Exhaust Inner Cover Gasket – Fits Yamaha 4HP & 5HP Outboards (Replaces 6E0-41112-A1-00)
Exhaust Inner Cover Gasket – Fits Yamaha 4HP & 5HP Outboards (Replaces 6E0-41112-A1-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Inner Cover Gasket – Fits Yamaha 4HP & 5HP Outboards (R...
Product Details
This is an aftermarket Exhaust Inner Cover Gasket – Fits Yamaha 4HP & 5HP Outboards (Replaces 6E0-41112-A1-00), designed to OEM specifications. It is a direct-fit replacement for various 4HP and 5HP Yamaha outboard models from the 1980s through the 1990s, creating a crucial seal between the exhaust inner cover and the engine block.
It serves as a direct replacement for Yamaha part numbers 6E0-41112-A1-00 and 6E0-41112-01-00, and also cross-references to Mariner part 27-99995M.
- Engineered for direct placement between the exhaust inner cover and the cylinder/crankcase.
- Creates a reliable seal to prevent exhaust leaks within the engine assembly.
- Made from durable materials to withstand engine heat and pressure.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6E0-41112-A1-00 | Current OEM Number |
| Yamaha | 6E0-41112-01-00 | Superseded by 6E0-41112-A1-00 |
| Mariner | 27-99995M | Interchange part number |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits a wide range of 2-stroke Yamaha 4HP and 5HP outboards produced between 1984 and 1999.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | 4LD | 4 | 2-Stroke | 1990 | 6E0-41112-A1-00 |
| Yamaha | 4LF | 4 | 2-Stroke | 1989 | 6E0-41112-A1-00 |
| Yamaha | 4LG | 4 | 2-Stroke | 1988 | 6E0-41112-A1-00 |
| Yamaha | 4LH | 4 | 2-Stroke | 1987 | 6E0-41112-A1-00 |
| Yamaha | 4LJ | 4 | 2-Stroke | 1986 | 6E0-41112-A1-00 |
| Yamaha | 4LK | 4 | 2-Stroke | 1985 | 6E0-41112-A1-00 |
| Yamaha | 4LN | 4 | 2-Stroke | 1984 | 6E0-41112-A1-00 |
| Yamaha | 4MLHP | 4 | 2-Stroke | 1991 | 6E0-41112-A1-00 |
| Yamaha | 4MLHQ | 4 | 2-Stroke | 1992 | 6E0-41112-A1-00 |
| Yamaha | 4MLHR | 4 | 2-Stroke | 1993 | 6E0-41112-A1-00 |
| Yamaha | 4MLHS | 4 | 2-Stroke | 1994 | 6E0-41112-A1-00 |
| Yamaha | 4MLHT | 4 | 2-Stroke | 1995 | 6E0-41112-A1-00 |
| Yamaha | 4MLHU, 4MLHU2 | 4 | 2-Stroke | 1996 | 6E0-41112-A1-00 |
| Yamaha | 4MLHV | 4 | 2-Stroke | 1997 | 6E0-41112-A1-00 |
| Yamaha | 4MLHW | 4 | 2-Stroke | 1998 | 6E0-41112-A1-00 |
| Yamaha | 4MLHX | 4 | 2-Stroke | 1999 | 6E0-41112-A1-00 |
| Yamaha | 4MSHP | 4 | 2-Stroke | 1991 | 6E0-41112-A1-00 |
| Yamaha | 4MSHQ | 4 | 2-Stroke | 1992 | 6E0-41112-A1-00 |
| Yamaha | 4MSHR | 4 | 2-Stroke | 1993 | 6E0-41112-A1-00 |
| Yamaha | 4MSHS | 4 | 2-Stroke | 1994 | 6E0-41112-A1-00 |
| Yamaha | 4MSHT | 4 | 2-Stroke | 1995 | 6E0-41112-A1-00 |
| Yamaha | 4MSHU, 4MSHU2 | 4 | 2-Stroke | 1996 | 6E0-41112-A1-00 |
| Yamaha | 4MSHV | 4 | 2-Stroke | 1997 | 6E0-41112-A1-00 |
| Yamaha | 4MSHW | 4 | 2-Stroke | 1998 | 6E0-41112-A1-00 |
| Yamaha | 4MSHX | 4 | 2-Stroke | 1999 | 6E0-41112-A1-00 |
| Yamaha | 4SD | 4 | 2-Stroke | 1990 | 6E0-41112-A1-00 |
| Yamaha | 4SF | 4 | 2-Stroke | 1989 | 6E0-41112-A1-00 |
| Yamaha | 4SG | 4 | 2-Stroke | 1988 | 6E0-41112-A1-00 |
| Yamaha | 4SH | 4 | 2-Stroke | 1987 | 6E0-41112-A1-00 |
| Yamaha | 4SJ | 4 | 2-Stroke | 1986 | 6E0-41112-A1-00 |
| Yamaha | 4SK | 4 | 2-Stroke | 1985 | 6E0-41112-A1-00 |
| Yamaha | 4SN | 4 | 2-Stroke | 1984 | 6E0-41112-A1-00 |
