Boyesen Supercooler Water Pump Kit

$189.99 - $219.99
$170.99 - $197.99
4.80 out of 5 stars
Fitment Expert:
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Boyesen Supercooler Water Pump Kit
Boyesen Supercooler Water Pump Kit
  • Description
  • Reviews (17)
  • Q&A (13)
  • Fitment

Heat Is the #1 Enemy of 4-Stroke Engine Performance

Boyesen SuperCooler Water Pump Cover and Impeller Kits are specifically designed to enhance the performance of your engine's cooling system. These high-flow, hydrodynamic water pump kits have been tested and designed to flow more coolant. By increasing the flow, the engine will run cooler at a more constant temperature.

The Boyesen Supercooler can reduce engine temperatures by as much as ten degrees, as confirmed by tests at Team Kawasaki. How does the Supercooler achieve this? Hydrodynamics. Boyesen's investment-cast aluminum water pump cover has bigger water inlets, a sculpted design, no casting seams, less restrictive corners, a more efficient impeller and less cavitation.

Win the War on Heat, Bolt on a SuperCooler NOW!

  • 2-piece cast aluminum construction.
  • Oil filter access for hassle-free filter changes.
  • Increased coolant flow at all RPM ranges.
  • Patented Nautilus style impeller for hydrodynamic efficiency.
  • Note: Gasket(s) is NOT included; use stock piece(s) or purchase new one separately.

Feature details:

  • Casting: By casting a totally new water pump cover, Boyesen was able to maximize the flow through the unit. Boyesen's design takes advantage of everything from Bernoulli's Effect to biological studies.
  • Superior Internal Hydrodynamic Shaping: Stock water pumps aren't very hydrodynamic. Their internal shape and impeller create excessive amounts of air bubbles in the water. Air bubbles lessen not only water flow, but the amount of water per cubic gallon. Boyesen's Nautilus-shaped cover and impeller increase pump capacity.
  • Optimized Water Inlet Diameter (High Cooling Capactiy): Unlike the stocker, Boyesen's water inlet has an increasing diameter and artfully curved shape. This is a vast improvement over most stock inlets, which decrease in diameter as they near the impeller and have a 90-degree bend at the pump (a very serious hydrodynamic no-no).
  • Optimized Impeller (Patented Nautilus-Style Impeller): Boyesen's patented impeller design is 25 percent more efficient at moving water than the inefficient stocker.
4.8 out of 5 stars (17)
4.8 out of 5 stars
5 star   17
4 star   1
3 star   1
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1-10 of 17
Overall 4 out of 5 stars
Verified Purchaser
Location: Canby
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!!

Overall 5 out of 5 stars
Verified Purchaser
Location: 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...

Overall 5 out of 5 stars
Location: 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.

Overall 5 out of 5 stars
Location: 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!
Overall 3 out of 5 stars
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.

Overall 5 out of 5 stars
Top 500 Contributor
Location: salem,wv

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!

Overall 5 out of 5 stars
Top 1000 Contributor
Location: IL

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!!

Overall 5 out of 5 stars
Top 500 Contributor
Location: 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.

Overall 5 out of 5 stars
Top 500 Contributor Top 1000 Contributor
Location: 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.

Overall 5 out of 5 stars
Ease of Installation
Location: California city, CA
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.

