Boyesen Supercooler Water Pump Cover and Impeller Kit

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Rating 4.80 of 5 (15 Reviews)

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Product Information

Boyesen Supercooler Water Pump Cover and Impeller Kit

Heat is the #1 enemy of 4-stroke engine performance, win the war on heat bolt on a Boyesen supercooler now.

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. Most MXA test riders feel that both the Suzuki RM-Z and Kawasaki KX-F offer marginal cooling efficiency. 
 
Features:

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.
  • Item # 8215
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  • Mfr. Part #

FitmentView All

Honda Models

  • CRF150R : 2007–2010, 2012–2016
  • CRF150R Expert : 2007–2009, 2012–2016
  • CRF250R : 2004–2015
  • CRF250X : 2004–2009, 2012–2013, 2015
  • CRF450R : 2002–2015
  • TRX450R : 2004–2005

Husaberg Models

  • FE250 : 2014
  • FE350 : 2013–2014

Husqvarna Models

  • FC 250 : 2014
  • FC 450 : 2014–2015
  • FE 250 : 2014
  • FE 450 : 2014
  • FE 501 : 2014–2015

Kawasaki Models

  • KLX450R : 2008–2009
  • KX250F : 2004–2014
  • KX250F Monster Energy : 2009
  • KX450F : 2006–2015
  • KX450F Monster Energy : 2009

KTM Models

  • 250 SX-F : 2013–2015
  • 250 XC-F : 2013–2015
  • 350 EXC-F : 2012–2014
  • 350 SX-F : 2011–2014
  • 350 XC-F : 2011–2014
  • 450 SX-F : 2013–2015
  • 450 SX-F Factory Edition : 2013
  • 450 XC-F : 2013–2015
  • 450 XC-W : 2013–2015
  • 500 EXC : 2012–2015

Suzuki Models

  • RM-Z250 : 2004–2006
  • RM-Z450 : 2005–2015
  • RM-Z450 Carmichael Rep. : 2007

Yamaha Models

  • WR250F : 2001–2009, 2011–2013, 2015
  • WR400F : 2000
  • WR426F : 2001–2002
  • WR450F : 2003–2009, 2011–2013
  • YFZ450 : 2004–2007
  • YZ125 : 2005–2016
  • YZ250F : 2001–2015
  • YZ250F Anniv. : 2006
  • YZ250FX : 2015
  • YZ426F : 2000–2002
  • YZ450F : 2003–2015
  • YZ450F Anniv. : 2006

Product Reviews 1 - 15 of 15

Overall Rating: 4.80 of 5

(15 Reviews)
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What Other Riders Are Saying...

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Works Great

Put this on my YZ 450 and noticed an instant change. Ride mostly trails in the Utah mountains and could not stop over heating the bike due to the steep and slow moving trails. This pump stopped any and all issues over heating, definitely worth the investment.

cody - November 4, 2015

(SLC, UT)

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Well done

First impression after a high speed high rpm race weekend, the thing works wonders. I was roughly 20 degrees cooler than before. Some may be attributed to the higher speeds as well so I'll have to get it out on a tighter mx track and some woods to check it out. Only knocked a star off the finish because it doesn't come in silver to match the rest of the engine.

cujo826 - August 18, 2015

(ocala, FL)

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Yz450

Nice fit and finish but not tested yet due to Pa winter. Was disappointed it wasn't a complete kit. For the price I expected the seals and gaskets needed to install it. Next time I'll read the fine print.

Geeb - April 9, 2015

(Reading , PA)

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Supercooler

Purchased for 2007 yz450f, very nice part, impeller is quite a bit different than stock, so is the housing. Will definitely move more coolant. Installed super easy, you have to re use the rubber o-ring type gasket from the stock water pump so be careful removing the old one. I haven't yet ridden the bike on a hot day since so I can't say how much cooler it will run. Nice looking and looks to be a very functional upgrade.

Jeff - February 21, 2013

(BC, BC)

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Boysen Water Pump

I installed this water pump on my 2007 RM 450 due to over heating issues and it keeps the engine nice and cool now. Money well spent!!! Easy to install took me 10 minutes.

Philip - January 10, 2013

(Louisville, KY)

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boyesen supercooler water pump

a great product it looks great on my bike it pops. and i love its performance i can feel the temperature difference with my legs just from riding it worth the money

garret - October 26, 2012

(grand junction, CO)

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GREAT

I have a 04 kx250f with a athena big bore. This supercooler is awsome. I have not once overheated yet. Only thing is be careful screwing the 3 bolts in doing your oil changes because the threads inside strip very very easily and if your changing your oil like you should your constantly taking it off and putting it back on so it wears out. So im thinking on trying the pro circuit pump because its cheaper and i have pro circuit everything on my bike all ready.

greg - March 13, 2012

(enfield , CT)

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NO MORE OVERHEATING!

I have an 04 KX250f that was overheating when I raced. A friend told me at a race to get this product; we put it on and it hasn't overheated since! I would recommend this product to anyone!

Nik - September 27, 2011

(St. Louis, MO)

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water pump

bought for my yz450. do trail riding and sometimes with young ones. no longer overheat while waiting at difficult sections. would recommend this pump

jerry p - July 11, 2011

(mechanicsville, MD)

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Great product

Man I love this thing. No more emptying the antifreeze to change the oil filter. My bike has actually quit overheating which seems to be a problem on the K4 RMZ-250.

Mike - November 1, 2010

(Southport, FL)

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WATER PUMP

NO OVER HEATING PROBLEMS WITH HONDA 450R, EVEN WHEN GOING SLOW WITH THE LITTLE ONES, USED THE ENGINE ICE STUFF TO, GOOD STUFF.

HOWIE - May 4, 2010

(KINGSTON, GA)

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Boysen Water Pump

I put this on my 06 KX450. The install couldn't have been any easier. I do a lot of track riding, so keeping the motor cool is key. I have external temp strips on the motor and radiator. They're both reading in excess of 10 degrees cooler. This part has immediate and long term benefits. Cooler operating temps = more HP & increases your engines longevity. A must have for anyone that can’t just cruise your bike. Also you won’t find it cheaper anywhere else.

Justin - February 22, 2010

(Sacramento, CA)

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Byesen Supercooler

I had a bad over heating problem which made my bike run like crap. Installed this little guy and can't get it to overheat. Great mod and totally worth the money for real!

garrett - October 9, 2009

(Bel Air, MD)

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Good Product

Boyesen impeller is much bigger than the stock one. The Water Pump is a sexy edition, get it in Black. Bit pricey for keeping ur bike cooler. Wouldn't buy unless ur gonna race. Ride On

Matt Guenther - July 2, 2008

(Green Bay, WI)

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Boyesen Hy-Flo Impeller kit

I have A 2004 CRF450 that runs really hot at low RPM.I have done allot of research and found that the Boyesen HY-FLO WATER PUMP COVER AND IMPELLER KIT.Is the way to go. For high or low RPM's. Not only does it keep it cool but gives A lot more power.

David Verhoek - August 9, 2007

(DANVILLE, FL)