Water Pump Impeller – Fits Yamaha 2HP 2-Stroke (Replaces 646-44352-01-00)
Water Pump Impeller – Fits Yamaha 2HP 2-Stroke (Replaces 646-44352-01-00) 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 – Fits Yamaha 2HP 2-Stroke (Replaces 646-44352-...
Water Pump Impeller – Fits Yamaha 2HP 2-Stroke (Replaces 646-44352-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller – Fits Yamaha 2HP 2-Stroke Outboards (Replaces 646-44352-01-00) is designed for Yamaha's smallest 2-stroke portable outboard motors. It fits models rated at 2 horsepower manufactured from 1989 through 2002, including all 2MSH model variants.
This part is a direct replacement for OEM part number 646-44352-01-00 and serves as a cross-reference for Sierra 18-3074, GLM 89880, and Mallory 9-45605.
- Engineered as a direct OEM-equivalent replacement for straightforward installation.
- Constructed from durable, marine-grade neoprene rubber for reliable performance.
- An essential internal component of the water pump assembly responsible for engine cooling.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 646-44352-01-00 |
| Sierra | 18-3074 |
| GLM | 89880 |
| Mallory | 9-45605 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller is compatible with specific Yamaha 2HP 2-stroke outboard models as listed in the official parts catalogs.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 2MSHY | 2 | 2-Stroke | 2000 | 646-44352-01-00 | Part of water pump repair kit 6GD-W0078-00-00 |
| Yamaha | 2MSHZ | 2 | 2-Stroke | 2001 | 646-44352-01-00 | Part of water pump repair kit 6GD-W0078-00-00 |
| Yamaha | 2MSHA | 2 | 2-Stroke | 2002 | 646-44352-01-00 | Part of water pump repair kit 6GD-W0078-00-00 |
| Yamaha | 2MSHP-2MSHX | 2 | 2-Stroke | 1991–1999 | 646-44352-01-00 | Part of water pump repair kit 6GD-W0078-00-00 |
| Yamaha | 2SD-2SF | 2 | 2-Stroke | 1989–1990 | 646-44352-01-00 | Part of water pump repair kit 6A1-W0078-02-00/6GD-W0078-00-00 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM replacement
- Blades
- 6
- Material
- Neoprene rubber
- Color
- Black
- OEM Part Number
- 646-44352-01-00
- Other Technical Attributes
- Internal component of water pump assembly
What’s in the Box
- 1 x Impeller (Replaces 646-44352-01-00)
Installation Notes
- Disconnect the battery and shut off the fuel supply for safety.
- Remove the lower unit (gearcase) from the outboard motor by unbolting it.
- Unbolt and remove the water pump housing to access the old impeller.
- Carefully inspect the housing, gaskets, and wear plate for cracks, grooves, or corrosion. Replace any worn components.
- Clean the interior surfaces of the pump housing.
- Slide the new impeller onto the driveshaft. Apply a light coat of marine grease to the housing interior and align the blades with the direction of engine rotation.
- Reassemble the water pump housing, ensuring a tight seal, and reinstall the lower unit.
- Once assembled, test the engine in water to verify strong and consistent water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller fits my exact engine model?
This impeller is designed for Yamaha 2HP 2-stroke outboards from 1989 to 2002. The best way to ensure a match is to verify your OEM part number is 646-44352-01-00 or one of the listed aftermarket cross-references. You can also consult our compatibility table.
What are the signs of a failing water pump impeller?
Common signs include a weak or intermittent stream from the tell-tale (water indicator), engine overheating alarms, or visible cracks and stiffness in the old impeller's blades upon inspection. Reduced cooling performance is the primary symptom.
How often should I replace my outboard's impeller?
As a preventive maintenance measure, it is recommended to inspect your impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
Is this part identical to the genuine Yamaha impeller?
This is an aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It provides comparable performance and material quality (neoprene rubber) to the original Yamaha part at a better value.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9001 certified facility, with batch inspections for quality and consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, with expedited options available at checkout where applicable.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window_ for unused items in their original condition.
Safety & Important Info
- Verify the images and specifications against your original part before purchasing. If anything differs—even if your model is listed as compatible—do not install.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- 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.
- Fast Global Fulfillment — We offer free standard delivery to most regions with an average transit time of 5–15 days.
- Manufacturer-Direct Value — Our model ensures you get fair pricing without compromising on materials or quality control.
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