Carburetor Gasket – Fits Mercury Marine 20-45 HP Outboards (Replaces 27-757911)
Carburetor Gasket – Fits Mercury Marine 20-45 HP Outboards (Replaces 27-757911) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This replacement Carburetor Gasket ensures a proper seal between the carburetor and intake manifold on a wide range of Mercury Marine 2-stroke outboard engines from the 1970s to the 1990s. It is designed for 20-45 HP models, including SEA PRO, MARATHON, and JET variants, providing a direct-fit solution to prevent vacuum and fuel leaks.
It directly replaces OEM part numbers Mercury 27-757911, 27-75791, 27-64659, and 27-26891, following the complete supersession chain for these models.
- Installation: Mounts directly between the carburetor base and engine intake manifold.
- Material: High-strength, composite paper construction designed for marine environments.
- Fuel System: Compatible with standard 2-stroke gasoline and oil mixtures.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury | 27-26891 | 27-64659 |
| Mercury | 27-64659 | 27-75791 |
| Mercury | 27-75791 | 27-757911 |
| Mercury | 27-757911 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury Marine models, check your serial number range to confirm compatibility.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 20 (2 CYL.) | 20 | 2-Stroke | 0A730007 & Up | 27-757911 | |
| Mercury | 20 (2 CYL.) | 20 | 2-Stroke | 0B238464-0G044026 | 27-757911 | |
| Mercury | 20 (2 CYL.) | 20 | 2-Stroke | 9507381-9807908 | 27-757911 | |
| Mercury | 25, 25 MARATHON, SUPER 15 (2 CYL.) | 25 | 2-Stroke | 0A730007 & Up | 27-757911 | |
| Mercury | 25, 25 MARATHON, SUPER 15 (2 CYL.) | 25 | 2-Stroke | 0B238464-0G044026 | 27-757911 | |
| Mercury | 25, 25 MARATHON, SUPER 15 (2 CYL.) | 25 | 2-Stroke | 9507381-9807908 | 27-757911 | |
| Mercury | 25, 25 SEA PRO, SUPER 15 (2 CYL.) | 25 | 2-Stroke | 0A730007 & Up | 27-757911 | |
| Mercury | 25, 25 SEA PRO, SUPER 15 (2 CYL.) | 25 | 2-Stroke | 0B238464-0G044026 | 27-757911 | |
| Mercury | 25, 25 SEA PRO, SUPER 15 (2 CYL.) | 25 | 2-Stroke | 9507381-9807908 | 27-757911 | |
| Mercury | 30 JET | 30 | 2-Stroke | 9570790 & Up | 27-757911 | |
| Mercury | 40 JET 30 JET | 40/30 | 2-Stroke | 0C159200-0G589999 | 27-757911 | |
| Mercury | 40 (4 CYL.) | 40 | 2-Stroke | 0C159200 & Up | 27-757911 | |
| Mercury | 40 (4 CYL.) | 40 | 2-Stroke | 9570790 & Up | 27-757911 | |
| Mercury | 45 (4 CYL.) | 45 | 2-Stroke | 0A719281 & Up | 27-757911 | |
| Mercury | 45 (4 CYL.) | 45 | 2-Stroke | 0B110789 & Up | 27-757911 | |
| Mercury | 45 (4 CYL.) | 45 | 2-Stroke | 9466692 & Up | 27-757911 |
Technical Specs
- Product Type
- Carburetor Gasket
- Installation
- Direct fit between carburetor and engine intake
- Fuel Type
- Gasoline (2-stroke mixture)
- Material
- Composite/Paper
- Dimensions
- 7.25 in x 6.0 in x 0.13 in
What’s in the Box
- 1 x Gasket (Replaces 27-757911)
Installation Notes
- Turn off the fuel supply and disconnect the battery. Remove the engine cover and airbox to access the carburetor.
- Note the locations of and then disconnect all linkages and fuel lines from the carburetor.
- Unbolt and carefully remove the carburetor from the engine's intake manifold.
- Remove the old carburetor gasket. Thoroughly clean both the carburetor's base and the intake manifold's mating surface to ensure a perfect seal.
- Position the new gasket, making sure all bolt holes and passages align correctly.
- Reinstall the carburetor, tightening bolts evenly. Reconnect all lines and linkages, then check for leaks before starting.
Troubleshooting & FAQ
How do I know if my carburetor gasket has failed?
Common signs of a bad gasket include a rough or unstable idle, stalling, visible fuel leaks around the carburetor base, or a distinct hissing sound, which indicates a vacuum leak. Engine performance may also suffer due to an incorrect air-fuel mixture.
Is this gasket compatible with all 20-45 HP Mercury engines?
It fits a wide variety of 2-stroke models from the 1970s through 1990s, but compatibility is determined by the engine's serial number, not just the year or horsepower. Always verify your serial number against the ranges listed in the compatibility table.
Do I need to use sealant with this gasket?
Generally, no. This type of gasket is designed to create a seal on its own when installed on clean, flat surfaces. Applying additional sealant can sometimes interfere with a proper seal or lead to excess material entering the engine.
What is the difference between part number 27-757911 and 27-75791?
Part number 27-757911 is the most current OEM part number in the supersession chain. It directly replaces the older 27-75791, along with predecessors 27-64659 and 27-26891, ensuring the latest design and material specifications.
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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