Water Pump Impeller Repair Kit – Fits Yamaha 9.9–25HP Outboards (Replaces 61N-W0078-01-00)
Water Pump Impeller Repair Kit – Fits Yamaha 9.9–25HP Outboards (Replaces 61N-W0078-01-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller Repair Kit – Fits Yamaha 9.9–25HP Outboards (Re...
Water Pump Impeller Repair Kit – Fits Yamaha 9.9–25HP Outboards (Replaces 61N-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit – Fits Yamaha 9.9–25HP Outboards is a comprehensive solution for maintaining your engine’s cooling system. It is designed for Yamaha 2-Stroke 25B, 25X, 30H, and 30G motors (2000–2018), 4-Stroke F25A and F25D engines (1998–2017), and various FT8 and FT9.9 high thrust models from 2001 onward. The kit includes all necessary components for a full water pump service.
This assembly is a direct replacement for Yamaha OEM part numbers 61N-W0078-01-00, 61N-W0078-10-00, 61N-W0078-11-00, 69P-W0078-00, and Sierra 18-3432, ensuring broad interchange compatibility.
- Installs in the lower unit of the outboard motor.
- Features a durable neoprene impeller for reliable water flow.
- Produced in an ISO9002 certified facility for guaranteed quality control.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 61N-W0078-01-00 |
| Yamaha | 61N-W0078-10-00 |
| Yamaha | 61N-W0078-11-00 |
| Yamaha | 61N-W0078-11-00-00 |
| Yamaha | 61N-W0078-13-00 |
| Yamaha | 61N-W0078-14-00 |
| Yamaha | 69P-W0078-00 |
| Yamaha | 69P-W0078-01 |
| Yamaha | 69P-W0078-02 |
| Sierra | 18-3432 |
| Aftermarket | HJ YHJB-61N |
| Aftermarket | AMKITFT8D |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, this kit covers an extensive range of 2-stroke and 4-stroke portable and high-thrust models. Please verify your specific model and year against the list to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 25B (25BMHL) | 25 | 2-Stroke | 2001–2018 | 61N-W0078 | |
| Yamaha | 25B (25BMHS) | 25 | 2-Stroke | 2001–2007 | 61N-W0078 | |
| Yamaha | 25X (25XMHS) | 25 | 2-Stroke | 2001–2018 | 61N-W0078 | |
| Yamaha | 30H (30HMHL, 30HMHS) | 30 | 2-Stroke | 2001–2018 | 61N-W0078 | |
| Yamaha | 30H (30HWHL) | 30 | 2-Stroke | 2016–2018 | 61N-W0078 | |
| Yamaha | 30H (30HWL) | 30 | 2-Stroke | 2002–2018 | 61N-W0078 | |
| Yamaha | 30G (30GMH) | 30 | 2-Stroke | 2000–2001 | 61N-W0078 | |
| Yamaha | C30ELRR | 30 | 2-Stroke | 1993 | 61N-W0078 | |
| Yamaha | C30ELRS | 30 | 2-Stroke | 1994 | 61N-W0078 | |
| Yamaha | C30MLHS | 30 | 2-Stroke | 1994 | 61N-W0078 | |
| Yamaha | C30ELRT | 30 | 2-Stroke | 1995 | 61N-W0078 | |
| Yamaha | F25A | 25 | 4-Stroke | 1998 | 61N-W0078 | |
| Yamaha | F25AEH | 25 | 4-Stroke | 2000 | 61N-W0078 | |
| Yamaha | F25AEHTL | 25 | 4-Stroke | 2000–2009 | 61N-W0078 | |
| Yamaha | F25AET | 25 | 4-Stroke | 2000 | 61N-W0078 | |
| Yamaha | F25AETL | 25 | 4-Stroke | 2001–2009 | 61N-W0078 | |
| Yamaha | F25AMH | 25 | 4-Stroke | 2000 | 61N-W0078 | |
| Yamaha | F25AMHL | 25 | 4-Stroke | 2001–2009 | 61N-W0078 | |
| Yamaha | F25AMHS | 25 | 4-Stroke | 2001–2002 | 61N-W0078 | |
| Yamaha | F25D (F25DEHTL) | 25 | 4-Stroke | 2009–2017 | 61N-W0078 | |
| Yamaha | F25D (F25DETL) | 25 | 4-Stroke | 2009–2017 | 61N-W0078 | |
| Yamaha | F25D (F25DMHL) | 25 | 4-Stroke | 2009–2017 | 61N-W0078 | |
| Yamaha | FT8D / FT8G | 8 | 4-Stroke | 2001–2014 | 61N-W0078 | High Thrust |
| Yamaha | FT9.9G | 9.9 | 4-Stroke | 2008–2012 | 61N-W0078 | High Thrust |
| Yamaha | FT9.9J | 9.9 | 4-Stroke | 2013+ | 61N-W0078 | High Thrust |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Lower Unit
- Housing Material
- Plastic (Nylon PA66), Stainless Steel 316 (Cup and Wear Plate)
- Impeller Material
- Neoprene
- Housing Color
- Black
- Other Technical Attributes
- ISO9002 certified factory production
What’s in the Box
- 1 x Water Pump Housing (61N-44311-01-00)
- 1 x Cartridge Insert (61N-44322-00-00)
- 1 x Impeller (6H4-44352-02-00)
- 1 x Water Seal Damper (61N-44323-00-00)
- 1 x Cartridge Outer Plate (6L2-44367-00-00)
- 4 x Plain Washer (92990-06600-00)
- 1 x Woodruff Key (90280-03024-00)
- 1 x O-Ring (93210-45161-00)
- 4 x Bolt (97095-06040-00)
Installation Notes
- Disconnect the battery and spark plug wires for safety.
- Place a drain pan under the lower unit and remove the gearcase oil drain screw to empty the oil.
- Unbolt and carefully lower the gearcase assembly from the midsection.
- Remove the bolts securing the water pump housing to the gearcase.
- Slide the old housing, impeller, and wear plate off the driveshaft. Clean the driveshaft and surrounding area.
- Install the new Woodruff key, gaskets, wear plate, and impeller. Always turn the driveshaft clockwise when pushing the impeller into the housing.
- Install the new housing, seals, and bolts. Torque bolts to manufacturer specifications.
- Apply a light coat of marine grease to the driveshaft splines and reinstall the gearcase.
- Refill the lower unit with fresh gear oil before starting the engine.
- Reconnect the battery and start the engine with a reliable water supply, confirming water is exiting the tell-tale port.
Troubleshooting & FAQ
How do I know if this kit fits my Yamaha outboard?
The best way to confirm fitment is to check your engine's model number and year against the compatibility table provided. This kit fits a wide range of Yamaha 9.9HP to 30HP models, but verifying your specific model is crucial. If in doubt, compare the parts in the photos to your existing water pump components.
What are the signs of a failing water pump impeller?
Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable decrease in engine performance. A worn or damaged impeller cannot provide sufficient cooling water to the engine.
How often should I replace the water pump impeller?
For preventative maintenance, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions. Operation in saltwater or sandy/silty water may require more frequent replacement.
Does this kit fit F25C models?
No, this kit is not specified for F25C models. While some sources suggest potential compatibility, our data explicitly lists fitment for F25A and F25D models. Please do not purchase this kit for an F25C engine.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. The kit is manufactured in an ISO 9002 facility and batch-inspected for consistency and quality.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available for your location.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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 quality control.
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