Boyesen Supercooler Water Pump Kit
Boyesen Supercooler Water Pump Kit

$163.99 - $203.99
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Item #BOY0003

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26 Reviews
4.9 out of 5 stars
5 Star   26 4 Star   2 3 Star   1 2 Star   0 1 Star   0
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All Reviews
Whiteville, NC 28472, USA

I bought this pump for my two Yamaha’s and now my ktm. I would highly recommend this product to anyone. It definitely helps out here in the hot summers we have in the Carolinas.

Verified Purchaser
Water pump

So it’s not really clear what models come with gaskets and which ones do not. I ordered this kit for my 2017 yz450f the kit came with the pump cover gasket. Unfortunately you have to remove the right side case cover and replace the impeller shaft. So be sure you order the supplies for an oil change and the case gasket with this pump.

Verified Purchaser
Good Stuff

Pretty good stuff

Verified Purchaser
Florida, USA
Boysen hit it outta the park!!

Supercooler is just that, consistent 8 degree temperature drops over stock in 95 degree Florida heat!! Worst part of installation is draining the coolant, other then that 5 minutes later Braaap!!!

It runs cooler and looks cool

purchased this product for my 2009 crf450r so it would have better flow and less cavitation. the product does what its advertised to do, I can certainly say the bike runs a lot cooler with a fatter radiator especially in sunny Yuma AZ.

Great Purchase

My crf450r was having trouble staying cool, so I purchased this item. It only took 15 minutes to install, great product my bike runs a lot cooler after installing the boyesen supercooler. Definitely recommend buying this item.

Verified Purchaser
Worth It

You hear a lot of rumors about aftermarket pumps but this one is the one. It really works. When compared with the stock impeller this one is significantly larger. My 07 CRF250r used to run at like a billion degrees but now it runs smoother and cooler. Buy this it's worth it.

West Virginia
Works great and super easy to install!

Received my order in time for a weekend of trail riding in which this supercooler shines! Very easy to install..10 mins max! Does what it says. The impeller has larger fins to move coolant more rapidly. Great add-on if your bike gets hot!

Verified Purchaser
Billings, MT, USA
Cooler running

I ride and race enduros and my bike runs a lot cooler and doesn't boil over anymore

Verified Purchaser
Super easy install!

Threw the Boysesen super on my yzf250 last week. Install was super easy and it looks great on my bike. Contrary to other reviews my kit came with a gasket. I would have given it 5 star except it doesn't look like the picture. Although mine was for an 02 yzf250. Newer models may differ. Motorsport rocks!! Customer for life!!

Verified Purchaser
Livermore, CA, USA
Easy install

I'm not a mechanic,but, with the ease and simplicity of the destructions, the super cooler went on without any problems!!! Haven't been ride'n yet but it sure looks cool and hopefully will keep my bike just as cool...

Minneapolis, MN, USA
Awesome and looks sweet

The water pump and impeller installed super easy on my 08 Honda 250F, it was about a 5 minute job and I also went with engine ice for coolant, bike seems happier now and running cooler, so I am set for tight single track woods riding where overheating for me was more of an issue.

New Cambria, MO 63558, USA

I bought the super cooler for my 2004 yfz 450 that has been bored to a 478. The bigger bore has made it run a lot hotter but thanks to the supercooler, my yfz stays at a much lower temp now! Again, GREAT PRODUCT!!!!

2004 yfz 478 big bore!
Top 1000 Contributor Verified Purchaser
Looks good

I installed on an 08 honda crf250r. It is very easy to install and it does look a little bigger than the stock one. I gave it 3 stars because of cost, it didn't come with a new gasket, and I cant tell that much of a difference but it does look good.

Top 500 Contributor

I bought this after having over heating problems at the snowshoe GNCC. Bike ran cool in the 100 degree temps at the John Penton after the install!

Top 1000 Contributor

just installed the hot rods stroker kit in my 04 honda 450r, running on 112 octane this thing brought my temps way down! amazing would buy it again!!

Top 500 Contributor
El Cajon, Ca
Worked as expected

I do a lot of desert riding (Glamis) and my engine temps would get a little high after hard riding out in the dunes, but after I installed this I did notice a decrease in temp. The impeller is noticably larger and no issues to date. This was placed on a 2009 yz450f. I will be getting this for the next bike I own, what ever it may be.

