Yamaha 4-5HP 2-Stroke Water Pump Kit Housing 6E0-W0078-A3 A4
6E0-W0078-A3 / 6E0-W0078-A4
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Yamaha 4–5HP Water Pump Repair Kit
With housing | Replaces 6E0-W0078-A3 and 6E0-W0078-A4
A complete aftermarket water-pump repair kit with housing for specified Yamaha 4HP and 5HP two-stroke outboards from the 1997-on application range. It groups the main pump housing, impeller, wear components, gasket and listed fasteners needed for a routine cooling-pump overhaul.
Key Features
- Housing kit: Includes the impeller housing and internal insert.
- Wear components included: Impeller, wear plate, gasket and water-seal damper.
- Installation hardware: Four bolts and one long dowel pin are listed.
- Aftermarket replacement: Referenced against Yamaha 6E0-W0078-A3 and A4.
- Service-focused: Suitable for routine water-pump renewal or low cooling-water output diagnosis after other causes are checked.
Technical Specs
| Application | Yamaha 4HP / 5HP two-stroke |
| Catalogued years | 1997 onward |
| Kit type | Water-pump repair kit with housing |
| Impeller quantity | 1 |
| Bolts | 4 |
| 4Boats SKU | 6E0-W0078-A3 / 6E0-W0078-A4 |
Compatibility / Fitment Guide
| Engine | Catalogued range | Required confirmation |
|---|---|---|
| Yamaha 4HP two-stroke | 1997 onward | Parts diagram must specify 6E0-W0078-A3 or A4. |
| Yamaha 5HP two-stroke | 1997 onward | Check full model code, shaft variant and serial range. |
Not confirmed for: pre-1997 4/5HP engines, Yamaha F4/F5 four-strokes, or other horsepower ranges solely because the impeller looks similar.
Listed kit contents: 1 gasket, 1 housing, 1 housing insert, 1 wear plate, 1 water-seal damper, 1 impeller, 4 bolts and 1 long dowel pin.
Part Number Cross Reference
| Yamaha kit reference | 6E0-W0078-A3 |
| Yamaha alternate / later kit reference | 6E0-W0078-A4 |
| Full-format equivalents | 6E0-W0078-A3-00; 6E0-W0078-A4-00 |
| 4Boats SKU | 6E0-W0078-A3 / 6E0-W0078-A4 |
Cross-reference numbers identify the intended application; this listing is an aftermarket replacement unless explicitly stated otherwise.
Frequently Asked Questions
Is this a genuine Yamaha kit?
No. It is an aftermarket repair kit referenced against the Yamaha numbers above.
Does it fit Yamaha F4 or F5 four-strokes?
This listing is specified for 1997-on 4HP and 5HP two-strokes. Do not order for an F-series four-stroke without confirming the exact kit number.
Does the kit include the housing?
Yes. The listed contents include the housing, insert, wear plate, impeller and associated parts shown above.
How often should the impeller be changed?
Follow the service interval and inspection criteria in the manual for your exact engine; operating conditions and dry running can shorten service life.
Turn the engine only as directed during installation, lubricate the impeller with an approved assembly lubricant and confirm a strong tell-tale after service. Never run the water pump dry.
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