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Sortiment» Secondary Throttle Diaphragm Solex / Zenith INAT (4 mm)
Secondary Throttle Diaphragm Solex / Zenith INAT (4 mm)
Secondary Throttle Diaphragm Solex / Zenith INAT (4 mm)
Art.No: 3504
Price: 59.50 EUR
Availability: In Stock
This vacuum diaphragm is an absolutely critical component for the proper operation of classic two-stage progressive carburetors manufactured by Zenith, Solex, and Pierburg (specifically within the INAT series). The diaphragm's primary and vital function is to sense the increased engine vacuum during heavy acceleration and smoothly, automatically pull open the carburetor's secondary throttle valve to deliver maximum engine horsepower.
When the original rubber diaphragm dries out, cracks, or stiffens with old age, it completely loses its ability to react to the delicate vacuum changes. This typically results in the secondary stage failing to open at all, leaving the classic vehicle feeling extremely sluggish, underpowered, and unresponsive at highway speeds or during overtaking maneuvers.
Compatibility and specifications:
- Carburetor models: Fits Solex and Zenith INAT carburetors
- Vehicle fitment: Commonly found as original factory equipment on classic models from BMW, Opel, and Mercedes-Benz
- Thread size: 4 mm (M4 x 0.75) on the outer thread of the metal actuating rod
Important ordering information: There are two visually identical diaphragms available for these specific carburetors. Please carefully measure the thread diameter on your old actuating rod before placing an order. This specific model features a 4 mm thread (M4), whereas the alternative version (part no. 3503) uses a thinner 3 mm thread.
Art.nr: 4177
Art.nr: FK3
Art.nr: 8600
Art.nr: 8601
Art.nr: PK5
Art.nr: 3503
Secondary Throttle Diaphragm Solex / Zenith INAT (4 mm)
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