Main Jet M6 for Holley size 50-55-60-65-70-75-80-85-90-95-100-105-110-115-120
$ 7.3
Part number: ST1681
Made in: EU
Main Jet M6 for Holley and JIKOV SEDR/EDSR – Sizes 50–200, MPN ST1681
This M6 main jet is used in the carburetor’s main fuel circuit to meter fuel as airflow and engine load increase. Main-jet selection directly influences mixture strength during sustained acceleration, higher-load operation, and wide-open-throttle tuning. A larger jet number generally allows more fuel flow, while a smaller number generally provides less fuel; final calibration also depends on the carburetor, engine airflow, air correction system, emulsion arrangement, fuel level, and operating conditions.
Thread specification: 1/4-32. The jet is listed for Holley applications and also for JIKOV SEDR/EDSR carburetors. It can be used during carburetor rebuilding, replacement of a damaged or obstructed jet, or mixture calibration after changes to engine specification or intake and exhaust airflow. Incorrect main-jet selection may contribute to lean or rich operation under load, reduced transient response, poor high-load performance, or excessive fuel consumption.
Available size designations are 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 185, 190, 195, and 200. Confirm the required calibration size before ordering. The part is identified by MPN ST1681.
This replacement part is suitable for carburetor service and restoration work where the original component is worn, damaged, or missing.
Reference/MPN: ST1681.
Technical role: M6 main jet for the Holley main fuel circuit, with available size markings from 50 to 120 listed for this item.
Service relevance: Used for replacement or main-circuit mixture calibration during carburetor service, with jet size affecting fuel delivery under load.
What Is Included
- One M6 main jet in the selected available size
- Made in EU.
Important Fitment Note
Verify the carburetor family before purchase: Holley or JIKOV SEDR/EDSR. Confirm the jet marking or required size, the 1/4-32 thread, the threaded-body geometry, screwdriver-slot configuration, and the seating or interface arrangement inside the carburetor. Compare the replacement directly with the removed jet, including thread engagement, shoulder position, overall profile, and calibration marking.
Do not rely on the “M6” designation alone; verify the 1/4-32 thread and the complete jet geometry against the original part and carburetor specification.Show all parts
