SKU: 36355036668

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

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Description

Water Pump Impeller Kit – Fits Yamaha 25–70 HP Outboards (Replaces 663-44311-02)Water Pump Impeller Kit Fits Yamaha 2570 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

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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 36355036668

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Carm
Natrona Heights, US
★★★★★ 1
Timex now poor quality
Color: Blue/Black
These watches used to last me years. The past two of these have died in under 6 months. Worthless junk. Will avoid Timex from now on. A single drop of water and the button sends the watch into black screen and reset.
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Reviewed in the United States on May 25, 2026
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Atomask
Fort Morgan, US
★★★★★ 3
Good basic digital watch for women
Color: Black/Gray Stripe, Color: Black/Gray Stripe
Okay, so it's a great watch for women with small to medium wrists. Here's my pros and cons list: Pros: - Super easy to set. The package insert does NOT include instructions. This is my first Timex Expedition watch, so I had no experience going in. All you do is press Set and you use the Start and Stop buttons to move up and down, respectively, through the settings. Easy enough! - I love the simplicity of the watch. It's simple and easy to read. - It has the day of the week AND the month AND the date. I wanted to make sure any watch I get has these features. - The watch band seems high quality. It is fabric/nylon, so it should hold up for several years (we'll see I guess). - The Indiglo is pretty and works great in the dark! Cons: - I have to tighten the band as tight as possible in order to prevent the watch from wobbling around my wrist. It may be because my wrist is small and the watch itself is a bit heavy in comparison. I AM new to wearing a watch, so maybe it's just something I have to get used to. - The display is perfect, but only when looking at it straight on (when facing you directly). If you were to glance over at your watch while you're typing on your computer, you can't see the time. It's too blurry. So the viewing angles are terrible. You can only see the time if you look directly at it. Again, this might be an issue with all digital watches, but I sort of expected more in today's technological world. This is probably my biggest con and biggest disappointment. - The band holder is also nylon, so I had some trouble getting the extra band into the band holder. Now that I think more about it, I'm not sure what a better alternative would be for a nylon band... maybe if they glued the band holder on to the band, it wouldn't move around so much when trying to insert the band into the holder. Once you're inserted it, it seems to stay in place, though. So that's good. But I can see it loosening up and not working well in the future. I've only had this watch since yesterday, so I haven't been able to test its waterproofness yet. I will update this review if I am unhappy with the waterproofness. Overall, it's exactly what I was looking for: a basic digital watch that shows the day and date, with a band that is small enough to fit my female wrist. However, I would have liked it better if the price was $10-15 less than what I paid for it. UPDATE: I've since moved on to a few other watches since this one. I have concluded that I do NOT like having a cloth/nylon watch band, and I prefer the rubber/plastic bands now. The nylon band takes way too long to dry after a shower, whereas the plastic bands don't need ANY drying time. There are a lot of good plastic banded watches out there, and I've tried a few no-name brands on Amazon and have been happier with them than I was with this Timex. They are also not as heavy and floppy on my wrist.
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Reviewed in the United States on July 6, 2016
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Ahmed Khalil
Chelsea, US
★★★★★ 5
Comfortable, stylish, and great for work or casual wear
Size: 36W x 32L, Color: Black
These DKNY slim fit chinos are a great balance between comfort and style. The stretch material makes a big difference — they move well throughout the day and don’t feel restrictive like some other slim fit pants. The fit is modern and clean without being too tight, which makes them easy to wear for both work and more casual settings. They look polished enough for the office but still comfortable enough for everyday use. The fabric feels good quality and has held up well so far. They don’t wrinkle too easily and keep their shape after wearing them for a full day. The 5-pocket design is also a nice touch, adding a bit of versatility compared to more traditional dress pants. If I had to mention one minor thing, it would be that sizing can feel slightly snug depending on preference, so if you’re between sizes you might want to consider sizing up. Overall, really solid pair of chinos — comfortable, versatile, and good quality for the price.
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Reviewed in the United States on April 28, 2026
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D. Carter
Phoenix, US
★★★★★ 5
Excellent value for the quality and fit.
Size: 34W x 29L, Color: Khaki
Love these pants. So much that after wearing the light khaki pair a few time I bout a navy blue pair. I'm 5"5" and finding 29" inseam pants is a challenge, these fit perfectly and my flat butt isn't saggy baggy with the slim fit. They are NOT Skinny in the legs. The material is smooth as silk and I didn't need to iron them after washing. You would pay much more for anything close in a department store. The stretch is great, I can go without a belt confidant they won't fall down.
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Reviewed in the United States on May 20, 2026
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Phillip Beck
Massapequa, US
★★★★★ 5
Fit sizing
Size: 36W x 29L, Color: Navy
Good fit, accurate sizing, comfortable, nice looking
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Reviewed in the United States on June 3, 2026

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