Solex 40 ADDHE carburetor pump diaphragm late style
$ 19
Part number: ST1115
Made in: Italy
Solex 40 ADDHE Carburetor Pump Diaphragm – Late Style
This late-style pump diaphragm is used in the accelerator-pump circuit of a Solex 40 ADDHE carburetor. When the throttle opens quickly, the diaphragm flexes to operate the pump and provide an additional fuel shot for transient enrichment. This helps control throttle-opening hesitation before the main circuit and progression system respond to the increased airflow.
This replacement part is suitable for carburetor service and restoration work where the original component is worn, damaged, or missing.
Reference/MPN: st1115.
Technical role: Late-style diaphragm for the Solex 40 ADDHE accelerator-pump circuit, flexing to deliver additional fuel during rapid throttle opening.
Service relevance: A replacement is relevant when the pump diaphragm is worn or damaged and transient throttle response is affected.
What Is Included
- Solex 40 ADDHE carburetor pump diaphragm, late style, MPN ST1115
- Made in Italy.
Important Fitment Note
Verify the carburetor family and confirm the ST1115 marking or equivalent identification before purchase. Compare the diaphragm’s outer mounting-hole pattern, overall profile, central actuator or metal-button geometry, and mating seat with the removed part. Check the cover interface and retaining-hardware arrangement, including thread details where applicable. Compare the late-style profile and actuator position directly with the original diaphragm; early and late pump designs may not interchange.
What you see is what you get
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