Piston Ring Kit – Fits Yamaha 25/40HP 2-Stroke (Replaces 63D-11605-00)
Piston Ring Kit – Fits Yamaha 25/40HP 2-Stroke (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).
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 Piston Ring Kit – Fits Yamaha 25/40HP 2-Stroke (Replaces 63D-11605-00) is designed as a direct replacement for specific Yamaha 2-stroke outboard engines, including 25Q/QEO models from 1990–1994 and various 40HP models such as the 40V, VMH, and VETO series. It serves as a 2nd oversize ring set for bored cylinders.
This kit provides a direct interchange for Yamaha part number 63D-11605-00, which supersedes older parts 63D-11601-20-00 and 63D-11610-20-00.
- Product Type: Piston Ring Kit, 2nd Oversize
- Installation: Engine-specific; professional installation is recommended
- Contents: Includes one OEM specification replacement ring set
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 63D-11605-00 | Supersedes 63D-11601-20-00, 63D-11610-20-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Designed for specific Yamaha 2-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 25Q/QEO | 25 | 2-Stroke | 1990–1994 | 63D-11605-00 | Supersedes 63D-11601-20-00, 63D-11610-20-00 |
| Yamaha | 40V/VMH | 40 | 2-Stroke | 63D-11605-00 | ||
| Yamaha | VETO/VMH | 40 | 2-Stroke | 63D-11605-00 |
Technical Specs
- Product Type
- Piston Ring Kit, 2nd Oversize
- Installation
- Engine-specific
- Fuel Type
- Gasoline (Petrol)
- Dimensions
- 7.5" L x 7.5" W x 1.0" H
- Other Technical Attributes
- OEM specification replacement ring set
What’s in the Box
- [1] x Piston Ring Set 2nd (63D-11605-00)
Installation Notes
- Disconnect the battery and ensure the engine has completely cooled before beginning work.
- Remove the cylinder head and necessary components to gain access to the piston assembly.
- Carefully remove the old piston rings using a dedicated ring expander tool to prevent piston damage.
- Thoroughly clean the piston ring grooves, removing all carbon deposits and oil residue.
- Install the new piston rings in the correct sequence and orientation as specified in your engine's service manual.
- Generously lubricate the pistons, rings, and cylinder walls with fresh engine oil before reassembly.
- Reassemble all engine components in reverse order of removal, ensuring all bolts are torqued to the manufacturer's precise specifications.
Troubleshooting & FAQ
How do I confirm this is the correct size for my engine?
This is a 2nd oversize (+0.50mm) ring set. It is only compatible with cylinders that have been bored to match this specific oversize dimension. It will not fit a standard or 1st oversize bore. Always measure your cylinder bore before purchasing.
What are the signs of failing piston rings?
Common symptoms include excessive blue or grey smoke from the exhaust, a noticeable increase in oil consumption, loss of engine power and acceleration, and poor results from a compression test.
Is this a complete set for one piston?
Yes, this kit includes a complete set of rings required for one piston assembly in the specified Yamaha models.
Will this fit 4-stroke Yamaha models?
No, this piston ring set is engineered exclusively for the 2-stroke Yamaha outboard models listed in the compatibility table and will not work with any 4-stroke engines.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9001 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.
Payment & Security
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