Water Pump Repair Kit – Fits Yamaha 150-300HP Outboard Motors (Replaces 61A-W0078-A3-00, 61A-W0078-A4-00)
Water Pump Repair Kit – Fits Yamaha 150-300HP Outboard Motors (Replaces 61A-W0078-A3-00, 61A-W0078-A4-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit – Fits Yamaha 150-300HP Outboard Motors (Repl...
Water Pump Repair Kit – Fits Yamaha 150-300HP Outboard Motors (Replaces 61A-W0078-A3-00, 61A-W0078-A4-00) is backordered and will ship as soon as it is back in stock.
Product Details
This comprehensive Water Pump Repair Kit – Fits Yamaha 150-300HP Outboard Motors provides all the essential components for servicing the cooling system on Yamaha outboard engines. It is designed for a broad range of Yamaha 2-stroke and 4-stroke V6 models from 150HP to 300HP manufactured between 1992 and 2023, including the popular F-series and VMAX families.
The kit serves as a direct interchange for Yamaha OEM part numbers 61A-W0078-A2-00, 61A-W0078-A3-00, and 61A-W0078-A4-00, as well as Sierra 18-3396-1 and Mallory 9-48618.
- Installs in the lower unit/gearcase to restore cooling performance.
- Includes the impeller, housing, gaskets, O-rings, and all hardware for a complete rebuild.
- Features a durable housing constructed from high-quality Nylon PA66 plastic.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 61A-W0078-A2-00 | 61A-W0078-A4-00 | |
| Yamaha | 61A-W0078-A3-00 | 61A-W0078-A4-00 | |
| Yamaha | 61A-W0078-A4-00 | Current OEM Number | |
| Sierra | 18-3396-1 | Aftermarket Interchange | |
| Mallory | 9-48618 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for a wide range of Yamaha 2-stroke and 4-stroke V6 outboards from 150 to 300 horsepower.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F150, LF150 | 150 | 4-Stroke | All Models | 61A-W0078-A3-00 | |
| Yamaha | F175LA, F175XA | 175 | 4-Stroke | 2014–2016 | 61A-W0078-A3-00 | |
| Yamaha | F200, LF200 | 200 | 4-Stroke | 2002–2016 | 61A-W0078-A3-00 | Multiple variants including F200LB, F200TXR, F200XA, F200XB, F200XCA |
| Yamaha | F225, LF225 | 225 | 4-Stroke | 2002–2016 | 61A-W0078-A3-00 | Multiple variants including F225TUR, F225TXR, F225XA |
| Yamaha | F250, LF250 | 250 | 4-Stroke | 2004–2005 | 61A-W0078-A3-00 | Variants include F250TUR, F250TXR |
| Yamaha | VF175LA | 175 | 4-Stroke | 2015–2018 | 61A-W0078-A3-00 | VMAX SHO models |
| Yamaha | 150HP 2-Stroke | 150 | 2-Stroke | 1992–2006 | 61A-W0078-A3-00 | Including C150, P150, PX150, S150, SX150, V150, VX150, VZ150, Z150 variants |
| Yamaha | 175HP 2-Stroke | 175 | 2-Stroke | 1997–2000 | 61A-W0078-A3-00 | Including 175TLRY, 175TXRY, S175TXR variants |
| Yamaha | 200HP 2-Stroke | 200 | 2-Stroke | 1997–2005 | 61A-W0078-A3-00 | Including 200TLR, L200TXR, LX200TXR, S200TXR, SX200TXR, VX200TLR, VZ200TLR, Z200TLR, Z200TXR variants |
| Yamaha | 225HP 2-Stroke | 225 | 2-Stroke | 1997–2005 | 61A-W0078-A3-00 | Including 225TLR, LX225TXR, SX225TUR, SX225TXR, VX225TLR variants |
| Yamaha | 250HP 2-Stroke | 250 | 2-Stroke | 1992–2005 | 61A-W0078-A3-00 | Including LX250TUR, LX250TXR, S250, SX250, SX250TUR, SX250TXR, V250, VX250TLR, VZ250TLR variants |
| Yamaha | 300HP 2-Stroke | 300 | 2-Stroke | 2003–2005 | 61A-W0078-A3-00 | Z300 models including Z300TUR, Z300TXR, LZ300TUR, LZ300TXR variants |
| Yamaha | F150C | 150 | 4-Stroke | 2017–2023 | 61A-W0078-A3-00 | Newer F150 variants |
Technical Specs
- Product Type
- Water Pump Repair Kit with Housing
- Installation
- Lower Unit/Gearcase
- Housing Material
- Plastic (Nylon PA66)
- Housing Color
- Black
- Warranty
- Manufacturer standard warranty
- Other Technical Attributes
- Includes hardware and all components for complete water pump rebuild
What’s in the Box
- 1 x Cartridge Insert (61A-44322-02-00)
- 1 x O-Ring (93210-86M38-00)
- 1 x O-Ring (93210-37M67-00)
- 1 x Impeller (6E5-44352-01-00)
- 1 x Cartridge Outer Plate (6G5-44323-01-00)
- 1 x Water Pump Gasket (6E5-44315-A0-00)
- 2 x Dowel Pins (93606-12019-00)
- 4 x Bolts with Washer (90119-08M14-00)
- 1 x Woodruff Key (90280-04M05-00)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Drain the gearcase lubricant into a suitable container.
- Remove the bolts securing the lower unit (gearcase) and carefully lower it from the midsection.
- Unbolt and remove the old water pump housing from the driveshaft.
- Thoroughly clean the mating surfaces of the driveshaft and lower unit.
- Install the new gaskets, impeller, and housing components from the kit in the correct order.
- Ensure the Woodruff key is correctly seated on the driveshaft before sliding the new impeller on.
- Secure the new water pump housing, torquing the bolts to the manufacturer's specifications.
- Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are properly aligned.
- Refill the gearcase with fresh marine gear lubricant.
- Reconnect the battery and test the engine in the water to confirm strong water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
This kit is designed for a very wide range of Yamaha 150HP to 300HP V6 outboards from 1992-2023. The best way to confirm fitment is to check your engine's model and year against the detailed compatibility table provided on this page.
What are the signs of a failing water pump?
Common signs include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "tell-tale" outlet, or finding a dry, brittle, or cracked impeller during a routine inspection.
How often should I replace my water pump service kit?
As a crucial part of preventative maintenance, it is recommended to replace the impeller and gaskets at least every 1-2 years or every 100-200 operating hours. Service intervals should be shorter if you frequently operate in saltwater, silt, or sandy conditions.
Is the pump housing included with this kit?
Yes, this is a complete repair kit. It includes the main plastic housing, cartridge insert, outer plate, impeller, gaskets, O-rings, and all necessary bolts and pins for a full replacement.
My part number is 61A-W0078-A3-00. Is this the right replacement?
Yes. This kit is a direct aftermarket replacement for Yamaha parts 61A-W0078-A2-00, 61A-W0078-A3-00, and the latest iteration, 61A-W0078-A4-00.
Is it difficult to install this kit myself?
The installation requires removing the lower unit, which can be heavy and requires mechanical aptitude. While it can be a DIY job for experienced individuals with the right tools, we recommend professional installation to ensure safety and proper function.
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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