Yamaha Exhaust Cover Gasket – Fits Yamaha Outboards 25C, 25ER, 25MH, 25EH (Replaces 664-41114-A0-00)
Yamaha Exhaust Cover Gasket – Fits Yamaha Outboards 25C, 25ER, 25MH, 25EH (Replaces 664-41114-A0-00) is backordered and will ship as soon as it is back in stock.
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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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Yamaha Exhaust Cover Gasket – Fits Yamaha Outboards 25C, 25ER, 25MH...
Product Details
This Yamaha Exhaust Cover Gasket provides a precision seal for the exhaust system on select Yamaha Marine 25HP 2-Stroke outboard engines manufactured between 1990 and 1997, including C25ER, C25MH, and C25EH models.
It serves as a direct interchange for Yamaha part numbers 664-41114-A0-00 (current) and the superseded 664-41114-00-00.
- Installation Method: For replacement use only.
- Material: Manufactured from high-quality, OEM-specified materials for durability and a reliable seal.
- Note: This item is designated as a special order part.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 664-41114-A0-00 | Current Part |
| Yamaha | 664-41114-00-00 | Superseded by 664-41114-A0-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Compatibility for Yamaha models is detailed below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | C25ER(MH)R | 25 | 2-Stroke | 1993 | 664-41114-A0-00 | |
| Yamaha | C25ER(MH/EH)S | 25 | 2-Stroke | 1994 | 664-41114-A0-00 | |
| Yamaha | C25ER(MH/EH)T | 25 | 2-Stroke | 1995 | 664-41114-A0-00 | |
| Yamaha | C25(MH/EH/ER)U | 25 | 2-Stroke | 1996 | 664-41114-A0-00 | |
| Yamaha | C25(MH/EH/ER)V | 25 | 2-Stroke | 1997 | 664-41114-A0-00 | |
| Yamaha | CV25E(EM)D | 25 | 2-Stroke | 1990 | 664-41114-A0-00 | |
| Yamaha | C25E(EM)P | 25 | 2-Stroke | 1990 | 664-41114-A0-00 | |
| Yamaha | C25ER(MH)Q | 25 | 2-Stroke | 1992 | 664-41114-A0-00 |
Technical Specs
- Product Type
- Exhaust Outer Cover Gasket
- Installation
- Replacement Only
- Material
- OEM-Specified Material
- Dimensions
- 25.5 x 14.5 x 1.0
- OEM Part Number
- 664-41114-A0-00
- Application
- Exhaust Cover Sealing
- Warranty
- Standard Yamaha Marine Parts Warranty
- Other Technical Attributes
- Special Order Item
What’s in the Box
- 1 x Gasket, Exhaust Outer Cover (664-41114-A0-00)
Installation Notes
- Ensure the engine is completely cool and disconnected from any power source before starting.
- Carefully remove the bolts securing the exhaust cover. Note their positions if they are different lengths.
- Remove the old exhaust cover and gasket. You may need to gently pry the cover off if it is stuck.
- Thoroughly clean the mating surfaces on both the engine block and the exhaust cover. All old gasket material and corrosion must be removed for a proper seal.
- Place the new gasket into position. Ensure it is correctly aligned with the bolt holes.
- Reinstall the exhaust cover and tighten the bolts in a crisscross pattern to the manufacturer-specified torque to ensure even pressure.
- Once assembled, start the engine and carefully check for any signs of exhaust leaks around the cover.
Troubleshooting & FAQ
How do I know if this gasket will fit my Yamaha outboard?
This gasket fits specific Yamaha 25HP 2-Stroke engines from 1990-1997. Please review the compatibility table on this page to confirm your exact model and year before purchasing.
What are the signs of a bad exhaust cover gasket?
Signs of a failing gasket include a noticeable exhaust leak (hissing sound or visible fumes) from the cover area, an unusually loud engine noise, reduced engine performance, or water leaking from the exhaust cover.
Do I need sealant with this gasket?
Typically, this type of gasket is designed to be installed dry without any additional sealant. Always refer to your engine's service manual for the most accurate procedure.
Why is this gasket listed as a "Special Order Item"?
A "Special Order Item" designation means this part may have a longer lead time as it is not always available in our primary warehouse. Please account for extra processing days when 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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