SKU: 7612382210

Water Pump Impeller Kit – Fits Yamaha 20/25/30 HP Outboards & Mariner 20/25/30 HP (Replaces 689-W0078-A6/689-W0078-A4)

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Description

Water Pump Impeller Kit – Fits Yamaha 20/25/30 HP Outboards & Mariner 20/25/30 HP (Replaces 689-W0078-A6/689-W0078-A4)Water Pump Impeller Kit Fits Yamaha 20 25 30 HP & Mariner 20 25 30 HP Outboards This water pump impeller repair kit provides the necessary components for servicing the water pump on select Yamaha and Mariner 2 stroke outboards. It is designed to fit Yamaha 25 30 HP models from 19841997 (including C25, CV25, C30, CV30) and specific Mariner 20 30 HP models (20C, 25C, 30A) with corresponding serial numbers. This kit is a direct replacement for Yamaha

Water Pump Impeller Kit – Fits Yamaha 20/25/30 HP & Mariner 20/25/30 HP Outboards

This water pump impeller repair kit provides the necessary components for servicing the water pump on select Yamaha and Mariner 2-stroke outboards. It is designed to fit Yamaha 25-30 HP models from 1984–1997 (including C25, CV25, C30, CV30) and specific Mariner 20-30 HP models (20C, 25C, 30A) with corresponding serial numbers.

This kit is a direct replacement for Yamaha part numbers 689-W0078-A6-00, 689-W0078-A4-00, and 689-W0078-04-00, as well as several aftermarket equivalents from Sierra Marine, GLM Marine, and Mariner.

  • Engineered for durability with high-quality materials to ensure reliable cooling performance.
  • Features an impeller designed for higher flow rates to maintain optimal engine temperature.
  • Provides a complete solution with an impeller, housing, wear plate, gaskets, and hardware for a full replacement.

Part Number Cross-Reference

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

Brand Part Number
Yamaha 689-W0078-A6-00 / 689-W0078-A4-00 / 689-W0078-04-00
Sierra Marine 18-3426 / 18-3427
GLM Marine 12059 / 12058
Mariner 42431M / 84829M / 97793M / 97793T

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.

Yamaha Outboard

Brand Model Rated HP Stroke Years OEM Part No. Notes
Yamaha 25 HP 25 2-Stroke 1984-1985 689-W0078-A6-00
Yamaha 25 HP 25 2-Stroke 1986-1987 689-W0078-A6-00
Yamaha C25 25 2-Stroke 1991-1997 689-W0078-A6-00
Yamaha CV25 25 2-Stroke 1990 689-W0078-A6-00
Yamaha 30 HP 30 2-Stroke 1986 689-W0078-A6-00
Yamaha C30 30 2-Stroke 1991-1992 689-W0078-A6-00
Yamaha CV30 30 2-Stroke 1989-1990 689-W0078-A6-00

Mariner Outboard

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mariner 20C 20 2-Stroke All Years 42431M S/N prefix number 6A9
Mariner 25C 25 2-Stroke All Years 42431M S/N prefix number 6A9
Mariner 30A 30 2-Stroke All Years 42431M S/N prefix number 684

Technical Specifications

Specification Value
Product Type Water Pump Impeller Repair Kit
Installation Direct OEM Replacement
Other Technical Attributes Designed for durability with higher flow rates for optimal engine cooling

Package Contents

  • 1 x Water Pump Impeller (689-44352-02-00)
  • 1 x Woodruff Key (664-44338-00-00)
  • 1 x Pump Housing (689-44311-03-00)
  • 1 x Insert Cartridge (689-W4432-01-00)
  • 1 x Wear Plate (689-44323-02-00)
  • 1 x Gasket (689-44324-A0-00)
  • 1 x Gasket (689-44315-A0-00)
  • 1 x Water Seal (626-44365-01-00)
  • 3 x Bolt with washer (97080-06030-00)

Installation Guide

  1. Disconnect the negative battery cable and remove the engine cover for safety.
  2. Locate and unbolt the lower unit (gearcase) from the outboard's midsection.
  3. Carefully lower and separate the gearcase to expose the driveshaft and water pump assembly.
  4. Remove the bolts securing the water pump housing and slide the housing off the driveshaft.
  5. Take note of the old impeller's orientation, then remove it along with the woodruff key.
  6. Remove the old wear plate and gaskets, then thoroughly clean all mating surfaces.
  7. Install the new lower gasket and wear plate.
  8. Place the new woodruff key in its slot on the driveshaft and slide the new impeller on, rotating the driveshaft clockwise to seat the vanes.
  9. Install the new insert cartridge and gasket into the pump housing.
  10. Slide the new housing assembly over the impeller and secure it with the bolts, tightening to the manufacturer's specified torque.
  11. Carefully guide the driveshaft back into the powerhead while reattaching the lower unit.
  12. Reconnect the battery, start the engine in water, and confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?

A: This kit is designed for specific Yamaha 25-30 HP models (1984-1997) and Mariner 20-30 HP models requiring a 6A9 or 684 serial number prefix. Please carefully review the "Compatible Engine Models" table and cross-reference your engine's model, year, and serial number before purchasing to ensure a correct fit.

