Cylinder Head Gasket – Fits Yamaha 20C/25D 2-Stroke (Replaces 695-11181-A1-00)
Cylinder Head Gasket – Fits Yamaha 20C/25D 2-Stroke (Replaces 695-11181-A1-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Cylinder Head Gasket – Fits Yamaha 20C/25D 2-Stroke (Replaces 695-1...
Product Details
This Cylinder Head Gasket ensures a perfect seal between the cylinder head and engine block for Yamaha 2-Stroke 20HP (20C) and 25HP (25D) outboards from 1986–2002. It is engineered to prevent compression loss and cooling water leaks, restoring engine performance and reliability.
It serves as a direct replacement for Yamaha part numbers 695-11181-A1-00, 695-11181-A0-00, 695-11181-00-00, and Sierra 18-3849.
- Engineered to withstand harsh marine environments.
- Installation requires removal of the cylinder head.
- Seals compression and prevents water/oil leakage.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 695-11181-A1-00 | Current part number. Supersedes 695-11181-A0-00 and 695-11181-00-00. |
| Yamaha | 695-11181-A0-00 | Superseded by 695-11181-A1-00. |
| Yamaha | 695-11181-00-00 | Superseded by 695-11181-A0-00. |
| Sierra | 18-3849 | Aftermarket cross-reference. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits a wide range of Yamaha 20HP and 25HP 2-Stroke models manufactured between 1986 and 2002.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 20C | 20 | 2-Stroke | 1986–2002 | 695-11181-A1-00 | Supersedes 695-11181-A0-00 and 695-11181-00-00 |
| Yamaha | 25D | 25 | 2-Stroke | 1986–2002 | 695-11181-A1-00 | Supersedes 695-11181-A0-00 and 695-11181-00-00 |
| Yamaha | C25ELHP | 25 | 2-Stroke | 1991 | 695-11181-A1-00 | |
| Yamaha | C25ELRP | 25 | 2-Stroke | 1991 | 695-11181-A1-00 | |
| Yamaha | C25ELRQ | 25 | 2-Stroke | 1992 | 695-11181-A1-00 | |
| Yamaha | C25MSHQ | 25 | 2-Stroke | 1992 | 695-11181-A1-00 | |
| Yamaha | C25ELHR | 25 | 2-Stroke | 1993 | 695-11181-A1-00 | |
| Yamaha | C25ELRR | 25 | 2-Stroke | 1993 | 695-11181-A1-00 | |
| Yamaha | C25MLHR | 25 | 2-Stroke | 1993 | 695-11181-A1-00 | |
| Yamaha | C25MSHR | 25 | 2-Stroke | 1993 | 695-11181-A1-00 | |
| Yamaha | C25ELHS | 25 | 2-Stroke | 1994 | 695-11181-A1-00 | |
| Yamaha | C25ELRS | 25 | 2-Stroke | 1994 | 695-11181-A1-00 | |
| Yamaha | C25MLHS | 25 | 2-Stroke | 1994 | 695-11181-A1-00 | |
| Yamaha | C25MSHS | 25 | 2-Stroke | 1994 | 695-11181-A1-00 | |
| Yamaha | C25ELHT | 25 | 2-Stroke | 1995 | 695-11181-A1-00 | |
| Yamaha | C25ELRT | 25 | 2-Stroke | 1995 | 695-11181-A1-00 | |
| Yamaha | C25MLHT | 25 | 2-Stroke | 1995 | 695-11181-A1-00 | |
| Yamaha | C25MSHT | 25 | 2-Stroke | 1995 | 695-11181-A1-00 | |
| Yamaha | C25ELHU | 25 | 2-Stroke | 1996 | 695-11181-A1-00 | |
| Yamaha | C25ELRU | 25 | 2-Stroke | 1996 | 695-11181-A1-00 | |
| Yamaha | C25MLHU | 25 | 2-Stroke | 1996 | 695-11181-A1-00 | |
| Yamaha | C25MSHU | 25 | 2-Stroke | 1996 | 695-11181-A1-00 | |
| Yamaha | CV25ELD | 25 | 2-Stroke | 1990 | 695-11181-A1-00 | |
| Yamaha | CV25EMLD | 25 | 2-Stroke | 1990 | 695-11181-A1-00 | |
| Yamaha | 25DE | 25 | 2-Stroke | 1992 | 695-11181-A1-00 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct replacement, requires cylinder head removal
- Fuel Type
- 2-Stroke fuel/oil mix
- Connection
- N/A - Compression seal
- Housing Material
- Marine-grade gasket material
- Housing Color
- Black
- Dimensions
- 6.5 in × 9.5 in × 0.25 in
- Working Pressure
- Designed for engine compression pressures
- Other Technical Attributes
- Engineered to withstand marine environments
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 695-11181-A1-00)
Installation Notes
- Disconnect the battery and drain the engine's cooling system completely.
- Carefully remove any components obstructing access to the cylinder head, such as the intake manifold, exhaust, and fuel lines. Label all connections.
- Following the manufacturer's specified pattern, loosen the cylinder head bolts in reverse order of the tightening sequence.
- Lift the cylinder head off the engine block. Avoid using pry tools that could damage the mating surfaces.
- Thoroughly clean all old gasket material from both the cylinder head and the engine block surfaces. Ensure they are clean, dry, and free of defects.
- Position the new head gasket correctly on the engine block; do not use any sealants unless explicitly required.
- Carefully place the cylinder head back onto the block.
- Install and torque the head bolts to the manufacturer's specifications, following the correct sequence and torque stages.
- Reinstall all previously removed components.
- Refill the cooling system, reconnect the battery, and start the engine, checking for any leaks.
Troubleshooting & FAQ
How do I know if my head gasket is failing?
Common signs of a blown head gasket include engine overheating, loss of power, white smoke from the exhaust (burning coolant), milky or foamy oil, or visible coolant/oil leaks from the engine block and head joint.
Will this gasket fit a 25HP model not on the list?
This gasket is specifically designed for the Yamaha 20C and 25D series models listed. While it may fit other models, we cannot guarantee compatibility. Always verify your engine's required OEM part number before ordering.
What is the recommended replacement interval?
The head gasket is not a routine maintenance item. It should only be replaced when it fails or during a major engine overhaul. Its lifespan depends on engine condition, operating hours, and environmental factors.
Do I need to use sealant with this gasket?
In almost all cases, you should install this gasket dry without any additional sealants. The gasket is designed to create a seal under compression. Using sealant can interfere with this process and may lead to premature failure. Always follow your engine's service manual.
Is this part different from the original Yamaha part?
This is an aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It offers a cost-effective solution without compromising on quality or performance.
What tools are required for installation?
You will need a comprehensive socket set, a torque wrench capable of reading your engine's specifications, gasket scrapers (plastic or brass recommended), and standard hand tools. A copy of your engine's service manual is essential for torque specs and bolt sequences.
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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