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

🚤 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 of Failure

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

🔄 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

📦 Condition

• Genuine Yamaha part
• Brand new
• Supplied in original or equivalent packaging