Q: What are the signs my water pump impeller needs replacement?

A: The most common signs of a failing impeller are engine overheating alarms, a weak or inconsistent water stream from the tell-tale outlet, or a complete lack of water flow. Upon inspection, a worn impeller may have brittle, cracked, or broken vanes.

Q: How often should I replace the water pump impeller?

A: As a crucial part of preventative maintenance, we recommend inspecting the impeller annually and replacing the entire water pump kit every 1-2 years or every 100-200 hours of operation. Replacement frequency may vary based on usage (saltwater vs. freshwater) and operating conditions.

Q: Is this a complete kit with the housing included?

A: Yes, this is a comprehensive repair kit. It includes the water pump housing, impeller, wear plate, insert cartridge, woodruff key, and all necessary gaskets, seals, and bolts as detailed in the "Package Contents" list.

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: 7612382210

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4.5 ★★★★★
Based on 19 reviews
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Verified Purchase
DCat
Waukegan, US
★★★★★ 5
I’m A PT AND USING THEM IN MY CLINIC. PLS READ HONEST AND THOROUGH REVIEW.
Style: 15 Pound, Pair
I have been a PHYSICAL THERAPIST FOR 30 YEARS and I BOUGHT THESE FOR MY CLINIC. THESE WEIGHTS ARE COVERED IN A GRIPPING MATERIAL, NEOPRENE, MAKING IT COMFORTABLE and EASIER TO USE, ALLOWS YOU TO NOT LOSE YOUR GRIP, and IT IMPROVES THE SAFETY OF THE USER. I WILL BE BUYING THE 12&20 lb sets! THE VALUE FOR YOUR MONEY IS WONDERFUL!! AMAZON BASICS REALLY CAME THROUGH. It DID NOT INCLUDE AN INSTRUCTION GUIDE TO USE WEIGHTS SAFELY AND EFFECTIVELY. STELLAR FORM IS ALWAYS ESSENTIAL. MY WEIGHTS WENT UP TO 10 POUNDS, SO I DEFINITELY NEEDED ADDITIONAL WEIGHTS for those who can SAFELY TRANSITION . I MAINLY WORK AS A MANUAL THERAPIST …USING ONLY MY HANDS, AND MY BRAIN. TO DIAGNOSE AND TREAT ACCORDINGLY. (**ANYONE WHO HAS BEEN TO PT KNOWS THIS KIND OF ONE ON ONE TREATMENT IS UNHEARD OF**) I IMPLEMENTED MYOFASCIAL RELEASE, TRIGGER POINT THERAPY, DEEP TISSUE MASSAGE, AND APPROPRIATE STRETCHING AND EXERCISE . ONCE PATIENTS WERE ABLE, I INITIATED THERAPEUTIC EXERCISE. I WAS GETTING SO MANY REFERRALS THAT I MOVED FROM MY SMALL SPACE AND GOT A LARGER SPACE THAT LOOKS LIKE A TYPICAL PT CLINIC. I STILL EMPLOY ONE ON ONE TREATMENT, NO JUGGLING SEVERAL PATIENTS IN AN HOUR. I HAVE HIRED HELP TO ASSIST PATIENTS WITH EXERCISE AND STRETCHING. I PURCHASED TWO ADDITIONAL SETS ITHE SET IT I DID TO FIRST CHECK THEM OUT. I ADORE THESE AND HAVE SINCE ORDERED OTHER SETS. I LOVE TO WORKOUT AND I NEEDED TO USE THESE WEIGHTS MYSELF!! THERE ARE ALSO PATIENTS OF MINE WHO WILL PROGRESS TO THESE AS WELL. I AM SUPER IMPRESSED WITH THESE WEIGHTS AND CANNOT WAIT TO RECEIVE MY TWO OTHER SETS!! YOU WILL NOT BE DISAPPOINTED. EVEN IF YOU SWEAT, YOU ARE STILL ABLE TO HOLD ONTO THESE WEIGHTS COMFORTABLY AND SAFELY. SAFETY IS KEY, ALWAYS. I WAS EXTREMELY DELIGHTED THAT THEY ARE SOLD AS A SET BECAUSE MANY ARE SOLD SEPARATELY. THEY FIT PROPERLY ON A UNIVERSAL WEIGHT STAND, SO THEY ARE VERY EASY TO STORE. I CANT WAIT TO GET MY OTHER SETS! IT IS REALLY SAFE AND COMFORTABLE TO USE THESE WEIGHTS. THEY DID NOT GIVE OFF AN ODD ODOR, which is A HUGE PLUS because SOME OTHER BRANDS SMELL HEAVILY OF PLASTIC OR A CHEMICAL TYPE ODOR. THERE WAS NO ODOR AT ALL. THIS IS A HUGE PLUS. I AM COMFORTABLE SAYING THAT THESE WEIGHTS WILL LAST A LONG TIME BECAUSE OF HOW WELL THEY ARE MADE. YOU CANNOT BEAT THE PRICE EITHER!! THESE ARE ABSOLUTELY APPROPRIATE FOR PROFESSIONAL USE, AND, THEY ARE MEANT FOR PERSONAL USE AS WELL. SOMETIMES YOU JUST CANNOT GET TO THE GYM SO THIS IS WHERE THEY ARE KEY. HAND WEIGHTS HAVE THE ABILITY TO EXERCISE EACH MUSCLE OF THE TORSO AND ARMS. THERE ARE SOME EXCELLENT WEIGHT CHARTS OUT THERE TO SHOW YOU HOW TO DO THAT. IF YOU ARE GOING TO PHYSICAL THERAPY, THEN YOUR THERAPIST CAN INSTRUCT YOU AND KEEP YOU IN GOOD FORM. YOU COULD POSSIBLY HURT YOURSELF IF YOU WORKOUT INCORRECTLY. AS FAR AS THE LOWER EXTREMITIES, YOU CAN DO GROSS MOTOR EXERCISES BY HOLDING THESE WEIGHTS TO GET YOUR LEG MUSCLES BY DOING SQUATS, WALKING LUNGES, TOE RAISES, AND MORE. I DONT BELIEVE THAT MANY PEOPLE REALIZE JUST HOW MUCH YOU CAN DO FULL BODY EXERCISES WITH JUST TWO HAND WEIGHTS. IN CONCLUSION , THESE ARE EXCELLENT WEIGHTS THAT I WOULD RECOMMEND TO MY PATIENTS OR FRIENDS. THIS IS A HIGH QUALITY PRODUCT THAT WONT BREAK YOUR PIGGY BANK. I HIGHLY RECOMMEND VERY HIGHLY!. BUY WITHOUT RESERVATION!! A+++
