Cylinder Head Gasket – Fits Yamaha 25HP/30HP 2-Stroke (Replaces 61N-11181-A1-00)
Cylinder Head Gasket – Fits Yamaha 25HP/30HP 2-Stroke (Replaces 61N-11181-A1-00) 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 aftermarket Cylinder Head Gasket is engineered for a precise fit on a range of Yamaha 25HP and 30HP 2-Stroke outboard motors from the 1990s to the early 2000s, including popular series like the C30, E25A, 25V, and 30G. It provides a reliable seal essential for maintaining engine compression and performance.
This part is a direct cross-reference for Yamaha OEM part numbers 61N-11181-A0-00, 61N-11181-A1-00, and the current superseded part, 61N-11181-A2-00.
- Installation Method: Direct replacement
- Engine Type: Gasoline 2-Stroke
- Package Contents: One cylinder head gasket
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 61N-11181-A0-00 | 61N-11181-A1-00 |
| Yamaha | 61N-11181-A1-00 | 61N-11181-A2-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, this gasket is compatible with various C-series, G-series, and other international models. Please verify your specific model and year.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | C30ELRV | 30 | 2-Stroke | 1997 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | C30ELRR | 30 | 2-Stroke | 1993 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | C30ELRS | 30 | 2-Stroke | 1994 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | C30MLHS | 30 | 2-Stroke | 1994 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | C30ELRT | 30 | 2-Stroke | 1995 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | C30ERT | 30 | 2-Stroke | 1995 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | C30ELRU | 30 | 2-Stroke | 1996 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | E25A | 25 | 2-Stroke | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 | |
| Yamaha | E25BMH | 25 | 2-Stroke | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 | |
| Yamaha | 25V | 25 | 2-Stroke | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 | |
| Yamaha | 25VM | 25 | 2-Stroke | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 | |
| Yamaha | 30G | 30 | 2-Stroke | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 | |
| Yamaha | E30HMH | 30 | 2-Stroke | Up to 1996 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
| Yamaha | E30H | 30 | 2-Stroke | Up to 1996 | 61N-11181-A1-00 | Superseded by 61N-11181-A2-00 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Housing Material
- Composite/Metal
- Product Dimensions
- 25.5 cm L x 14.5 cm W x 0.2 cm H
- Other Technical Attributes
- OEM specification gasket
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 61N-11181-A1-00)
Installation Notes
- Disconnect the battery and ignition system. Ensure the engine is cool to the touch.
- Remove the engine cowling and any interfering components to access the cylinder head.
- Carefully remove the cylinder head bolts in a crisscross pattern, starting from the outside and working inward.
- Lift the cylinder head off the engine block and remove the old gasket.
- Thoroughly clean both the cylinder head and engine block mating surfaces. Ensure they are free of old gasket material, oil, and debris.
- Position the new gasket correctly on the engine block. Ensure it aligns with all bolt holes and passages.
- Reinstall the cylinder head and tighten the bolts to the manufacturer's specified torque sequence and values.
- Reconnect all components and test the engine for leaks before full operation.
Troubleshooting & FAQ
How do I know if this gasket fits my engine?
The best way to confirm is to check the compatibility table on this page against your engine's model number and year. You can also compare the part number (61N-11181-A1-00 or its superseded versions) to the one listed in your service manual.
What are the signs of a failing cylinder head gasket?
Common symptoms include engine overheating, loss of power, white smoke from the exhaust (burning coolant), milky or foamy engine oil, or visible coolant/oil leaks around the cylinder head.
Do I need to use a sealant with this gasket?
Typically, no. This gasket is designed to be installed dry. Applying sealant can interfere with its ability to seal correctly unless explicitly required by your engine's service manual for specific applications.
Is this the current Yamaha part (61N-11181-A2-00)?
This is an aftermarket replacement that directly interchanges with the original 61N-11181-A1-00 and its subsequent replacement, 61N-11181-A2-00. It is built to the same specifications but is not an OEM Yamaha part.
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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