Cylinder Head Gasket – Fits Yamaha 9.9HP/15HP 2-Stroke Outboards (Replaces 63V-11181-A1-00)
Cylinder Head Gasket – Fits Yamaha 9.9HP/15HP 2-Stroke Outboards (Replaces 63V-11181-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
Cylinder Head Gasket – Fits Yamaha 9.9HP/15HP 2-Stroke Outboards (R...
Product Details
This replacement Cylinder Head Gasket is engineered for Yamaha 9.9HP and 15HP 2-stroke outboard motors manufactured from 1997 and newer. It ensures a precise seal for optimal engine compression and performance.
It serves as a direct interchange for Yamaha part numbers 63V-11181-A1-00, its supersession 63V-11181-A2-00, and SouthMarine 63V-11181-A1-00.
- Designed for direct OEM-spec installation.
- Compatible with 2-stroke gasoline outboard engines.
- Includes one cylinder head gasket as pictured.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 63V-11181-A1-00 | 63V-11181-A2-00 |
| Yamaha | 63V-11181-A2-00 | |
| SouthMarine | 63V-11181-A1-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is designed for the following Yamaha outboard models:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9FMH | 9.9 | 2-Stroke | 1997 and newer | 63V-11181-A1-00 | Superseded by 63V-11181-A2-00 |
| Yamaha | 9.9GMH | 9.9 | 2-Stroke | 1997 and newer | 63V-11181-A1-00 | Superseded by 63V-11181-A2-00 |
| Yamaha | 15FMH | 15 | 2-Stroke | 1997 and newer | 63V-11181-A1-00 | Superseded by 63V-11181-A2-00 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline (2-stroke)
- Dimensions
- 25.5 cm x 14.6 cm x 0.3 cm
- Engine Position
- Outboard
- Position
- Head gasket 1
What’s in the Box
- 1 x Gasket, Cylinder Head 1 (Replaces 63V-11181-A1-00)
Installation Notes
- Disconnect the battery and fuel lines for safety.
- Remove the engine cowling to access the cylinder head.
- Drain the engine's cooling system completely.
- Loosen and remove cylinder head bolts following the reverse sequence specified in your service manual.
- Carefully lift the cylinder head from the engine block.
- Remove the old gasket. Thoroughly clean both the cylinder head and engine block mating surfaces. Ensure they are completely free of old gasket material, oil, and debris.
- Position the new gasket, verifying its correct orientation.
- Reinstall the cylinder head. Tighten the bolts to the manufacturer's specified torque in the correct sequence.
- Reconnect all components, including spark plugs and fuel lines.
- After reassembly, start the engine and carefully check for any coolant, compression, or exhaust leaks around the head.
Troubleshooting & FAQ
How do I know if this gasket fits my Yamaha outboard?
This part fits specific Yamaha 9.9HP and 15HP 2-stroke models from 1997 and newer that use OEM part number 63V-11181-A1-00. Always verify your engine model and part number against the compatibility table or your service manual before ordering.
What are the signs of a failed cylinder head gasket?
Common symptoms of a blown head gasket include engine overheating, loss of power and compression, milky-white engine oil, excessive white exhaust smoke, or visible water/coolant leaks from the engine block.
Is this gasket reusable?
No. Cylinder head gaskets are crush-style components designed for one-time use only. Reusing an old gasket will result in leaks and improper sealing.
Do I need to use a sealant with this gasket?
Typically, modern head gaskets like this are installed dry. Applying additional sealants can interfere with the seal and cause premature failure. Always follow the installation guidelines in your engine's official service manual.
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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