WHAT IS IT? The Boyesen Spectra Supercooler is a
special, limited-edition version of the standard Boyesen
Supercooler high-flow water pump. Spectra colors are red,
blue or white, while the standard Supercooler is offered
in black, silver or magnesium. There is also an orange
Supercooler for KTMs only.
WHAT’S IT COST? $195.95 (Spectra), $189.95 (standard),
$189.95 (KTM orange).
CONTACT? www.boyesen.com or (800) 441-1177.
WHAT STANDS OUT? Here’s a list of things that stand
out with the Boyesen Spectra Supercooler water pump
(1) Difference. Much as with titanium and stainless
steel exhaust pipes, there is no mechanical difference
between the design and performance of a standard
Boyesen Supercooler and the Spectra Supercooler, save for
the colors. Boyesen also offers Spectra clutch covers in the
( 2) Color choices. The marketing appeal of the
Spectra line of Supercoolers is that you can get Honda,
Yamaha, Suzuki and Kawasaki water pumps in red, blue
or white. This means that you could have a red water
pump on a Yamaha, a blue water pump on a Honda or a
white water pump on any of the brands. Given that the
standard-issue Boyesen Supercoolers are offered in black,
silver and magnesium, a consumer can choose from any
of six colors. The only exceptions to this rule are the KTM
pumps. There are no red, blue or white options for KTMs,
although there are black, silver, magnesium and orange
( 3) Heat. Four-strokes run hot, very hot—much hotter
than a comparable two-stroke engine. Since horsepower is
a byproduct of the heat generated internally, the ability to
control runaway temperatures allows the engine to
produce maximum power over the long run. The
Boyesen Supercooler can reduce engine temperatures by
as much as 10 degrees, as confirmed by tests at Team
Kawasaki. How does the Supercooler lower engine
temperatures? 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. 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.
( 4) Plumbing. Stock water pumps aren’t very
hydrodynamic. Their internal shape and impeller
create excessive air bubbles in the water. Air bubbles,
created by cavitation, hamper not only water flow but
the amount of water per cubic gallon pumped. 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. Unlike the stocker, Boyesen’s water inlet
has an increasing diameter, artfully curved shape and
no 90-degree bends.
( 5) Impeller. Boyesen’s larger impeller design is 25
percent more efficient at moving water than the stocker.
WHAT’S THE SQUAWK? No complaints.
This is a serious product for a rider who races
long motos, rides in sand, slogs through
mud or gets bogged down at low speeds.
If you are a three-laps-and-a-cloud-of-dust
rider, you can skip it.
BOYESEN SPECTRA SUPERCOOLER
MXA TEAM TESTED