Water Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards (Replaces 663-44311-02)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller Kit
$46.50
$46.50
Subtotal: $46.50

Free Shipping

Free standard shipping on all orders under 1 KG

Worry-Free Returns

Learn More.
Water Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards (Replaces 663 - 44311 - 02) - JLM Marine Boat Parts Limited

Water Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards (Replaces 663-44311-02)

$46.50

Water Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards (Replaces 663-44311-02)

$46.50

Water Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards

This water pump impeller kit is a comprehensive solution for rebuilding the water pump assembly on Yamaha outboard motors from 25 to 70 horsepower. It is engineered to restore the cooling system to its original performance, preventing engine overheating and ensuring long-term reliability.

This kit directly replaces Yamaha OEM part numbers: 663-W0078-01, 663-W0078-A0, 6H3-W0078-02-00, and 6H3-W0078-A0-00.

  • Fitment: Designed for Yamaha 2-Stroke outboards from 25 HP to 70 HP (1984–2005).
  • Complete Assembly: Includes all necessary components shown in the detailed parts list for a full water pump service.
  • Installation: Installs directly as a replacement for the original factory components without modification.

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.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Yamaha C-55 55 2-Stroke 1991–1995 663-W0078-01, 663-W0078-A0
Yamaha CV-55 55 2-Stroke 1989 663-W0078-01, 663-W0078-A0
Yamaha C-60 60 2-Stroke 1997–2001 6H3-W0078-02-00
Yamaha C-70 70 2-Stroke 2000–2001 6H3-W0078-02-00
Yamaha P-60 60 2-Stroke 1997–1999 6H3-W0078-02-00
Yamaha T-50 50 2-Stroke 1997–2001, 2003, 2005 6H3-W0078-02-00
Yamaha T-60 60 2-Stroke 2003–2005 6H3-W0078-02-00
Yamaha 60 60 2-Stroke 2003 6H3-W0078-02-00
Yamaha 70 70 2-Stroke 1997–2003 6H3-W0078-02-00
Yamaha T50 50 2-Stroke 1996 6H3-W0078-A0-00
Yamaha C55 (Drive 2) 55 2-Stroke 1991–1994 6H3-W0078-A0-00
Yamaha CV55 (Drive 2) 55 2-Stroke 1989 6H3-W0078-A0-00
Yamaha P60 60 2-Stroke 1991 6H3-W0078-A0-00
Yamaha 60 60 2-Stroke 1984–1991 6H3-W0078-A0-00
Yamaha 40 40 2-Stroke 1984–1994 6H4-W0078-00
Yamaha 50 50 2-Stroke 1986–1994 6H4-W0078-00
Yamaha Pro 50 50 2-Stroke 1991–1994 6H4-W0078-00

Technical Specifications

Specification Value
Product Type Water Pump Impeller Kit
Installation Direct OEM replacement
Other Technical Attributes Maintains proper cooling water circulation for outboard motors

Package Contents

  • 1 x Cartridge Insert (663-44322-00-00)
  • 1 x Impeller (6H3-44352-00-00)
  • 1 x Water Pump Gasket (663-44315-A0-00)
  • 1 x Cartridge Outer Plate (663-44323-00-00)
  • 1 x Cartridge Gasket (663-44324-A0-00)
  • 2 x Bolts (97095-08055-00)
  • 2 x Bolts (97095-08045-00)
  • 1 x Water Seal Damper 2 (663-44366-00-00)
  • 1 x Woodruff Key (90280-03M03-00)

Installation Guide

  1. Disconnect the battery and remove the engine cover.
  2. Drain the lower unit gear oil.
  3. Remove the lower unit by unbolting it from the midsection.
  4. Remove the old water pump housing bolts and lift the housing off.
  5. Take note of the old components and remove the old impeller, gaskets, and plates.
  6. Clean all mating surfaces thoroughly.
  7. Install the new gaskets, plates, impeller, and key from the kit.
  8. Lubricate the inside of the housing and the new impeller with a marine-safe lubricant.
  9. Reinstall the water pump housing and torque the bolts to the manufacturer's specification.
  10. Reattach the lower unit, refill the gear oil, and reconnect the battery.
  11. Start the engine and verify water is discharging from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific engine?
A: The surest method is to check your original part number against the ones listed in this description. You can also consult our Compatible Engine Models table and use the Yamaha Serial Number Guide to verify your motor's model and year.

Q: What are the symptoms of a failing water pump impeller?
A: Common signs include the engine overheating at idle or low speeds, a weak or non-existent stream from the "tell-tale" water outlet, or a high engine temperature alarm.

Q: How often should I replace my water pump impeller?
A: As a general rule, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

Q: Is the complete water pump housing included?
A: This is an impeller repair kit and does not include the main pump housing. It is designed to rebuild your existing housing assembly with all new wear parts.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

Exclusive for new customers

10% OFF

Enter the discount code “WELCOMEJLM” on the checkout page to receive your exclusive new customer discount!

Recently Viewed Products