Carburetor Gasket – Fits Mercury/Mariner 120–200 HP (Replaces Mercury Marine 27-904301)
Carburetor Gasket – Fits Mercury/Mariner 120–200 HP (Replaces Mercury Marine 27-904301) 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
Carburetor Gasket – Fits Mercury/Mariner 120–200 HP (Replaces Mercu...
Product Details
This aftermarket Carburetor Gasket – Fits Mercury/Mariner 120–200 HP (Replaces Mercury Marine 27-904301) is an essential component for servicing Mercury/Mariner 3-Cyl and 6-Cyl engines, from 120 HP to 200 HP, covering model years 1976 to 1994.
It serves as a direct cross-reference for Mercury Marine part numbers 27-90430 and 27-904301, WSM 516-24, and GLM 32120.
- Installation Location: Carburetor Mounting
- Manufacturing Origin: Made in Italy (WSM)
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 27-904301 | Supersedes part number 27-90430 |
| WSM | 516-24 | |
| GLM | 32120 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mariner models, check your specific engine series, horsepower, and year range to ensure a correct fit.
| Brand | Model | Rated HP | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | 3 Cyl | 120 | 1991–1994 | 27-904301 | |
| Mercury | 6 Cyl | 135 | 1986–1991 | 27-904301 | 3.125 Bore 2L |
| Mercury | 6 Cyl | 140 | 1991–1992 | 27-904301 | |
| Mercury | 6 Cyl | 150 | 1978–1989 | 27-904301 | 3.125 Bore 2L |
| Mercury | 6 Cyl | 150 | 1988–1991 | 27-904301 | 3.375 Steel Bore 2.4L XR-4 |
| Mercury | 6 Cyl | 150 | 1986–1988 | 27-904301 | 3.125 Bore 2L XR2 |
| Mercury | 6 Cyl | 175 | 1976–1981 | 27-904301 | 3.125 Bore 2L |
| Mercury | 6 Cyl | 175 | 1981–1982 | 27-904301 | 3.375 Bore 2.4L |
| Mercury | 6 Cyl | 175 | 1983–1990 | 27-904301 | 3.375 Chrome Bore 2.4L |
| Mercury | 6 Cyl | 175 | 1989–1990 | 27-904301 | 3.501 Bore 2.5L EFI |
| Mercury | 6 Cyl | 200 | 1978–1982 | 27-904301 | 3.375 Bore 2.4L |
| Mercury | 6 Cyl | 200 | 1982–1988 | 27-904301 | 3.375 Chrome Bore 2.4L |
| Mercury | MAGNUM II | 0C100861 THRU 0C239552 | 27-904301 | ||
| Mercury | V-135 | 0C100861 THRU 0C239552 | 27-904301 | ||
| Mercury | V-150 | 0C100861 THRU 0C239552 | 27-904301 | ||
| Mercury | V-175 | 0C100861 THRU 0C239552 | 27-904301 | ||
| Mercury | XR-4 | 0C100861 THRU 0C239552 | 27-904301 | ||
| Mercury | MERC MOD-VP | 0B290000 AND UP | 27-904301 | ||
| Mercury | MERC XR2 | 0B290314 THRU 0C276429 | 27-904301 | ||
| Mercury | MERC/MAR 2.4L (CARB) | 0C175045 AND UP | 27-904301 | ||
| Mercury | S2000 | 0D030200 & Up | 27-904301 | ||
| Mercury | SST 120 | 0D030200 & Up | 27-904301 |
Technical Specs
- Product Type
- Gasket
- Installation
- Carburetor Mounting
- Dimensions
- Length: 1.13 in, Width: 7.5 in, Height: 6.0 in
- Weight
- 0.009 kg (0.02 lb)
- Manufacturing Origin
- Made in Italy (WSM)
What’s in the Box
- Gasket (Replaces Mercury Marine 27-904301, WSM 516-24, GLM 32120)
Installation Notes
- Ensure the engine is cool and disconnect the battery for safety.
- Disconnect fuel lines, throttle linkages, and mounting hardware from the carburetor.
- Carefully remove the old carburetor and gasket. Thoroughly clean both mounting surfaces to remove all old gasket material and residue.
- Position the new gasket onto the intake manifold, ensuring all bolt holes and ports align correctly.
- Reinstall the carburetor, tightening the mounting bolts to the manufacturer's specified torque in a crisscross pattern to ensure an even seal.
- Reconnect all fuel lines and linkages, check for leaks, and then reconnect the battery before starting the engine.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
Check the "Engine & Model Compatibility" table on this page. Match your engine's brand, model, horsepower, and year range. For final confirmation, visually compare the gasket shape to your old part before installation.
Do I need sealant with this gasket?
Typically, these carburetor gaskets are designed to be installed dry. Applying sealant can sometimes cause sealing issues or contaminate fuel passages unless explicitly recommended by your engine's service manual. Always start with thoroughly cleaned and dry mating surfaces.
What are the signs of a failing carburetor gasket?
Common symptoms include a rough or unstable idle, engine stalling, visible fuel or vacuum leaks around the base of the carburetor, and poor engine performance or hesitation due to an incorrect air-fuel mixture.
How often should this gasket be replaced?
You should replace the carburetor gasket whenever the carburetor is removed for service, cleaning, or rebuilding. It is a single-use component designed to crush and create a seal, and it will not reliably seal a second time.
OEM vs. Aftermarket?
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.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
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.
Payment & Security
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