The ZX600 and 750 Fours
F
or a first go, the ZX600A (GPZ600R
in
the UK, Ninja
60DR
in
the
US)
wasn't
bad.
In
fact it was marvelous. Up until
ils
introduction
in 1985,
Kawasaki
had
never made a water-cooled bike. Their air-
cooled ZX models (note the
lower-case
'zed'
in
the UK GPz designation denoting
air cooling. a capital means liquid
cooled) middleweights had ruled the
roost since the start
of
the decade,
advancing
through
the
usual
Kawasaki progression
of
naked
twin-shock bike, naked
monoshocker, then growing a
bikini fairing, a half fairing and a
full fairing in successive years.
The
ZX600A, though. hit the
ground running as a fully-enclosed
water-cooled bike with the full set
of
mid
'80s trickery including a
16-
inch front wheel and suspension
equipped with anti-dive and adjustable air
pressure and damping. Critically, it was a year
ahead of the Honda
CBR600 and
swept
all
before it
in
the
middleweight
sales stakes.
Nevertheless, there were
two
sets
of
modifications; the first was a new set of disc
brakes
for the A4 model of 1988, the second a
major
reworking of engine internals for the A5
of 1989 which increased
power
by
9%
and
peak torque by
13%.
This
didn't
really
do
much for sales as by then the modern 6005
had
arrived.
The
ZX600A's chassis package was all new
but
the
motor was
based
around the old 52.4
mm
stroke of the GPz550 with the bore taken
out
2 mm to 60 mm, another typical piece of
Kawasaki
evolution.
As
was
the
ZX600C
model
(GPX6OQR
in
the UK, Ninja 600R in the
US)
which arrived
in
1988. The engine - at the
bottom end
at
least - was the
same
as the
ZX600A
but up top the drive for inlet efficiency
led
the
valves to
be
operated by short rocker
arms
pivoting
in
ball and pillow mountings as
opposed to the cam
lobes
operating
on
Acknowledgements
O
ur
thanks are due to Kawasaki Motors
(UK)
Ltd
for
permission
to
reproduce
certain illustrations used
In
this
manual.
We would also like to thank the Avon
Rubber
Company,
who
kindly
supplied
Information and technical assistance on tyre
fitting, and NGK
Spark
plugs
(UK)
Ltd
for
information on spark plug maintenance and
electrode conditions.
Thanks are also due
to
the Kawasaki
Information
Service and Kel Edge for
supplying colour transparencies. The main
front
cover
photograph
was
taken
by Phil
Flowers. The Introduction, "Kawasaki -
The
Green Meanies" was written by Julian
Ryder.
buckets
over the
top
of
the
valve stem. The new design allowed
the inlet tracts to be straightened out.
Externally, the
ZX600G was slimmer and a
lot easier on the eyes than the
ZX600A,
although that pearlescent white
paintwork
does
look a lillie
dated
in the late '90s!
Naturally, Kawasaki added loads of lightness,
bring it down a Whopping 25 kg to 180 kg but
didn't go with the trend back to bigger wheals
sean
on
the competition, giving it a 16-incher
at the back
as
well
as
the fronl. It had the full
set of '805 high-tech
but
the electronic anti-
dive system (ESGS) was quietly dropped on
later models. The character of the bikes were
very similar; both needed to be revved and
worked
hard
to
get
the best
out
of
them,
although there is no
doubt
that the ZX600C
doesn't
Just
look more modern, it goes that
way, too.
The
ZX600A
now
looks
like a 50ft all
rounder
but
in its day it was a cutting edge
sportster. The
ZX600C was much harsher
(especially the rear suspension) and
more
About
this
Manual
T
he aim of this manual is to help you gel
the best value from your motorcycle. It
can
do
so
in
several ways. It can help
you decide what
work must be done, even if
you choose
to
have it
done
by
a dealer: it
provides information and procedures
for
routine maintenance and servicing; and It
offers
diagnostic
and repair procedures
to
follow when trouble occurs.
We hope you use the manual to tackle the
work
yourself. For many simpler jobs, doing it
yourself
may
be
quicker
than arranging
an
appointment
to
get the
motorcycle
into
a
dealer
and making the
trips
to leave it and
pick
it up. More importantly, a lot of money
can be
saved by avoiding the expense the
Introduction 0· 7
Kawasaki
ZX600C
focused, but by the
time
it hit the market it had the CBR600 to
deal with.
The
bigger
ZX750F (GPX750R
in
the UK,
Ninja
750R
in
the
US)
had similar problems as
it tried to make up for the
flop
that was the
ZX750G (GPZ750R), only more of them; the
FZ,
VFR
and GSX-R 750s. This time the new
bike wasn't a derivation of a
previous model
as the brand
new
68 x 51.5 mm bore and
stroke show, dimensions which, incidentally,
were carried
over to the ZXR750. Externally it
looked so like the
600 that it was difficult to
know which was which without looking
at
the
decals. The 18-inch rear wheel
on
the 750
was a visual clue, though. It rode like the
smaller bikes, too, with a pronounced
reluctance to
do
anything
In
the low
or
mid-
range followed by a manic rush at the top end.
The chassis seemed to tighten up when you
hit the
power
and
what
seemed like a soft,
gutless bike
in
town turned into a rev hound
when you hit the open road;
all the classic
characteristics of a sporty
KawasakI.
shop must pass on to you to cover Its labour
and
overhead costs.
An
added benefit
is
the
sense of satisfaction
and accomplishment
that you
feal after doing the job yourself.
References
to
the left
or
right side of the
motorcycle
assume you are sitting on the
seat, facing forward.
We
take
great
pride
in
the
accuracy
of
information
given
in
this
manual,
but
motorcycle
manufacturers
make
alterations
and design
changes
during
the
production
run
of a particular
motorcycle
of
which
they
do
not
inform
us. No liability
can
be
accepted
by
the
authors
or
publishers
for
loss,
damage
or
injury
caused
by
any
errors
in,
or
omissions
from,
the
information
given.