The Kawasaki GPz750 Turbo was a sportbike manufactured
from 1983 to 1985.
Although carrying GPz badges on the engine
covers, it was only referred to by Kawasaki
as the "750 Turbo" - the GPz tag wasn't
mentioned. Development started in January 1981
as a turbocharged 650, then as a 750 from November
1981. When finally released, the stock bike
made a claimed 112 hp, had sports bike handling
(for the day) and looked good - especially next
to the other factory turbo bikes which were
already on the market - the Suzuki XN85, Honda
CX500 and CX650 turbos, and the Yamaha Seca
Turbo. Performance was on a par with the GPz1100,
at around 11.2 secs at 125 mph for the quarter
mile and 148 mph flat out. One magazine even
branded it the fastest bike they had ever tested,
and Kawasaki ran some ads claiming it to be
"The Fastest Production Motorcycle in the
World". Jay "PeeWee" Gleason
also recorded a 10.71 quarter for Kawasaki to
show that the turbo had genuine performance
and was ahead of the other factory turbos. It
is widely considered to be the "best"
factory turbo produced by the Japanese manufacturers.
It is widely perceived that the Kawasaki turbo
was simply the addition of fuel injection and
a turbocharger to a standard GPz750 motorcycle
engine. This is far from the case, as almost
every component was changed or strengthened
for this bike and almost no major parts are
Another part of the mystique of this motorcycle
is the hidden "race mode" inside the
fuel computer. The bikes were factory restricted
by means of an over boost cutout which operated
at above 12 psi of turbo pressure. The computer
can be switched back into "race mode"
by a simple rearrangement of wiring to the fuel
computer plug and this removes the 12 psi boost
limit and allows a coarse adjustment of fuelling
to suit higher flowing exhausts. This is borne
up in some official Kawasaki documents reprinted
at 750turbo.com detailing the fitment of an
intake scoop and free flow exhaust along with
the modification for racing use.
All 750 Turbo fuel computers support race
mode, although its existence in US model computers
has been denied (primarily it is alleged to
avoid falling foul of EPA legislation), and
it can be identified by the code "33"
emitted from the computer diagnostic led on
the front of the unit under the seat hump which
is the only code that does not also light the
DFI warning on the tank display.