Water Pump Repair Kit – Fits Yamaha F25 4-Stroke & C30 2-Stroke (Replaces 61N-W0078-11-00)
Water Pump Repair Kit – Fits Yamaha F25 4-Stroke & C30 2-Stroke (Replaces 61N-W0078-11-00) 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 Water Pump Repair Kit provides all the necessary components to service the cooling system on Yamaha F25 4-Stroke models (25 HP, 1998–2018) and C30 2-Stroke models (30 HP, 1993–1997). It’s engineered to restore cooling efficiency and prevent engine overheating.
This kit is a direct replacement for Yamaha part numbers 61N-W0078-11-00 and 61N-W0078-14-00, and it interchanges with Sierra 18-3432.
- Engineered for direct OEM replacement, ensuring proper fit and function.
- Designed for use in outboard engine cooling systems.
- Includes a new impeller, housing insert, plates, and all required seals and hardware.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Yamaha | 61N-W0078-11-00 | 61N-W0078-14-00 |
| Yamaha | 61N-W0078-14-00 | |
| Sierra | 18-3432 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for specific Yamaha F-series 4-stroke and C-series 2-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F25 | 25 | 4-Stroke | 1998–2005 | 61N-W0078-11-00 | Superseded by 61N-W0078-14-00 |
| Yamaha | F25A | 25 | 4-Stroke | 2009–2019 | 61N-W0078-11-00 | Superseded by 61N-W0078-14-00 |
| Yamaha | F25B | 25 | 4-Stroke | 2012–2018 | 61N-W0078-11-00 | Superseded by 61N-W0078-14-00 |
| Yamaha | C30 | 30 | 2-Stroke | 1993–1997 | 61N-W0078-11-00 | Superseded by 61N-W0078-14-00 |
Note: Does not apply to F25C models.
Technical Specs
- Product Type
- Water Pump Repair Kit
- Installation
- Direct OEM replacement
- Application
- For outboard cooling system
- Dimensions
- 10.0" L x 10.0" W x 6.5" H
What’s in the Box
- 1 x Cartridge Insert (63V-44322-00-00)
- 1 x Water Seal Damper 3 (6L2-44367-00-00)
- 1 x Impeller (63V-44352-01-00)
- 1 x Woodruff Key (664-44338-00-00)
- 1 x O-Ring (93210-49046-00)
- 1 x Cartridge Outer Plate (68T-44323-00-00)
- 2 x Dowel Pins (93604-10M03-00)
- 4 x Bolts (97095-08045-00)
- 2 x Plates (63V-44328-01-00)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Remove the lower unit gearcase from the outboard's midsection.
- Unbolt and detach the water pump housing to access the impeller.
- Remove the old impeller, key, gaskets, and wear plates, noting their orientation.
- Thoroughly clean all mating surfaces, removing any corrosion or old gasket material.
- Install the new gaskets, plates, and seals from the kit.
- Slide the new Woodruff key into the driveshaft slot and install the new impeller, turning the shaft clockwise to seat the vanes.
- Lubricate the impeller and housing interior with marine-safe grease.
- Reinstall the pump housing and tighten the bolts to the manufacturer's specified torque.
- Reattach the lower unit to the engine, ensuring the driveshaft and water tube align.
- Reconnect the battery and test the engine with a proper water supply to verify cooling system operation.
Troubleshooting & FAQ
How do I know if my water pump is failing?
Common signs include a weak or no water stream from the "telltale" outlet, engine overheating alarms, or a visibly worn, cracked, or brittle impeller upon inspection.
What is the recommended replacement interval for a water pump impeller?
For optimal performance and to prevent overheating, most manufacturers recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of use, whichever comes first.
Does this kit fit the Yamaha F25C model?
No, this kit is specifically for F25, F25A, and F25B models (1998–2018) and C30 models (1993–1997). It is not compatible with F25C models.
Is the Woodruff key necessary for installation?
Yes, the Woodruff key (664-44338-00-00) is critical. It locks the impeller to the driveshaft, allowing it to spin and pump water. The kit includes the correct key.
Do I need to apply any sealant to the gaskets?
Generally, new gaskets are designed to seal without additional sealant. However, a thin layer of marine-grade gasket sealing compound can be applied to assist with placement and ensure a perfect seal, especially on older or slightly pitted surfaces.
What are the torque specifications for the water pump bolts?
Torque specifications can vary. Always refer to the official service manual for your specific engine model to ensure the bolts are tightened correctly and avoid damaging the housing.
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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