Piston Ring Kit – Fits Yamaha 25Q/QEO & 40V/VMH Series Outboards (Replaces 63D-11605-00)
Piston Ring Kit – Fits Yamaha 25Q/QEO & 40V/VMH Series Outboards (Replaces 63D-11605-00) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Piston Ring Kit – Fits Yamaha 25Q/QEO & 40V/VMH Series Outboard...
Product Details
This Piston Ring Kit – Fits Yamaha 25Q/QEO & 40V/VMH Series Outboards (Replaces 63D-11605-00) is designed for specific Yamaha 2-stroke outboards, including models in the 25HP series (1990–1994) and various 40HP V-series engines.
It provides a direct replacement for original Yamaha part number 63D-11605-00.
- Standard OEM replacement piston ring kit.
- Installation is specific to your engine model.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 63D-11605-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | 25Q | 25 | 2-Stroke | 1990 | 63D-11605-00 |
| Yamaha | 25QEO | 25 | 2-Stroke | 1991–1994 | 63D-11605-00 |
| Yamaha | 40V | 40 | 2-Stroke | 63D-11605-00 | |
| Yamaha | 40VMH | 40 | 2-Stroke | 63D-11605-00 | |
| Yamaha | 40VETO | 40 | 2-Stroke | 63D-11605-00 | |
| Yamaha | 40VE | 40 | 2-Stroke | 63D-11605-00 | |
| Yamaha | 40VEO | 40 | 2-Stroke | 63D-11605-00 | |
| Yamaha | 40TLR | 40 | 2-Stroke | 63D-11605-00 | |
| Yamaha | 40MLH | 40 | 2-Stroke | 63D-11605-00 | |
| Yamaha | 40VMHO | 40 | 2-Stroke | 63D-11605-00 |
Technical Specs
- Product Type
- Piston Ring Kit
- Installation
- Engine specific
- Dimensions
- Height: 2.0cm; Width: 13.0cm; Length: 13.0cm;
- Warranty
- 1 Year
What’s in the Box
- Piston Ring Kit (Replaces 63D-11605-00)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Drain the engine oil and coolant.
- Remove the cylinder head and any other components blocking access to the piston.
- Carefully extract the piston and connecting rod assembly from the cylinder.
- Using a piston ring expander tool, remove the old rings from the piston.
- Thoroughly clean the piston's ring grooves, removing all carbon buildup.
- Using the ring expander, install the new rings in the correct order and orientation as per the service manual.
- Lubricate the new rings and piston with fresh engine oil.
- Use a piston ring compressor to carefully guide the piston assembly back into the cylinder bore.
- Reassemble the engine, torque all bolts to manufacturer specifications, refill fluids, and check for leaks.
Troubleshooting & FAQ
How do I know if my piston rings need replacing?
Common signs include loss of compression, increased oil consumption, excessive blue or white smoke from the exhaust, and a noticeable decrease in engine power. A cylinder compression test can help confirm their condition.
Is this kit compatible with all Yamaha 40HP models?
No. This kit is specifically for the 2-stroke 40V series models listed in the compatibility table, such as the 40VMH and 40VETO. It is not for 4-stroke or other 40HP series. Always verify your full model number.
What is the correct orientation for installing the rings?
Piston rings often have markings (like a dot or letter) that must face upwards toward the top of the piston. Installing them upside down can cause improper sealing and engine damage. Always consult your engine’s service manual for definitive instructions.
Do I need special tools for this installation?
Yes, a piston ring expander is crucial to avoid bending or breaking the rings during installation. A piston ring compressor is also required to safely re-insert the piston into the cylinder bore without damaging the rings.
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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