengaged - this may also have to be adjusted separately if it does not fully disengage) and the idle will after that be governed by the idle adjustment screw marked "I". The fast idle screw is to be adjusted only when the engine is cold (let the car sit for a few hours before attempting). Depending on the temperature you are working in, the fast idle should be adjusted accordingly (from 1500 RPM at 30 degrees Celsius to around 2000 RPM at 5 degrees Celsius).

I will update this thread once I attempt this adjustment on my car.