Water Pump Impeller – Fits Honda 75–150 HP Outboards (Replaces 19210-ZW1-B04)
Water Pump Impeller – Fits Honda 75–150 HP Outboards (Replaces 19210-ZW1-B04) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller – Fits Honda 75–150 HP Outboards (Replaces 1921...
Water Pump Impeller – Fits Honda 75–150 HP Outboards (Replaces 19210-ZW1-B04) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Water Pump Impeller fits Honda 75–150 HP Outboards, specifically designed for BF75, BF90, BF115, BF130, BF135, and BF150 4-stroke models from 1999 through 2006 and newer. It serves as a direct-fit component to restore your engine's cooling system performance.
It provides a direct replacement and interchange for Honda parts 19210-ZW1-B02, 19210-ZW1-B03, and 19210-ZW1-B04, as well as Sierra 18-3250, Mallory 9-45104, and Mercury 43026Q02.
- Engineered for direct replacement installation.
- Constructed from a durable blend of neoprene and hardened nylon.
- Features a 6-blade design to ensure optimal water flow.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Honda | 19210-ZW1-B04 | Primary OEM replacement |
| Honda | 19210-ZW1-B02 | Superseded by 19210-ZW1-B04 |
| Honda | 19210-ZW1-B03 | Superseded by 19210-ZW1-B04 |
| Sierra | 18-3250 | Aftermarket cross-reference |
| Mallory | 9-45104 | Aftermarket cross-reference |
| Mercury | 43026Q02 | Aftermarket cross-reference |
| EOONI | 19210-ZW1-B04 | Aftermarket cross-reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Honda Outboards: Please verify your model designation (e.g., BF75AX) and year range. This impeller covers a wide range of Honda 4-stroke engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Honda | BF75AX/AY/A1/A2/A3/A4/A5/A6 | 75 | 4-Stroke | 1999–2006 | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
| Honda | BF75D | 75 | 4-Stroke | All years | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
| Honda | BF90AX/AY/A1/A2/A3/A4/A5/A6 | 90 | 4-Stroke | 1999–2006 | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
| Honda | BF90D | 90 | 4-Stroke | All years | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
| Honda | BF115A/BF115D | 115 | 4-Stroke | All years | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
| Honda | BF130A | 130 | 4-Stroke | All years | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
| Honda | BF135A | 135 | 4-Stroke | All years | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
| Honda | BF150A | 150 | 4-Stroke | All years | 19210-ZW1-B04 | Supersedes 19210-ZW1-B02, 19210-ZW1-B03 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement
- Housing Material
- Neoprene and hardened nylon
- Dimensions
- Height: 31.7 mm (1.25 in), Overall diameter: 87.8 mm (3.46 in), Hub shaft diameter: 23.4 mm (0.92 in)
- Weight
- 59.5 g (2.1 oz)
- Number of Blades
- 6
- Warranty
- Varies by manufacturer (Sierra offers limited lifetime)
What’s in the Box
- 1 x Water Pump Impeller (Replaces 19210-ZW1-B04)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Remove the lower unit (gearcase) by unbolting it from the engine housing.
- Locate and remove the water pump housing cover, noting the position of all bolts and seals.
- Carefully remove the old impeller, paying attention to the drive key and the direction of the old blades.
- Clean the housing interior and inspect it for wear, scoring, or corrosion.
- Install the new impeller, using a twisting motion in the direction of engine rotation to bend the blades correctly. Ensure the drive key is properly seated.
- Re-install the water pump housing and gasket, tightening bolts to the manufacturer's recommended torque.
- Re-attach the lower unit to the outboard and reconnect the battery.
- Start the engine using a water supply (flushing muffs) and confirm a steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller fits my Honda engine?
First, verify your engine's model, horsepower, and year by checking the ID plate on the mounting bracket. Then, compare this information against our Engine & Model Compatibility table. This part is a direct replacement for Honda OEM part number 19210-ZW1-B04.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or discovery of brittle, cracked, or melted blades during a physical inspection.
How often should I replace the impeller?
For preventative maintenance, it is recommended to replace the impeller every 1 to 2 years or every 100-200 hours of operation, whichever comes first. Frequency should be increased if operating in sandy, silty, or saltwater environments.
What is the difference between this part and older Honda versions (...B02, ...B03)?
This part, corresponding to OEM 19210-ZW1-B04, is the latest superseded version from Honda. It is fully backward-compatible with 19210-ZW1-B02 and 19210-ZW1-B03 and reflects the most current material and design specifications.
Does this kit include the housing, gaskets, or a keyway?
This listing is for the impeller only. It does not include the water pump housing, wear plate, gaskets, or drive key. Please see "What's in the Box" for a complete list of included items.
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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