WHAT IS IT? The Boyesen Supercooler is an aftermarket water pump (cover and impeller) that improves water
flow, engine cooling and efficiency. It is used on Ryan
Villopoto’s Kawasaki KX450F.
WHAT’S IT COST? $189.95.
CONTACT? www.boyesen.com or (800) 441-1177.
WHAT STANDS OUT? Here’s a list of things that
stand out with the Boyesen Supercooler water pump and
(1) Function. Boiled down to its essence (pun
intended), the Boyesen Supercooler flows more water
than stock water pumps. Boyesen has been working on
water pumps since 1999 (during the two-stroke era), and
the transition to four-strokes has only made Boyesen’s
effort more important. Four-strokes run hot—very hot.
The Boyesen Supercooler can reduce engine temperatures by as much as 10 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.
( 2) 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.
( 3) Internal shape. Stock water pumps aren’t very hydrodynamic. Their internal shape and impeller create excessive air bubbles in the water. Air bubbles lessen not only
water flow, but the amount of water per cubic gallon. The
Supercooler’s smooth interior surfaces eliminate coolant pinch
points, resulting in a hydrodynamically efficient interior that
increases fluid-flow re-entry rates into your bike’s engine.
( 4) Inlet size. 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 hydrodynamics no-no).
( 5) Impeller. Boyesen’s patented impeller design is 25
percent more efficient at moving water than the inefficient
( 6) Colors. The Supercooler is available with silver,
magnesium, red, blue or black coatings.
WHAT’S THE SQUAWK? No complaints.
If you race four-lap races, this is a three-star
product (fighting heat works best when
you ride long enough to generate heat).
But if you are like Ryan Villopoto, this is a
BOYESEN SUPERCOOLER WATER PUMP
MXA TEAM TESTED