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20
WATER PUMP, COOLING SYSTEM
244
20. 1
Cooling system
A
H01756-10
Water pump
0
in the
engine circu lates the coolant.
The water flow
through
the
radiator is
controlled as a
function
of
the
coolant temper-
ature. The coo ling system
is divided into two
circuits. In the warming-up phase of
the
engine,
the
coolant
flows
through
the
sma
ll
cooling circuit.
Th
is
heats
up
the engine
quickly. The thermostat
8
warms
up
and opens the opening
to the radiator
(large
cooling circuit).
Thi
s
keeps
the
engine temperature constant.
The
pressure
resulting from
the warming of the cooling
system is regulated
by
a
va lve
in
radiator cap
fD
.
This
ensures that operating the vehicle at the
specified coolant
tem perature
wil
l
not result
in a
risk
of malfunctions.
11
20
o
c
(248
°F)
Cooling is effected by
the
air
stream
.
The lower the
speed,
the
less
the
cooling effect.
Dirty
cooling fins also
reduce the
cool-
ing
effect.
The
radiator
fan provides extra cooling.
It
is
control
led
by
a thermoswitch.
Checking the antifreeze and coolant level
Danger of scalding
During motorcycle operation,
the
coolant gets
very
hot and
is under
pressure
.
Do not open
the
radiator, the
radiator
hoses
or other
cooling
system components
if
the
engine or
the
coo
ling system are at
operating
temperature
.
Allow
the
cooling system and
the
engine to coo
l
down
before
you open
the
radiator,
the
radiator hoses
or other components
of the cooling system.
In
the event
of
scaldi
ng,
rinse the
area affected
immediately
with lukewarm water.
Warning
Danger of poisoning
Coolant
is
toxic
and a
health hazard
.
Keep
coolant
out of
the reach
of children.
Do not al low coolant
to
come
into
contact with
the skin
,
the
eyes and cloth
ing.
Consult a doctor immediately
if
coolant
is swallowed
.
Rinse
the
affected area
immediately
with plenty of water in
the
event of
contact
with the skin.
Rinse
eyes thoroughly
with water and
consult
a doctor
immediately
if coolant gets
into the
eyes.
Change
c
lothing
if coolant
spi
lls onto your
clothing.
400243-10
Condition
The
engine is cold.
Stand
the motorcycle upright
on a horizontal surface.
Remove
the
radiator
cap.
Check the antifreeze in the coolant.
1-25 ...
-
45
o
c
(-1
3 ...
-
49 °F)
If
the
antifreeze in
the
coolant
does
not match the specified
va lue:
Correct
the
antifreeze
in the
coolant.
Check the
coo
lant
level
in
the
radiator
.
Coolant
level
f)
above
the radiator
fins
10
mm
(0.39
in)
»
If
the
coolant
level
does
not match
the
specified
value:
Correct
the
coolant level.
I
Coolant
ce
p. 356)
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