Water Pump Impeller for Yamaha 2HP 2-Stroke Outboards – Replaces 646-44352-01-00
Water Pump Impeller for Yamaha 2HP 2-Stroke Outboards – 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 for Yamaha 2HP 2-Stroke Outboards – Replaces 64...
Water Pump Impeller for Yamaha 2HP 2-Stroke Outboards – Replaces 646-44352-01-00 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller is an aftermarket replacement for selected Yamaha 2HP 2-Stroke outboards. It replaces Yamaha OEM part number 646-44352-01-00 and is identified in Yamaha parts catalogs as an impeller used in the lower-drive water pump assembly.
Catalog evidence identifies this impeller for Yamaha 2HP 2-Stroke models including the 2SK, 2SN, 2SH, and 2SJ in the documented 1984–1987 applications. Always match the complete engine model and year before ordering.
- Aftermarket water pump impeller for selected Yamaha 2HP 2-Stroke outboards.
- Replacement for Yamaha OEM reference 646-44352-01-00.
- Designed for installation in the lower-drive water pump assembly.
- Impeller only; the drive key and other water-pump service parts are not included unless specifically stated below.
Part Number Matrix
Use the verified OEM reference below together with your engine model and year to confirm compatibility.
| Brand | Part Number |
|---|---|
| Yamaha | 646-44352-01-00 |
Engine & Model Compatibility
Compatibility must be confirmed by matching the engine brand, horsepower, stroke, model, and year. The catalog applications below document the impeller in Yamaha 2HP 2-Stroke lower-drive diagrams.
| Brand | Model | Rated HP | Stroke | Years Documented | OEM Part No. | Catalog Application |
|---|---|---|---|---|---|---|
| Yamaha | 2SK | 2 | 2-Stroke | 1984–1985 | 646-44352-01-00 | Lower Drive |
| Yamaha | 2SN | 2 | 2-Stroke | 1984–1985 | 646-44352-01-00 | Lower Drive |
| Yamaha | 2SH | 2 | 2-Stroke | 1986–1987 | 646-44352-01-00 | Lower Drive and Repair Kit diagrams |
| Yamaha | 2SJ | 2 | 2-Stroke | 1986 | 646-44352-01-00 | Lower Drive and Repair Kit diagrams |
Important: The documented applications above do not establish fitment for every Yamaha 2HP model or every production year. Do not rely on horsepower alone; compare the OEM number and the exact model designation on your engine.
Technical Specs
- Product Type
- Water Pump Impeller
- Application
- Selected Yamaha 2HP 2-Stroke outboards
- Installation Location
- Lower-drive water pump assembly
- Replacement OEM Reference
- 646-44352-01-00
- Impeller Style
- High-pressure, short-vane impeller design
- Material
- Flexible marine-grade impeller rubber
What’s in the Box
- 1 x Water pump impeller
The drive key, gaskets, housing, wear plate, cup, seals, and other water-pump components are not included.
Installation Notes
- Disconnect the spark plug wire and battery cables, if equipped, before servicing the outboard.
- Place the outboard in neutral and remove the fasteners securing the lower unit.
- Lower the gearcase carefully and disconnect the shift linkage or other connections as required by the engine service procedure.
- Locate the water-pump housing on top of the gearcase and remove the housing fasteners.
- Remove the housing and inspect the old impeller, drive key, gaskets, wear plate, cup, and housing for damage or wear.
- Remove the old impeller and clean the mating surfaces. Replace the drive key or gaskets if worn or damaged.
- Install the new impeller over the drive key. Rotate the driveshaft in the correct direction while seating the impeller blades in the housing.
- Reinstall the water-pump housing and secure it according to the engine manufacturer’s service procedure.
- Reattach the lower unit, ensuring that the driveshaft, shift mechanism, and water tube are correctly aligned.
- Test the engine in a suitable test tank or with an appropriate flushing device. Confirm a strong cooling-water discharge before normal operation.
Troubleshooting & FAQ
How can I tell if this impeller will fit my engine?
Match your engine’s brand, horsepower, 2-Stroke designation, exact model, year, and OEM part number to the compatibility information above. The OEM reference is 646-44352-01-00. If any of these details differ, confirm fitment before ordering.
What are the signs of a failing water pump impeller?
Common symptoms include overheating, reduced cooling-water flow, little or no tell-tale discharge, and a dry, cracked, distorted, or missing impeller when inspected.
Is the drive key included?
No. This listing includes one impeller only. The drive key and other water-pump service parts must be reused if serviceable or purchased separately.
How often should I replace my impeller?
Replacement intervals depend on operating hours, storage conditions, water quality, and the manufacturer’s service recommendations. Replace the impeller whenever it shows cracking, hardening, deformation, vane damage, or reduced cooling-water flow.
Is this an OEM part?
No. This is an aftermarket replacement impeller intended to replace the specified Yamaha OEM reference. Yamaha is a trademark of its respective owner and is used only to identify application compatibility.
Is this a complete water-pump repair kit?
No. This listing is for one impeller only. It does not include the key, gaskets, seals, cup, wear plate, housing, or other repair-kit components.
Shipping speed & cost
We ship worldwide quickly—typical transit is 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. Returns are accepted within the standard return window when unused and in original condition. Contact support with your order details for assistance.
Safety & Important Info
- Confirm the exact engine model, year, stroke, and OEM reference before purchase.
- Do not operate an outboard without an adequate water supply for cooling.
- Inspect the water-pump housing, drive key, gaskets, wear plate, cup, and seals during impeller replacement.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended if you are not experienced with lower-unit or water-pump service.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered for dependable service in 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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