Piston Ring Kit – Fits Yamaha 25B/25V/30G/E30 Outboards (Replaces 61N-11603-00)
Piston Ring Kit – Fits Yamaha 25B/25V/30G/E30 Outboards (Replaces 61N-11603-00) 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 is designed for a precise fit on a range of Yamaha 2-stroke outboard engines, specifically 25 HP and 30 HP models (including 25B, 25V, 30G, E30 series) manufactured between 1986 and 2013. It serves as a standard-size replacement to restore compression and performance.
This kit is a direct replacement for Yamaha OEM part number 61N-11603-00.
- Engineered for direct OEM-level replacement.
- Includes a complete ring set for one piston.
- Constructed from durable steel and cast iron for reliable service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 61N-11603-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | 25B, 25BMH, 25BWH | 25 | 2-Stroke | 1986–2013 | 61N-11603-00 |
| Yamaha | E25A, 25VE, 25VM | 25 | 2-Stroke | 1986–2013 | 61N-11603-00 |
| Yamaha | 30H, 30HMH, 30HWC | 30 | 2-Stroke | 1986–2013 | 61N-11603-00 |
| Yamaha | 30G, 30GE | 30 | 2-Stroke | 1986–2013 | 61N-11603-00 |
| Yamaha | E30, E30HMH | 30 | 2-Stroke | 1986–2013 | 61N-11603-00 |
Technical Specs
- Product Type
- Piston Ring Kit (Standard Size)
- Installation
- Direct OEM replacement
- Housing Material
- Steel/Cast Iron
- Product Height
- 8.5
- Product Width
- 8.5
- Product Length
- 10.0
- Package Contains
- Complete ring set for one piston
- OEM Fitment
- Yamaha 2-stroke outboard engines
- Condition
- New
What’s in the Box
- 1 x Piston Ring Kit (61N-11603-00)
Installation Notes
- Disconnect the battery and spark plug wires for safety.
- Remove the cylinder head and piston assembly according to the service manual.
- Carefully remove the old piston rings using a ring expander tool. Avoid scratching the piston.
- Thoroughly clean the piston ring grooves, removing all carbon buildup.
- Install the new rings using the expander, ensuring they are in the correct order and orientation (check for markings).
- Verify the ring end gaps are staggered correctly around the piston before reassembly.
- Lubricate the piston and cylinder before carefully re-installing the assembly.
- Reassemble all components, torquing bolts to manufacturer specifications.
Troubleshooting & FAQ
How do I know if my piston rings are failing?
Common symptoms of worn piston rings include excessive blue or white exhaust smoke, a noticeable loss of engine power, increased oil consumption, and poor results from a compression test.
Is this kit for one or all pistons?
This kit contains a complete set of rings for a single piston. If you are rebuilding an engine with multiple cylinders, you will need to purchase one kit per piston.
Do these rings need to be gapped before installation?
These rings are manufactured to standard OEM specifications. While it's always best practice to check the end gap with a feeler gauge against your engine's service manual, they typically do not require filing or gapping for a standard installation.
What is the proper break-in procedure after installing new rings?
Follow your engine's service manual for specific break-in procedures. Generally, it involves running the engine at varied, moderate RPMs for several hours, avoiding both idle and full throttle for extended periods to allow the rings to seat properly against the cylinder wall.
What’s the difference between this and the original Yamaha part?
Our aftermarket rings are designed to meet or exceed OEM specifications for fit, material, and performance. The primary difference is the price, as we source directly from the manufacturer to offer a more competitive value.
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.
Payment & Security
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