1-10 of 17
Total Questions (13)
Questions with answers:
Questions without answers:
tomas Location: Maryl Street, Burlington, WI 53105, USA
1-10 of 13
Zach 23 days ago
Will this fit my 04 crf 450 with a power bomb exhaust?
Will this fit my bike with that exhaust because it's very close too the pump
Expert MotoSport Staff
20 days ago
The Boyesen SuperCooler Kit for your CRF450R (WPK-06B) is about the same size as the stock water pump cover. If the stock water pump cover fits with an FMF powerbomb, the Boyesen SuperCooler Kit will fit. We are not aware of any fitment problems.
tomas Over 10 months ago Location: Maryl Street, Burlington, WI 53105, USA
What color will this be for an 06 crf 250r?
MotoSport Staff Expert
Over 10 months ago
It would be a black cover (WPK-07B) for your 2006 Honda CRF250R.
JohnBoy 1 year 1 month ago
Twin Air oil filter cap?
will the Twin Air oil filter cap work with this water pump?
Top 1 Contributor Expert MotoSport Staff
1 year 1 month ago
No, the Twin Air Oil Filter Cap will not work with the Boyesen Supercooler Water Pump Kit.
billy 1 year 2 months ago Location: australia
Will this fit my 2014 yz450f?
MotoSport Staff Expert Top 1 Contributor
1 year 2 months ago
Unfortunately, at this time Boyesen do not have a Boyesen SuperCooler Kit available to fit the 2014 Yamaha YZ450F. The ’10-’13 YZ450F Boyesen SuperCooler Kit will not fit the 2014 year model. Boyesen does not have a release date yet for this new item.
Motoxair 1 year 8 months ago Location: Louisiana, USA
Can this water pump handle the pressure if I use a 2.0 bar radiator cap on my 2011 Suzuki RMZ450?
Expert MotoSport Staff
1 year 7 months ago Location: Portland, OR, USA
Yes, You should be fine running this waterpump with a higher pressure radiator cap. I personally used this pump with a 2.0 cap on a Suzuki RMZ250 and had no issues with the pump at all.
Armando 1 year 8 months ago
Is there a color option?
Is there a color option; if not is this in black? for 2008 yfz450
MotoSport Staff Expert
1 year 8 months ago Location: Portland, OR, USA
For the 2008 Yamaha YFZ450 we only offer this cover in the Black Anodized color.
tyler 1 year 11 months ago
Will the stock gasket that is made for the oem water pump work with this water pump or is there a specific one for this pump?
MotoSport Staff
1 year 11 months ago
According to Boyesen, this water pump cover uses the OEM gasket.
Top 1000 Contributor
cole 2 years ago Location: tennessee
Whats the actual color of this?
ive seen black, bronze, some black/grey spotted thing, and this pic looks grey. theres no dropbox to choose a color, so is it as pictured or do colors change from bike to bike or what?
MotoSport Staff
2 years ago Location: Portland, OR, USA
For your 2003 CRF450R this would be a black water pump cover.
ridge 2 years 4 months ago
Will the one made for the yz426f fit a yz400f?
MotoSport Staff
2 years 4 months ago Location: Portland, OR, USA
Unfortunately the kit from the YZ426F will not fit the YZ400F. It appears that Boyesen is not making a kit for the YZ400F either.
CRF250x Over 5 years ago Location: Devils Lake, ND
Water Pump impeller?
How do you hold the engine from spinning so you can take the stock impeller off? Do you hold it the same way to put the aftermarket one on? Should you replace all the seals and gaskets now that you have it apart? Is one 64 ounce jug of engine ice enough coolant with the flushing of the system?
MotoSport Staff Expert
Over 5 years ago Location: Portland, OR
please refer to your service manual when disassembling and advice on how to remove the impeller. I unfortunately can not advise you on how to work on your bike. If your seals were not leaking before, you might be ok just re-using them. But that would be entirely up to you. 64oz of Engine Ice will be more than enough to flush the coolant system.
Over 5 years ago
First off, I'm not a mechanic. But I held the impeller with a padded pipe wrench and took off the center bolt. It came off no problem. I have a 2004 WR450 and put mine on a few years ago.
2 years 1 month ago Location: Minneapolis, MN, USA
You can either use an air impact tool or put bike in gear and hold rear brake while you try to remove. Also make sure you are removing the stock impeller clockwise as it has reverse threads. The new replacement installs easily and you can get it tight enough using the same method of holding brake, do not use air impact to install new one. Depending on the age of your bike and if gaskets/seal should be ok to be reused. 1 container of Engine Ice will do the trick, just flush old coolant out with water and drain real good before filling back up with new Engine Ice.
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