# 6L2-W0078-00 Yamaha Water Pump Repair Kit | Genuine OEM Yamaha Outboard Part

🔧 Product Description

  

Genuine Yamaha Water Pump Repair Kit - Part Number: 6L2-W0078-00

  

A genuine Yamaha water-pump service kit for selected 20HP and 25HP two-stroke outboards.

  

The kit contains the impeller, cartridge insert, outer plate, O-ring, woodruff key and pump fasteners required to renew the principal working components of the lower-unit cooling-water pump.

  

⚙️ Key Features

  

• Genuine Yamaha OEM water-pump repair kit

• Correct Yamaha part number 6L2-W0078-00

• Includes impeller, wear components, seal and hardware

• Designed for Yamaha 20D and 25N lower units

• Sierra and HJ Marine replacement kits available

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 6L2-W0078-00 current OEM water-pump repair-kit reference

  

OEM / Related Numbers:

  

• 6L2-W0078-00

• 6L2-W0078-00-00

• 6L2-44323-00 outer plate

• 93210-45161 O-ring

• 6L2-44352-00 impeller

• 6L2-44322-00 cartridge insert

• 97095-06040 housing bolts

• 90280-03024 woodruff key

• 6L2-44311-01 related housing

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-3431 water-pump kit without housing

• Sierra: 18-4527 water-pump kit with housing

• HJ Marine: YHJB-6L2

• HJ Marine: YHJB-6L2WH with housing

• Aftermarket Yamaha 6L2 complete pump kit

  

🚤 Compatibility

  

Commonly used on:

  

• Yamaha 20HP and 25HP lower-unit water-pump servicing

• Cooling-system maintenance where the housing remains reusable

  

Typically suits:

  

• Engine models:

• Yamaha 20D two-stroke - approximately 1988-2011 / 2016 by market

• Yamaha 20DMH two-stroke

• Yamaha 25D two-stroke - approximately 1995-1998

• Yamaha 25N two-stroke - approximately 1988 onward

• Yamaha 25NMH two-stroke

• Corresponding Yamaha-built Mariner 20HP and 25HP gearcases using the 6L2 pump

  

• HP Range: 20HP - 25HP

• Engine Type: Yamaha two-cylinder two-stroke outboard

• Year Range: Approximately 1988 through the 2010s, dependent on model.

  

🔌 Function

  

The kit restores the impeller chamber, sealing surfaces and drive connection required for reliable cooling-water circulation.

  

Common signs the kit is required:

  

• Weak tell-tale flow

• Engine overheats

• Impeller vanes are damaged

• Wear plate or cartridge insert is scored

• Pump has not been serviced within the recommended interval

  

📦 Condition

  

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 60.0 AUD
- **Vendor:** Yamaha
- **Tags:** Yamaha Marine Parts | Outboard Engine Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 60.00 AUD | In stock |

## Images

- 6L2-W0078-00 Yamaha Water Pump Repair Kit | Genuine OEM Yamaha Outboard Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/6l2-w0078-00-water-pump-repair-kit)
> Updated: 2026-07-11