choke tube 36mm 2pcs WEBER 45 DCOE main venturi FAJS SALE
$ 18.5
Part number: ST4139
Manufacturer: FAJS
36 mm Main Venturi Chokes for Weber 45 DCOE Carburetors - Pair | FAJS | MPN ST4139x2
These main venturis, also called chokes, control the effective airflow diameter inside a Weber 45 DCOE carburetor. The reduced venturi section creates the pressure signal that draws fuel through the main circuit, so venturi size directly influences fuel metering signal, progression into the main system, airflow capacity, and transient response.
36 mm venturi size provides a specific airflow and signal characteristic within the DCOE calibration. A different choke size can alter mixture behavior and the engine’s response under load, so the venturi should be matched to the engine, carburetor setup, and existing jetting. These parts are new and unused, having been removed from unused carburetors. This is a sale item.
This replacement part is suitable for carburetor service and restoration work where the original component is worn, damaged, or missing.
Reference/MPN: ST4139x2.
Technical role: These 36 mm main venturi chokes control airflow and the fuel-metering signal in Weber 45 DCOE carburetors.
Service relevance: The pair is a replacement for worn or missing DCOE main venturis and can affect airflow, mixture behavior, and engine response.
What Is Included
- Two 36 mm main venturi chokes for Weber 45 DCOE carburetors
Important Fitment Note
Verify the carburetor family and body marking before purchase: these venturis are intended for Weber 45 DCOE applications. Confirm the 36 mm marking or bore size, the venturi profile and locating geometry, and the retaining or seating interface against the parts being replaced. Compare the overall shape, indexing features, and contact surfaces with the removed venturis before installation. MPN: ST4139x2.
Compare the removed part carefully; DCOE variants and related carburetor bodies can use different venturi geometry or retention details.Show all parts
