Cylinder Head Gasket – Fits Yamaha Outboard 50HP/60HP/70HP 2-Stroke (Replaces 6H3-11181-A0/A1/A2)
Cylinder Head Gasket – Fits Yamaha Outboard 50HP/60HP/70HP 2-Stroke (Replaces 6H3-11181-A0/A1/A2) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Yamaha Outboard 50HP/60HP/70HP 2-Stroke...
Product Details
This Cylinder Head Gasket – Fits Yamaha Outboard 50HP/60HP/70HP 2-Stroke (Replaces 6H3-11181-A0/A1/A2) provides a reliable seal for a range of Yamaha 2-stroke outboard engines. It is engineered for 50HP, 60HP, and 70HP models manufactured between 1984 and 2009, covering various international and US market designations.
This part directly cross-references with Yamaha OEM numbers 6H3-11181-A0-00, 6H3-11181-A1-00, and 6H3-11181-A2-00, along with popular aftermarket equivalents from Sierra (18-3831), GLM (34940), and EMP (27-00655).
- Installation Method: Direct OEM Replacement
- Engine Environment: Designed for 2-stroke gasoline (petrol) outboard engines
- Included in Package: One cylinder head gasket
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6H3-11181-A2-00 |
| Yamaha | 6H3-11181-A1-00 |
| Yamaha | 6H3-11181-A0-00 |
| Sierra | 18-3831 |
| GLM | 34940 |
| EMP | 27-00655 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed exclusively for specific Yamaha outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 50G, 50GEO, 50GETO | 50 | 2-Stroke | 1993–2002 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 50ETK | 50 | 2-Stroke | 1993–1999 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | K50 | 50 | 2-Stroke | 1997–2001 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 60F, 60FE, 60FET | 60 | 2-Stroke | 1984–2009 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 60FEO, 60FETO | 60 | 2-Stroke | 1987–1996 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 60TLR series | 60 | 2-Stroke | 1991–2006 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | C60ELRY, C60TLRY | 60 | 2-Stroke | 1998–2002 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | P60TLH series | 60 | 2-Stroke | 1991–2004 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | E60H, E60MH series | 60 | 2-Stroke | 1990–2009 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 70B | 70 | 2-Stroke | 1984–2003 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 70BE, 70BETO, 70BETOL | 70 | 2-Stroke | 1993–2009 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 70ETL series | 70 | 2-Stroke | 1984–1990 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 70TLR series | 70 | 2-Stroke | 1991–2006 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | C70TLRY, C70TLRZ | 70 | 2-Stroke | 1998–2000 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
| Yamaha | 25B | 25 | 2-Stroke | 1994–1995 | 6H3-11181-A2-00 | Supersedes 6H3-11181-A0-00, 6H3-11181-A1-00 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct OEM Replacement
- Fuel Type
- Gasoline (Petrol)
- Engine Type
- For 2-stroke outboard engines
- Dimensions
- 6.5 in x 15.63 in x 0.13 in
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 6H3-11181-A2-00)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery.
- Remove the engine cowling and any components blocking access to the cylinder head.
- Carefully label and disconnect spark plug wires.
- Following the service manual's specified sequence, loosen and remove the cylinder head bolts.
- Gently lift the cylinder head off the engine block. Avoid using pry tools that could damage the mating surfaces.
- Remove the old head gasket.
- Thoroughly clean all residue from the cylinder head and engine block surfaces. Use a plastic scraper and an appropriate solvent.
- Position the new gasket, ensuring all bolt holes and passages align correctly.
- Reinstall the cylinder head and tighten the bolts to the torque and sequence specified in your official service manual.
- Reassemble all previously removed components in reverse order.
- Reconnect the battery, start the engine, and carefully inspect for any leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
This gasket is designed for Yamaha 50, 60, and 70 HP 2-stroke outboards (1984–2009). The most reliable method is to cross-reference your engine's model and year with our compatibility table and verify it replaces your existing part number (e.g., 6H3-11181-A0).
What are the signs of a bad cylinder head gasket?
Common symptoms of a blown head gasket include engine overheating, a noticeable loss of power, milky or foamy engine oil, or persistent white smoke from the exhaust after the engine has warmed up.
Should I use sealant or adhesive with this gasket?
Most modern head gaskets, including this one, are designed to be installed dry. Applying sealants can interfere with the gasket's ability to create a proper seal. Always consult your engine's official service manual for model-specific instructions.
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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