Mercury Carburetor Inlet Needle & Seat Kit – Fits Mercury/Mariner 40-150 HP Outboards
Mercury Carburetor Inlet Needle & Seat Kit – Fits Mercury/Mariner 40-150 HP Outboards is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Mercury Carburetor Inlet Needle & Seat Kit – Fits Mercury/Marin...
Product Details
This Mercury Carburetor Inlet Needle & Seat Kit provides a reliable solution for regulating fuel flow in your marine engine's carburetor. It is designed for a broad range of Mercury and Mariner 2-stroke outboards from 40 to 150 HP, covering various models manufactured from the 1970s through the 1990s. The kit is also compatible with select Johnson/Evinrude models that specify OEM part number 0509053.
This component serves as a direct replacement for Mercury parts 1395-8318, 1395-83181, and 83181; Sierra 18-7061; GLM 40910; and Johnson/Evinrude 0509053, ensuring a precise fit and function.
- Installation Method: Direct replacement
- Primary Material: Durable brass housing for corrosion resistance
- Function: Includes carburetor needle valve with seat for fuel flow regulation
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 1395-8318 |
| Mercury | 1395-83181 |
| Mercury | 83181 |
| Sierra | 18-7061 |
| GLM | 40910 |
| Johnson/Evinrude | 0509053 |
Engine & Model Compatibility
Confirm your engine model in the table below. Note that an exact year range is not available, so cross-verification with your OEM part number is essential.
For Mercury/Mariner owners: This kit fits a wide variety of 2-stroke inline and V-cylinder models. The "Notes" column often refers to specific WMK or KC series carburetors used on these engines.
For Johnson/Evinrude owners: Compatibility is based on a direct part number cross-reference. Please verify that your engine uses OEM part 0509053 before ordering.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | 115 (6-Cylinder Inline) | 115 | 2-Stroke | 1395-8318 1 | WMK-3, 10, 15, 18, 26, 28, 32, 36, 40, 41 |
| Mercury | 90 (6-Cylinder Inline) | 90 | 2-Stroke | 1395-8318 1 | WMK-23, 27, 30, 35, 39 |
| Mercury | 85 (850) (4-Cylinder) | 85 | 2-Stroke | 1395-8318 1 | WMK-4, 16, 17 |
| Mercury | 80 (4-Cylinder) | 80 | 2-Stroke | 1395-8318 1 | Various models |
| Mercury | 65 (650) (3-Cylinder) | 65 | 2-Stroke | 1395-8318 1 | WMK-5, 12, 13, 20; WM-2, WM-4 |
| Mercury | 50 (4-Cylinder) | 50 | 2-Stroke | 1395-8318 1 | WMK-8 |
| Mercury | 40 (2-Cylinder) | 40 | 2-Stroke | 1395-8318 1 | WMK-1, 8, 21, 24, 31, 33, 34, 38 |
| Mercury | 35 (2-Cylinder) | 35 | 2-Stroke | 1395-8318 1 | KC-4A, 8A, 9A, 9B, 9C, 13A |
| Mercury | 140 (140, 1400) (6-Cylinder Inline) | 140 | 2-Stroke | 1395-8318 1 | WMK-7, 9, 25, 29 |
| Mercury | 150 (1500) (6-Cylinder Inline) | 150 | 2-Stroke | 1395-8318 1 | WMK-11, 14, 19, 22 |
| Mercury | 135 (1350) (6-Cylinder Inline) | 135 | 2-Stroke | 1395-8318 1 | KD-7A, 7B; WMK-4 |
| Mercury | 125 (1250) (6-Cylinder Inline) | 125 | 2-Stroke | 1395-8318 1 | KD-1A, 1B, 2A, 3A |
| Johnson/Evinrude | 2-Stroke | 0509053 | Cross-referenced in source data |
Technical Specs
- Product Type
- Carburetor Inlet Needle & Seat Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Housing Material
- Brass
- Product Dimensions
- 4.0" (H) x 4.0" (W) x 1.25" (L)
- Box Dimensions
- 4.0" (H) x 4.0" (W) x 1.25" (L)
- Warranty
- Varies by manufacturer - typically 1 year
What’s in the Box
- 1 x Valve Seat Kit (1395-83181)
Installation Notes
- Ensure the replacement kit's part number matches your engine's requirements.
- Disconnect the battery and fuel line, following all safety precautions for handling gasoline.
- Carefully remove the carburetor assembly from the engine. Take pictures to aid reassembly.
- Disassemble the carburetor on a clean workbench to access the float bowl and old needle and seat.
- Remove the old needle from the float and unscrew the seat from the carburetor body.
- Clean the carburetor body and float bowl thoroughly with a dedicated carburetor cleaner.
- Install the new seat, ensuring it is properly threaded and seated. Do not overtighten.
- Install the new needle onto the float and place the assembly back into the carburetor body.
- Reassemble the carburetor, reinstall it on the engine, and reconnect the fuel line.
- Before starting the engine, prime the fuel system and check carefully for any leaks.
Troubleshooting & FAQ
How do I know if I need a new needle and seat kit?
Common signs of a failing needle and seat include fuel leaking from the carburetor (overflowing), the engine flooding, difficulty starting, or poor idle. These symptoms occur because the needle no longer seals against the seat, allowing excess fuel into the float bowl.
My engine model is listed, but how can I be sure it fits without a year range?
Because manufacturers often used different carburetors on the same engine model over its production run, the most reliable way to confirm fitment is to match the OEM part number from your engine's service manual or by inspecting the existing part. The "Notes" column (referencing WMK, KC, etc.) can also help identify the correct carburetor series.
What is the difference between part number 1395-8318 and 1395-83181?
The part number '1395-83181' (with the '1' suffix) is generally the updated or current part number that supersedes '1395-8318'. They are functionally identical and interchangeable. This kit replaces both versions.
Can this kit be used with gasoline containing ethanol?
Yes, this kit is designed for use with standard marine gasoline, which may include ethanol blends (up to E10). However, prolonged exposure to higher concentrations of ethanol can accelerate wear on all fuel system components.
Why is it important to replace both the needle and the seat?
The needle and seat wear together as a matched set. Replacing only one component can result in an improper seal, leading to persistent fuel leaks or flow issues. For a reliable repair, always install them as a pair.
What does OEM vs. Aftermarket mean?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
What are the shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty & return policy?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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