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Description
Water Pump Repair Kit – Fits Yamaha F30, F40 Outboard Motors (Replaces 6BG-W0078-00-00)Water Pump Repair Kit Fits Yamaha F30, F40 Outboard Motors (Replaces 6BG W0078 00 00) This water pump repair kit provides a complete solution for servicing the cooling system on a range of Yamaha outboard motors. It is designed to fit 4 stroke models from 30 to 40 HP, including F30, F40, and T25 variants manufactured between 2008 and 2017. This kit is a direct replacement for Yamaha part numbers 6BG W0078 00 00 and 6BG W0078 01 00, as well as Sierra
Water Pump Repair Kit – Fits Yamaha F30, F40 Outboard Motors (Replaces 6BG-W0078-00-00)
This water pump repair kit provides a complete solution for servicing the cooling system on a range of Yamaha outboard motors. It is designed to fit 4-stroke models from 30 to 40 HP, including F30, F40, and T25 variants manufactured between 2008 and 2017.
This kit is a direct replacement for Yamaha part numbers 6BG-W0078-00-00 and 6BG-W0078-01-00, as well as Sierra aftermarket part 18-3490.
- Engineered as a direct OEM-spec replacement for straightforward installation.
- Restores cooling system performance to prevent engine overheating.
- Includes a new impeller, housing, gaskets, plate, and hardware for a comprehensive service.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 6BG-W0078-00-00 |
| Yamaha | 6BG-W0078-01-00 |
| Sierra | 18-3490 |
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 | F30 | 30 | 4-Stroke | 2013–2017 | 6BG-W0078-00-00 | |
| Yamaha | F30TLR | 30 | 4-Stroke | 2001–2005 | 6BG-W0078-00-00 | |
| Yamaha | F40 | 40 | 4-Stroke | 2008–2017 | 6BG-W0078-00-00 | |
| Yamaha | F40B | 40 | 4-Stroke | 2001–2008 | 6BG-W0078-00-00 | |
| Yamaha | F40EJR | 40 | 4-Stroke | 2003–2006 | 6BG-W0078-00-00 | |
| Yamaha | F40ESR | 40 | 4-Stroke | 2000–2003 | 6BG-W0078-00-00 | |
| Yamaha | F40MJH | 40 | 4-Stroke | 2002–2006 | 6BG-W0078-00-00 | |
| Yamaha | F40MLH | 40 | 4-Stroke | 2000–2006 | 6BG-W0078-00-00 | |
| Yamaha | F40MSH | 40 | 4-Stroke | 2000–2006 | 6BG-W0078-00-00 | |
| Yamaha | F40TLR | 40 | 4-Stroke | 2000–2006 | 6BG-W0078-00-00 | |
| Yamaha | T25 | 25 | 4-Stroke | 2001–2019 | 6BG-W0078-00-00 | |
| Yamaha | T25LA | 25 | 4-Stroke | 2009–2016 | 6BG-W0078-00-00 | |
| Yamaha | T25TLR | 25 | 4-Stroke | 2001–2006 | 6BG-W0078-00-00 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Repair Kit |
| Installation | Direct OEM replacement |
| Other Technical Attributes | Designed for marine outboard cooling system |
Package Contents
- 1 x Pump Housing Cover (63D-44312-00-00)
- 1 x Water Pump Gasket (63D-44316-00-00)
- 1 x Insert Cartridge (63D-44322-00-00)
- 1 x Outer Plate, Cartridge (63D-44323-00-00/66T-44323-00-00)
- 1 x Damper, Water Seal 2 (663-44366-00-00)
- 1 x Impeller (6H4-44352-02-00)
- 4 x Bolt, With Washer (90119-08M15-00)
- 1 x Key, Woodruff (90280-03M03-00)
- 1 x O-Ring (93210-59MG7-00)
Installation Guide
- Disconnect the battery and shift linkage before beginning work.
- Unbolt and carefully remove the lower unit from the outboard motor.
- Remove the bolts securing the water pump housing to access the old components.
- Slide the old pump housing, impeller, and gaskets off the driveshaft, noting their orientation.
- Thoroughly clean the mounting surfaces to remove any old gasket material or corrosion.
- Install the new Woodruff key into the driveshaft, followed by the new gaskets and insert cartridge.
- Slide the new impeller onto the driveshaft. Rotate it clockwise while pushing down to seat the vanes correctly inside the housing.
- Install the new pump housing and outer plate, then secure them with the new bolts provided in the kit.