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 23, 2025
A
Verified Purchase
Aimee C.
Pawtucket, US
★★★★★ 4
Perfect size and weight with compact size
Style: Rack with 3 Pairs (3, 5, and 8 Pound)
I purchased the Amazon Basics Neoprene Dumbbell Hand Weights specifically for Pilates, and they’ve been a great addition to my routine. The size and weight are perfect for controlled movements, helping with muscle toning without feeling too bulky or awkward. The neoprene coating gives them a comfortable, non-slip grip, which is especially important during longer sessions or when your hands get a little sweaty. They feel secure and easy to hold through a full workout. I also like the shape—they don’t roll around on the floor, which makes transitions between exercises smoother and less frustrating. They’re compact enough to store easily but still feel durable and well-made. Overall, these are a simple, affordable, and effective option for Pilates or light strength training. I’d definitely recommend them for anyone looking to add a little resistance to their workouts without overcomplicating things.
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Reviewed in the United States on April 20, 2026
J
Verified Purchase
J. saroukhan
Natrona Heights, US
★★★★★ 5
Well made , gym quality
Style: 10 Pound, Pair
Color is nice and bright . The weights grips are good they do not slip . Prices reflect quality
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Reviewed in the United States on May 29, 2026
K
Verified Purchase
Kim Wood
Charlottesville, US
★★★★★ 5
Good purchase
Style: 3 Pound, Pair
These are just the right weight for me to start gaining muscle back in my arms, after a large weight loss. They are of good quality, they are covered in a nice rubber like coating that is soft to the touch. They are small enough that i can take them with me when I travel. My dog has got hold of them a couple times and played with them, and they held up just fine without any damage.
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Reviewed in the United States on April 28, 2026
K
Verified Purchase
Ky Mogg
Natrona Heights, US
★★★★★ 5
Solid, grippy, and they don’t roll away!
Style: 10 Pound, Pair
I bought these because I’m finally trying to build a consistent home workout routine and didn't want to drop a fortune on name-brand weights. I’ve been using this 10lb pair for about a month now for everything from overhead presses to lunges, and honestly, they’re exactly what I was looking for. The Pros: • That Neoprene Grip: The coating is fantastic. Even when my hands get pretty sweaty halfway through a workout, I don’t feel like I’m going to drop them. It’s a much "softer" feel than cold metal or hard plastic. • The Hex Shape: This is a small detail that makes a huge difference. Since the ends are hexagonal, they don't roll across the floor when I set them down between sets. They also stay put if I’m using them for "renegade rows" or floor work. • Compact Size: They aren’t bulky. I can easily shove them under my bed or in the corner of the closet when I’m done. • No Weird Odor: I was worried they might smell like a tire factory (which happens with some rubber-coated weights), but these had almost no scent right out of the box. The Cons: • Handle Diameter: The handles are a little on the thicker side. I have medium-sized hands and it’s fine, but if you have very small hands, they might feel a bit chunky to wrap your fingers all the way around. • Color Scuffs: The navy blue looks great, but if you clank them together or drop them on concrete, the coating can scuff or show dust pretty easily. The Verdict: If you just need a reliable set of weights for HIIT, Pilates, or general strength training, these are a no-brainer. You're basically getting gym-quality equipment for a fraction of the price. I’ll probably be back for the 15lb set in a few months!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2026

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