Top 500 Contributor
san jose, ca
A must have

If you're tough on your bike and you do alot of single track and race offroad, this is a must have product. Bought this a couple of years ago for my Honda crf450r cause I had a couple of boil-overs. Ever since I bought this product, I haven't had any problems with over heating my bike. A great product, easy to install and looks great.

California city, CA
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
Super supercooler

this product is amazing my 04 yfz 450 runs so much cooler for being in the desert. I can't wait to get one on my wifes bike.

Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

This product is awsome easy install and bike runs much cooler thanks

See 6 More Reviews
23 Questions
Answered:   21
Not Yet:   2
Q: Will this fit and work for a 2017 yz 125 2 stroke?
7 days 13 hours ago
Cover designs also look like they change with the the color I’d like a blue one but looks diffrent than the cover that’s on my bike will it still fit or no
Top 50 Contributor Top 250 Contributor
4 days 7 hours ago
A: This will fit your bike, and you do have the blue one available to you. The photo pictured is for reference and may not be an exact look to what is the proper fitment for your bike.
Location: Newark, OH, USA
Q: I have a 2009 ktm xcf so I’m not sure this will fit. I typed in the bike info and it said that the product does not fit my bike? Any advice?
14 days ago
Top 1000 Contributor
2 days 11 hours ago
A: I'm sorry we do not have this part available for your specific year and make.
Q: Does this kit include the seals and bearings?
15 days ago
Location: Louisiana
Q: Hey will this boyesten supercooler water pump work with a hot rods water pump repair kit??
3 months 2 days ago
I have a 07' crf250r . Please answer back so I can get this bike back to beast mode
Top 10 Contributor
3 months ago
A: Yes it will.
Q: Will this pump fit on my 2008 YFZ 450 SE?
1 year 2 months ago
My YFZ is bored over and is running a little warm. I need something to help cool her down, I've heard this helps I just wanna make sure it's gonna fit. And last is there anything else I could get to help it run cooler?
Q: What kind of seal do I have to use with this?
1 year 5 months ago
MotoSport Staff Expert
1 year 5 months ago
A: Works with the stock gasket. Stock gaskets can be found in our OEM section here:


Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Location: California, USA
Q: In what color does this come for 2015 rmz 250?
1 year 6 months ago
Expert MotoSport Staff
1 year 6 months ago
A: This would be the black Boyesen Supercooler Water Pump Kit.
Q: Does it come with a new gasket for the outer case?
1 year 6 months ago
MotoSport Staff Expert
1 year 6 months ago
A: No. Gasket(s) is NOT included; use stock piece(s) or purchase new one separately.
Location: Illinois, USA
Q: Will this impeller fit on the OEM shaft or do i need to order a new shaft?
1 year 8 months ago
Expert MotoSport Staff
1 year 7 months ago
A: Fits the stock shaft.
Location: Indiana
Q: 2016 YZ250F?
2 years ago
They dont make one to fit the 2016 YZ250F???
MotoSport Staff Expert
2 years ago
A: Yes Boyesen does offer the Boyesen Supercooler Water Pump Kit for the YZ250F 2014-2016. If it is available through one of our suppliers, we would be happy to order it for you. Please contact one of our sales professionals to inquire about special orders and availability.
Dirt Bike: 1-888-676-8853
1-10 of 23
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See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Black N/A
Blue N/A
Magnesium N/A
Red N/A
White N/A
Black WPK-07B
Black WPK-07AB
Black WPK-06B
Black WPK-06AB
Black WPK-17B
Black WPK-18B
Black WPK-27B
Black WPK-26B
Black WPK-26AB
Black WPK-08B
Black WPK-37B
Black WPK-38B
Black WPK-38AB
Black WPK-01B
Black WPK-08AB
Black WPK-09B
Black WPK-10B
Black WPK-12AB
Black WPK-24B
Black WPK-31AB
Black WPK-32AB
Black WPK-37AB
Black WPK-38CB
Black WPK-44B
Black WPK-45B
Black WPK-80B
Silver WPK-17
Silver WPK-18
Silver WPK-27
Silver WPK-26
Silver WPK-37
Silver WPK-24
Silver WPK-28
Silver WPK-31
Magnesium WPK-17M
Magnesium WPK-18M
Magnesium WPK-27M
Magnesium WPK-26M
Magnesium WPK-24-M
Magnesium WPK-31AM
Magnesium WPK-32AM
Magnesium WPK-37AM
Magnesium WPK-38CM
Magnesium WPK-44M
Magnesium WPK-45M
Blue WPK-31AL
White WPK-31AW
Orange WPK-44O
Orange WPK-45O
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