- Carefully reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Reconnect the shift linkage and battery. Test the engine in water to confirm a strong, steady stream from the cooling system's tell-tale outlet.
Troubleshooting & FAQ
How can I be sure this kit fits my Yamaha F40?
This kit is designed for Yamaha F40 models from 2008–2017. To confirm, check the "Compatible Engine Models" table and match your specific model (e.g., F40TLR) and year. Cross-referencing your old part number with 6BG-W0078-00-00 or 6BG-W0078-01-00 is the best way to ensure an exact match.
What are the signs that my water pump needs to be replaced?
Common signs include the engine overheating at idle or low speeds, a weak or inconsistent stream of water from the tell-tale outlet, or visible damage (cracked or brittle vanes) on the old impeller during a physical inspection.
How often should the water pump impeller be replaced?
As a general maintenance guideline, it is recommended to inspect the impeller annually and replace the kit every 1-2 years or 100-200 hours of use, depending on operating conditions (e.g., frequent use in saltwater or sandy/silty 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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.5 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 3
Great but could be Epic
If you’re looking for a solid edger for sidewalks and driveways, this is a great tool. It’s powerful, well-built, easy to assemble, and simple to use. For edging, I would definitely recommend it.
However, I wouldn’t recommend it as a true trencher. I bought it for both purposes but mainly needed it for trenching. The maximum cutting depth is only about 1.5 inches, which isn’t deep enough for most garden borders or running cable. In my opinion, a real trencher should be able to reach at least 3 inches deep.
The limitation comes down to the blade size and guard design. WORX could improve this model with a larger blade guard and additional wheel depth settings. If they released a version capable of 3–3.25 inch trenching depth, it would really stand out in the market.
Overall, it’s an excellent edger, just not a true trencher.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Works Great!
Much quieter than I was expecting. Lawn had needed this for years, I regained 6"-10" of driveway/sidewalk back. Makes the rest of the neighborhood look bad LOL Only the cleaning up wore me out, but it should be much easier next time.
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Reviewed in the United States on May 16, 2026
★★★★★ 5
Gets the job done for a small lawn
Color: 15-Inch
I have a smaller yard, and this works GREAT!!! I have used it several times now. I do not use the bag because my municipality doesn't pick up yard clippings more than once a year. I mow every 7 to 10 days on a middle setting. The only thing that I can complain about is that it doesn't work well if pulling it in reverse. It still cuts fine, but the rubber flap that keeps the grass from flying back at you is a bit long if you want to be able to pull the mower. It can be removed easily if you choose to, but I would at least recommend wearing eye protection if you take it off since it is there for a reason. It maneuvers easily and gets very close to the edges, so I have not had to weed whack at all! It is a light mower and easy to use. Basic maintenance like keeping it covered or in a dry spot when not in use and flipping it to the side to clean the debris from under it after use, and you should have a good mower for a long time. That being said... I DID get the 3-year warranty on it. I know from a past experience with a different company that electric corded mowers are VERY hard to get serviced, so if anything goes wrong, you basically have to replace it. At least this way, my investment will be guaranteed to last several years.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Worth trying if you want to have fun mowing
Color: 19-Inch-Black
I had already purchased the cute 13” mower from this company and wanted extra batteries. I could have purchased just the batteries and double charger, but it mad more sense to spend a few more dollars and get this larger mower with a side chute so that I could have both types and sizes. The smaller one has a basket, but not a side chute. They’re both incredibly lightweight and easy to use. This one weighs under thirty pounds. It’s box was inside a larger Amazon shipping box which made it harder to get through my front door. I foolishly tried pulling it in, but it kept catching on the storm door. It would have been much easier to simply go around from the back of the house and push it in through the front door so that I could hold the storm door open. Lesson learned. I was able to lift the actual box for the mower. It has push in handles. Carefully lifting the mower out of the box was also fairly easy. And assembly just requires pulling the handles into position and tightening them. I decided to adjust the handle length so it was more comfortable. That might require a helper to hold it if a helper is available. I had to use my legs to hold it in place while I removed the bolts and reinserted them for the new handle length. The height needs to be adjusted so that you can easily move it because it’s set low for shipping. That’s simple with the handle designed for height adjustment. The little key has two prongs which need to be inserted all the way so it works properly. It makes a little clicking sound as it goes into place. The batteries might need to be used and recharged a few times before you can get an idea of how long they’ll last between