Skip to product information
Water Pump Repair Kit for Yamaha Outboard 300 350 HP 6AW W0078 00 00 18 3477
$83.59
Sale price
$83.59
Regular price
Quantity
Pickup currently not available
Secure Checkout • Encrypted Payments
Free Shipping
Contiguous U.S.
1-Year Warranty
Parts you can rely on
30-Day Returns
Hassle-free returns
Need help confirming fitment?
Talk with a parts expert today.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Equipment Fitment
Review the equipment and model information below. Fitment can vary by serial number, production date, or machine configuration, so confirm your model and reference numbers before ordering.
Equipment / model
- Yamaha Outboard 300 HP (2-stroke and 4-stroke models)
- Yamaha Outboard 350 HP (all variants)
Product Overview
The Water Pump Repair Kit restores cooling system performance on Yamaha Outboard 300 HP and 350 HP engines. This kit is essential for maintaining proper water flow and preventing overheating, making it ideal for boat owners and marine mechanics servicing Yamaha outboards.
Key Features & Performance
- Includes all necessary seals, gaskets, and impeller for a complete water pump overhaul
- Engineered to OEM specifications for Yamaha 300 HP and 350 HP outboards
- High-temperature resistant materials ensure long service life
- Direct replacement for OEM part numbers 6AW-W0078-00-00 and 18-3477
- Helps prevent engine damage from overheating due to water pump failure
Common Uses
- Replacing worn water pump components during routine outboard maintenance
- Repairing a failed water pump that causes insufficient cooling
- Restoring water flow after a clogged or damaged impeller
- Annual or bi-annual water pump replacement in saltwater environments
Technical Specifications
- Part Number(s): 6AW-W0078-00-00, 18-3477
- Kit Includes: Impeller, gasket, o-rings, seals
Frequently Asked Questions
Q: Is this water pump repair kit compatible with Yamaha 250 HP outboards? A: No, this kit is specifically for Yamaha 300 HP and 350 HP models; other HP ratings use different pump components.
Q: Does the kit include the housing or just internal parts? A: This kit contains the internal repair components (impeller, seals, gaskets); the water pump housing must be reused or replaced separately if damaged.
Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.