61A-W0078-A4 Yamaha Impeller Repair Kit | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Water Pump / Impeller Repair Kit - Part Number: 61A-W0078-A4-00

A genuine Yamaha OEM water pump repair kit used for Yamaha outboard lower-unit cooling-system service. This kit includes the impeller, cartridge insert, gaskets, O-rings, dowels, bolts and woodruff key required for a full water pump service on compatible Yamaha outboards.

⚙️ Key Features

• Genuine Yamaha OEM impeller repair kit
• Correct Yamaha part number 61A-W0078-A4-00
• Complete water pump service kit
• Includes Yamaha cartridge insert 61A-44322-02-00
• Used on selected Yamaha 150HP to 300HP two-stroke, HPDI and four-stroke outboards

🚤 Compatibility

Commonly used on

• Yamaha high-output outboard water pump assemblies
• Yamaha 61A-series impeller and water pump repair systems

Typically suits

• Engine models:
• Yamaha F150 four-stroke water pump service applications
• Yamaha F175 four-stroke water pump service applications
• Yamaha F200 four-stroke water pump service applications
• Yamaha F225 four-stroke water pump service applications
• Yamaha F250 four-stroke water pump service applications
• Yamaha 150HP two-stroke water pump service applications where 61A-W0078-A4 is specified
• Yamaha 175HP two-stroke water pump service applications where specified
• Yamaha 200HP two-stroke and HPDI water pump service applications where specified
• Yamaha 225HP two-stroke / HPDI / four-stroke water pump service applications where specified
• Yamaha 250HP two-stroke / HPDI / four-stroke water pump service applications where specified
• Yamaha VZ / VX / SX / LX / Z-series outboards using the 61A-W0078-A4 water pump kit
• Yamaha 300HP applications where the water pump diagram specifies 61A-W0078-A4
• HP Range: commonly 150HP - 300HP where specified
• Engine Type: Yamaha two-stroke, HPDI and four-stroke outboard lower-unit water pump assembly
• Year Range: model-specific Yamaha 61A-W0078-A4 water pump kit applications
• Kit Type: Complete water pump / impeller repair kit

🔌 Function

The water pump repair kit restores the lower-unit cooling pump assembly. The impeller draws water from the intake, the insert cup and plate provide the pump chamber surfaces, and the gaskets / O-rings seal the assembly so cooling water can be delivered to the engine.

⚠️ Common Signs of Failure

• Weak tell-tale water flow
• Engine overheating or temperature alarm
• Impeller blades cracked, missing or permanently bent
• Pump housing or insert cup scored from sand or debris
• Water pump service due at maintenance interval
• Dry-running damage to impeller or cup
• Poor cooling pressure at idle or cruise
• Lower unit removed for scheduled cooling-system service

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 61A-W0078-A4-00 later Yamaha water pump repair kit reference
• 61A-W0078-A3-00 related earlier Yamaha water pump repair kit reference
• 61A-W0078-A2-00 related earlier Yamaha water pump repair kit reference

OEM / Related Numbers

• 61A-W0078-A4-00
• 61A-W0078-A4
• 61AW0078A400
• 61AW0078A4
• 61A-W0078-A3-00
• 61A-W0078-A3
• 61A-W0078-A2-00
• 61A-W0078-A2

Included / Related Kit Components

• 61A-44322-02-00 Cartridge Insert
• 6E5-44352-01-00 Impeller
• 6G5-44323-01-00 Cartridge Outer Plate
• 6E5-44315-A0-00 Water Pump Gasket
• 93210-86M38-00 O-Ring
• 93210-37M67-00 O-Ring
• 93606-12019-00 Dowel Pins
• 90119-08M14-00 Bolts with Washers
• 90280-04M05-00 Woodruff Key

Aftermarket / Verified Equivalents

• Sierra: 18-3396-1
• Aftermarket reference: 61A-W0078-A4
• Aftermarket reference: 61A-W0078-A3
• Aftermarket reference: 61A-W0078-A2
• Yamaha 61A water pump repair kit replacement family with impeller and cartridge insert
• Aftermarket kit family including water pump housing 61A-44311-01 where supplied
• Aftermarket component cross references include 61A-44322-02 cartridge insert and 6E5-44352-01 impeller

📦 Condition

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