charges. It’s not reasonable to assume that anyone can mow a large yard in thirty or forty minutes, especially by hand. My yard is around half an acre and it takes hours to mow it by hand with a self-propelled gas mower. A battery powered push mower isn’t going to go faster than a self propelled mower. You’ll be able to mow as much as you can mow before the batteries need to be changed or recharged. If you’re a senior woman like me with chronic medical conditions that cause pain and weakness, chances are that you don’t really want to mow more than thirty or forty minutes without a break anyway. And not having to wrestle with a heavy gas mower is a huge relief. Pushing this mower is like pushing a vacuum. It’s easy to move forward and easy to pull back toward you. Trying to pull a heavy self-propelled gas mower backwards is very difficult and painful for people in my situation. I have lots of bushes and other obstacles to mow around and I get exhausted trying to use my gas mower for this. When I used this nice, lightweight cordless mower, I didn’t get tired at all. I wanted to do a good comparison, so I used this one between two sessions of using the heavy gas mower. With the gas mower, I could only mow for around fifteen minutes before I started to feel like I might collapse. With this mower, I moved over thirty minutes and I actually started to wear out before the batteries did, but I was able to keep mowing until the batteries stopped without feeling like I might collapse any minute. I was able to do housework before and after mowing with this mower. Walking quickly, I mowed around 1/6 of an acre on one charge. Cleaning it is a breeze. Just position it on its side and use a brush with a long enough handle to protect your hands and arms from the blade. You can use a leaf blower on it before and after brushing grass loose, too, if one is handy. And you can put a damp cloth around the brush if you want to wash the residue off. It will probably work best with the side chute in place, but it might handle totally dry grass without the side chute if the grass isn’t terribly long. For a cordless mower under $200, this is a great bargain that could make yard work much less difficult. They have a 16” size with a grass collection bag or basket if you don’t like the side chute style. I have a cordless Craftsman mower with more powerful batteries that’s heavier and much more expensive. I can’t lift that one without hurting myself. This brand was recommended in many online articles as a good, lightweight mower for seniors and people with health conditions. After using it, I can see why. Buying extra batteries is a good idea, but I like having the two different sizes of mowers with batteries that can be shared. I can use this one for mowing and the 13” size for trimming if I prefer to do that. I can’t usually mow the front and back on the same day anymore, so I don’t mind mowing the yard in stages. People can’t see my backyard unless they’re trespassing because it’s surrounded by a fence, so it’s not a problem if it takes two or three days to finish my yard work. And it’s good exercise being able to mow by hand for half an hour at a time. Using this mower isn’t traumatic or painful. And it’s quiet enough to let me hear the birds singing while I mow. I have to wear layers of masks outdoors to avoid serious reactions to certain pollutants, and this mower doesn’t make me out of breath like wrestling with my heavy mower does. This one looks more like a fun mower. The 13” one looks like a fun toy and it’s also fun to use. They will both make my yard work more pleasant. I’ll have to continue using my heavy gas mowers for areas with too many sticks and walnuts dropping from neighbors’ trees, but I’ll use the fun, lightweight ones whenever possible. Using them doesn’t feel like working. They feel like just having fun outdoors. And they can be stored indoors if necessary, especially over the winter. You can’t treat them roughly or you’ll break them. They don’t need rough treatment. They’re designed so that people with weak hands can also use them safely and comfortably. People with health conditions can understand this. Men who want heavy duty tools cannot and they would be better off spending the extra money on heavy duty tools. Seniors and women who are tired of getting hurt while trying to mow the grass will probably be grateful for this mower. I certainly am. And when it eventually breaks, I’ll buy another one. It’s much cheaper than having to pay someone else to do a crummy job mowing my lawn.
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Reviewed in the United States on May 6, 2026
★★★★★ 4
It's fine
Color: 13-Inch
It has an easy assembly and works as intended. This mower is not for large yards. It will not work for a large yard. If you have a yard larger than 500sqft in total, it will work, but it's not going to get the job done in one shot. Right now, with the grass being long and unruly, it drains both batteries just doing one half of the total yard I have. I'm sure it will last a lot longer when I'm not having to constantly restart from clogging, but the long grass is a challenge for it.
It looks decent and it's quieter than a gas. Unfortunately it's a cheap plastic, so it's a little wobbly and struggles to get over bumps. If you're willing to struggle over uneven terrain and cut a bit low in spots, go for it. Otherwise try to mow as flat a surface as possible.
Also you can stick a rod to prop open the clipping hatch if you're sick of constantly dumping the thing.
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Reviewed in the United States on May 3, 2026