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Opeler
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If the Opel Solex throttle diameter size is approximately 32/ 32 and the Weber is 32/ 36, I would enlarge or trim the heat shield and gaskets to match the Weber 36 mm secondary opening.

Diameter: 32 mm = 1.26 in; 36 mm = 1.42 in. The difference of 4 mm is 0.16 inch.

When the carburetor is installed, check that the throttle bores open completely and gaskets/ heat shield do not interfere.

Check for vacuum leaks:
Run engine at warm idle, then spray carburetor cleaner at all gasket, hose, and hardware junctions to the intake manifold. If the idle speed suddenly changes at a location, you have a vacuum leak.
 

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Run engine at warm idle, then spray carburetor cleaner at all gasket, hose, and hardware junctions to the intake manifold. If the idle speed suddenly changes at a location, you have a vacuum leak.
Could you repeat that, and explain better? What does that sudden change means? That the carburetor spray, being flamable, is sucked in and burned?

Thanks a lot
 

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Could you repeat that, and explain better? What does that sudden change means? That the carburetor spray, being flamable, is sucked in and burned?

Thanks a lot
The carb cleaner will seal, momentarily, where there is a vacuum leak, however small the leak may be, the "change" you will notice is when the rough running motor smooths out temporarily when the carb spray finds the vacuum leak.
 

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I've also used a propane torch with the head cutoff and a short piece of hose to locate leaks.

If your lucky enough to have a O2 sensor installed it'll tattle tail small leaks.

Then there's the smoke machine ..here.. a much safer way to find vacuum leaks. It runs on, of all things, Baby Oil!
 
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