Water Pump Repair Kit – Fits Yamaha 115-300 HP Outboard Motors (Replaces 6G5-W0078-A1-00, 6G5-W0078-00-00)

Water Pump Repair Kit – Fits Yamaha 115-300 HP Outboard Motors

This water pump repair kit is designed for a wide range of Yamaha 2-Stroke outboard motors from 115 HP to 300 HP, including popular 150, 175, 200, and 225 HP models manufactured between 1984 and 1992.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Yamaha 6G5-W0078-A1-00, 6G5-W0078-00-00, and 6G5-W0078-01-00; Sierra 18-3311 and 18-3310; GlückMarine 6G5W0078; KUNOANZ KU-002093; and WINGOGO 6G5-W0078-A1-00.

• Installation Type: Direct OEM replacement fit.
• Durable Materials: Features a tough nylon housing and a CR-Neoprene impeller for reliable performance.
• Complete Assembly: The kit includes the water pump housing, impeller, wear plate, insert cup, gaskets, and all necessary hardware for a full replacement.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (6E5-44352-00-00/6E5-44352-01-00)
• 1 x Wear Plate (6G5-44323-00-00/6G5-44323-01-00)
• 1 x Insert Cup (61A-44322-00-00)
• 1 x Gasket (6E5-44315-00-00/6E5-44315-A0-00)
• 1 x Key (90280-04M05-00/93210-86M38-00)
• 4 x Bolt (91290-08045-00/97095-08045-00/97290-08045-00/97370-08045-00/97395-08045-00)
• 1 x O-Ring (93210-86M38-00)
• 1 x O-Ring (93210-37160-00/93210-37M67-00)
• 2 x Pin Dowel
• 1 x Water Pump Housing (61A-44311-00-00/61A-44311-01-00/6E5-44311-00-00)

Installation Guide

1. Ensure the engine is off, the battery is disconnected, and the motor is cool to the touch.
2. Remove the lower unit (gearcase) from the outboard's driveshaft housing. This typically requires removing several bolts.
3. Locate the water pump assembly on top of the lower unit and unbolt the housing.
4. Carefully remove the old impeller, wear plate, gaskets, and cup, taking note of their orientation.
5. Thoroughly clean the mating surfaces to remove any old gasket material or debris.
6. Install the new gasket, wear plate, and insert cup, ensuring they are seated correctly.
7. Slide the new woodruff key onto the driveshaft and then install the new impeller, turning the driveshaft clockwise to bend the vanes correctly inside the housing.
8. Secure the new water pump housing with the provided bolts, tightening them to the manufacturer's specified torque.
9. Re-install the lower unit onto the outboard motor.
10. Once fully assembled, reconnect the battery and test the engine in water, confirming a steady water stream from the tell-tale outlet.

Troubleshooting & FAQ

How can I confirm this kit fits my Yamaha engine?
Our compatibility table lists specific Yamaha models, years, and horsepower ratings. Please cross-reference your engine model with the 'Compatible Engine Models' table. For additional help, you can use the Yamaha Serial Number Guide linked above to identify your engine details accurately.

What are the signs of a failing water pump?
Common symptoms include the engine overheating, a weak or inconsistent water stream from the 'tell-tale' outlet, or a high-temperature warning alarm. Reduced engine performance can also be a sign of poor cooling.

How often should I replace my water pump impeller?
For most outboard motors, it is recommended to inspect the water pump and replace the impeller every 1-2 years or every 100-200 hours of use. Service intervals can vary based on operating conditions like saltwater use, high-RPM running, or operation in debris-heavy water.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.