Water Pump Impeller – Fits Yamaha 20-25 HP Outboards (Replaces 6L2-44352-00-00)
Water Pump Impeller – Fits Yamaha 20-25 HP Outboards (Replaces 6L2-44352-00-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller – Fits Yamaha 20-25 HP Outboards (Replaces 6L2-...
Product Details
This replacement Water Pump Impeller – Fits Yamaha 20-25 HP Outboards (Replaces 6L2-44352-00-00) is engineered to restore cooling performance in various Yamaha outboard motors. It is designed for Yamaha 2-Stroke engines, including 20 HP (1996–1997) and 25 HP (1988–2019) models, as well as 4-Stroke F25C, T25C (2016–2023), and other 25 HP two-cylinder outboards.
This impeller serves as a direct cross-reference for Sierra 18-3065, Mallory 9-45613, Mercury/Quicksilver 879128, and OEM part 6L2-44352-00-00.
- Installs directly into the factory water pump housing.
- Constructed from durable neoprene rubber with a rigid plastic hub for longevity.
- Features flexible blades that efficiently draw cooling water through the lower unit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 6L2-44352-00-00 | OEM |
| Sierra | 18-3065 | Aftermarket |
| Mallory | 9-45613 | Aftermarket |
| Mercury/Quicksilver | 879128 | Aftermarket |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha outboards, this part fits the following two-cylinder models:
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F20B | 20 | 4-Stroke | 2018–2023 | 6L2-44352-00-00 | Two-cylinder models |
| Yamaha | F25C | 25 | 4-Stroke | 2016–2023 | 6L2-44352-00-00 | Two-cylinder models |
| Yamaha | T25C | 25 | 4-Stroke | 2018–2023 | 6L2-44352-00-00 | Two-cylinder models |
| Yamaha | 20 HP | 20 | 2-Stroke | 1996–1997 | 6L2-44352-00-00 | Two-cylinder models |
| Yamaha | 25 HP | 25 | 2-Stroke | 1988–2019 | 6L2-44352-00-00 | Two-cylinder models |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement in water pump housing
- Material
- Neoprene rubber with plastic/nylon hub
- Number of Blades
- 6
- Overall Diameter
- 52 mm (2.05 in)
- Height
- 19 mm (0.75 in)
- Hub Shaft Diameter
- 13.65 mm (0.54 in)
- Weight
- 20–23 g (0.7–0.8 oz)
- Color
- Black
What’s in the Box
- 1 x Impeller (6L2-44352-00-00)
Installation Notes
Yamaha recommends replacing impellers every 100 hours of operation or once per season as part of preventative maintenance. Professional installation is advised. A general guide is as follows:
- Disconnect the battery and shift the outboard to neutral.
- Remove the lower unit (gearcase) by unbolting it from the engine's midsection.
- Locate and unbolt the water pump housing cover.
- Lift the housing to expose the old impeller. Note the rotational direction of the old blades.
- Remove the old impeller, woodruff key, and any gaskets or wear plates.
- Clean the inside of the housing and inspect it for scoring, warping, or corrosion.
- Install the new wear plate and gasket, followed by the woodruff key on the driveshaft.
- Slide the new impeller onto the driveshaft, aligning its keyway.
- While pushing the housing down, turn the driveshaft clockwise to fold the new impeller blades correctly.
- Secure the housing with its bolts, then reinstall the lower unit assembly.
- Reconnect the battery and test the engine on a water supply to verify cooling system performance.
Troubleshooting & FAQ
How do I know if this impeller fits my Yamaha outboard?
This impeller is designed for specific Yamaha 2-stroke and 4-stroke models, including 20 HP (1996–1997), 25 HP (1988–2019), and certain F25C/T25C models from 2016 onward. Always verify your engine's model and year against the detailed compatibility table on this page before ordering.
What are signs of a failing water pump impeller?
Common signs include a weak or nonexistent water stream from the tell-tale outlet, engine overheating alarms, steam from the exhaust, or a melted water pump housing. Reduced engine performance can also indicate a cooling problem.
How often should I replace my impeller?
For optimal reliability, most marine mechanics and manufacturers like Yamaha recommend replacing the impeller every 100 hours of use or at least once per year (typically during winterization or spring pre-launch service), whichever comes first.
Is a gasket included with this impeller?
This package contains the impeller only. Gaskets, O-rings, and other water pump service components should be sourced separately or purchased as part of a complete water pump repair kit.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and batch-inspected for quality and consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days for most regions. 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 you encounter an issue, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. Please see our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before installation. If anything differs—even if your model appears compatible—do not purchase and contact us for clarification.
- This is an aftermarket replacement part, not an Original Equipment Manufacturer (OEM) component. Brand names and part numbers are used for reference purposes only.
- Professional installation is highly recommended to ensure safety, proper function, and optimal engine performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability and performance.
- Fast Global Fulfillment — With warehouses worldwide, we offer free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we deliver fair pricing without compromising on materials or quality control.
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