| Yamaha | 5LK | 5 | 2-Stroke | 1985 | 6E0-41112-A1-00 |
| Yamaha | 5LN | 5 | 2-Stroke | 1984 | 6E0-41112-A1-00 |
| Yamaha | 5MLHT | 5 | 2-Stroke | 1995 | 6E0-41112-A1-00 |
| Yamaha | 5MLHU, 5MLHU2 | 5 | 2-Stroke | 1996 | 6E0-41112-A1-00 |
| Yamaha | 5MLHV | 5 | 2-Stroke | 1997 | 6E0-41112-A1-00 |
| Yamaha | 5MLHW | 5 | 2-Stroke | 1998 | 6E0-41112-A1-00 |
| Yamaha | 5MLHX | 5 | 2-Stroke | 1999 | 6E0-41112-A1-00 |
| Yamaha | 5MSHS | 5 | 2-Stroke | 1994 | 6E0-41112-A1-00 |
| Yamaha | 5MSHT | 5 | 2-Stroke | 1995 | 6E0-41112-A1-00 |
| Yamaha | 5MSHU, 5MSHU2 | 5 | 2-Stroke | 1996 | 6E0-41112-A1-00 |
| Yamaha | 5MSHV | 5 | 2-Stroke | 1997 | 6E0-41112-A1-00 |
| Yamaha | 5MSHW | 5 | 2-Stroke | 1998 | 6E0-41112-A1-00 |
| Yamaha | 5MSHX | 5 | 2-Stroke | 1999 | 6E0-41112-A1-00 |
| Yamaha | 5SK | 5 | 2-Stroke | 1985 | 6E0-41112-A1-00 |
| Yamaha | 5SN | 5 | 2-Stroke | 1984 | 6E0-41112-A1-00 |
Technical Specs
- Product Type
- Exhaust Inner Cover Gasket
- Installation
- Direct placement between exhaust inner cover and engine
- Dimensions
- 16.5 cm L x 11.5 cm W x 0.2 cm H
- Other Technical Attributes
- Located between the exhaust inner cover and the cylinder/crankcase
What’s in the Box
- 1 x Gasket, Exhaust Inner Cover (Replaces 6E0-41112-A1-00)
Installation Notes
- Disconnect the battery and ensure the engine is cool to the touch.
- Locate and remove the exhaust inner cover bolts and the cover itself. This will expose the old gasket.
- Carefully remove the old gasket. Use a plastic scraper if necessary to avoid scratching the metal surfaces.
- Thoroughly clean both the engine block and the exhaust inner cover mating surfaces. All old gasket material and carbon buildup must be removed for a proper seal.
- Position the new gasket correctly. Ensure any alignment holes match up perfectly.
- Reinstall the exhaust inner cover and tighten the bolts to the manufacturer's specified torque in a star or crisscross pattern to ensure even pressure.
- Once secured, reconnect the battery and check for exhaust leaks upon starting the engine.
Troubleshooting & FAQ
How do I know if my exhaust inner cover gasket is failing?
Signs of a bad gasket include a noticeable exhaust leak (hissing or ticking sound from the engine), a smell of exhaust fumes, decreased engine performance, or visible soot/carbon tracking around the exhaust cover mating area.
Can I reuse my old gasket?
No. Gaskets are designed for one-time use. They compress and deform to create a seal. Reusing an old gasket will almost certainly result in a leak. Always replace it with a new one when the component is removed.
Is any sealant required with this gasket?
Generally, this type of gasket is designed to be installed dry. Applying sealant can sometimes interfere with its ability to seal properly. Always follow the engine manufacturer's service manual for specific recommendations.
Will this fit my Mariner outboard?
This part cross-references to Mariner 27-99995M, which is used on some 4HP and 5HP 2-stroke models. However, as specific Mariner model data is not available, it is crucial to verify the part number and visually compare your old gasket to the product images before ordering.
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.
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