Mercury / Mariner 20–25 HP Outboard Carburettor – New Old Stock

Carburettor for selected Mercury and Mariner 20 HP and 25 HP 2-stroke, 2-cylinder outboard engines.

Condition: New Old Stock (NOS) – unused older stock. Please inspect all product photographs carefully before purchasing.

Fitment – Mercury / Mariner Outboards

2-Stroke – 2-Cylinder Engines

20 HP – Selected models
25 HP – Selected models

Applicable Serial Number Ranges:

9807909 – 0P016999
0P017000 – 0P325499
0P325500 – 1B342467
0G044027 – 0G760299
0G760300 – 0T979999
0T980000 – 0T999999
1B000001 – 1B351069

Important Exclusion:

Does NOT fit 25 HP models with serial numbers beginning 0N or 1N.

Mercury Part Numbers / References

1390-817405T23
1390-817405T12
1390-817405T20
1390-817405A12

These references are provided for identification. Confirm the exact carburettor configuration and part number before ordering.

Important – Throttle Cam Compatibility

Some Mercury and Mariner 20–25 HP engines have been modified or use different carburettor and throttle linkage arrangements.

Please pay particular attention to the SECOND PRODUCT PHOTO showing the throttle cam.

Before purchasing, compare:

Carburettor body and mounting arrangement
Throttle cam shape and position
Throttle linkage connections
Original carburettor part number
Engine model and serial number

A matching horsepower and serial number alone does not guarantee compatibility.

Product Details

Brand: Mercury / Mariner application
Condition: New Old Stock (NOS)
Product: Outboard Carburettor
Engine Type: 2-Stroke
Cylinders: 2
Horsepower: 20 HP, 25 HP
Main Reference: 1390-817405T23
Quantity: 1 Carburettor

Important – Check Compatibility

If the part looks the same as yours, this does not always mean it is the correct part for your outboard.

Please compare the product photographs, especially the throttle cam, and confirm the original part number before ordering.

Why Buy From SSI Marine?

UK stock – collection from Leigh, Greater Manchester
Same-day dispatch before 1 PM Monday–Friday
Royal Mail Tracked 24
Workshop open Monday–Friday, 9 AM–5 PM
Technical support available
VAT invoice available on request

Buyer Responsibility: Please confirm compatibility before purchasing. Contact SSI Marine with your engine serial number and photographs of your existing carburettor if unsure.

Genuine 20–25 HP Mercury Mariner Outboard Carburettor 2-Stroke 2-Cylinder 1390-817405T23-NOS