10 mm
1
2
3
Cooling system
The water pump in the engine ensures a forced circulation of the cooling
liquid. When the engine is cold, the cooling liquid only circulates in the
cylinders and cylinder heads. After the engine reaches the operating tempe-
rature (approx. 70°C), the thermostat opens and the cooling liquid is also
pumped through the two aluminum radiators.
Cooling is by means of the air stream. The lower the speed, the lower the
cooling effect. Soiled cooling fins also impair the cooling effect.
If, for example, slow urban traffic or waiting at a traffic light cause little or
no air to stream through the radiator, the temperature of the cooling liquid
will rise. The fan
1
in the left radiator switches on when the cooling liquid
reaches a temperature of 98°C. Additional air is blown through the radiator
to prevent the cooling system from overheating.
!
CAUTION
!
T
HE RED COOLING LIQUID TEMPERATURE WARNING LAMP
2
WILL LIGHT UP WHEN THE
COOLING LIQUID REACHES A TEMPERATURE OF APPROX
. 105° C,
HAVING EXCEEDED THE
NORMAL OPERATING TEMPERATURE
.
P
OSSIBLE CAUSES
:
– D
RIVING TOO SLOWLY AND DRIVING WITH A HEAVY LOAD AT HIGH AIR TEMPERATURES
:
I
NCREASE YOUR DRIVING SPEED IF POSSIBLE TO ALLOW WIND TO COOL THE RADIA
-
TOR
. I
F THE CONDITION DOES NOT IMPROVE AFTER
300
METERS
,
STOP IMMEDIA
-
TELY
,
SWITCH OFF THE ENGINE AND CHECK FOR OTHER CAUSES
.
– N
OT ENOUGH COOLING LIQUID IN THE SYSTEM
:
L
ET THE ENGINE COOL DOWN AND CHECK THE SYSTEM FOR LEAKS
. A
LSO CHECK THE
COOLING LIQUID LEVEL
-
CAREFUL - RISK OF SCALDING
! O
NLY CONTINUE TO
DRIVE IF THERE IS ENOUGH COOLING LIQUID IN THE SYSTEM
. C
ONTACT AN AUTHORI
-
ZED
KTM
WORKSHOP AS SOON AS POSSIBLE TO HAVE THE ERROR ELIMINATED
. Y
OU
WILL DAMAGE THE ENGINE IF YOU CONTINUE TO DRIVE WHEN THE COOLING LIQUID
TEMPERATURE WARNING LAMP IS ON
!
– T
HE FAN IN THE LEFT RADIATOR IS NOT RUNNING
:
T
HE FAN SHOULD RUN FROM A COOLING LIQUID TEMPERATURE OF
105°C
WHENE
-
VER THE ENGINE IS RUNNING
. I
F THE FAN IS NOT RUNNING AND YOU HAVE ENOUGH
COOLING LIQUID
,
YOU CAN CONTINUE TO DRIVE TO THE NEAREST AUTHORIZED
KTM
WORKSHOP
,
KEEPING THE ENGINE LOAD TO A MINIMUM
.
WARNING
C
HECK THE COOLING LIQUID LEVEL WHEN THE ENGINE IS COLD
. I
F YOU NEED TO
REMOVE THE RADIATOR CAP WHEN THE ENGINE IS HOT
,
COVER THE CAP WITH A CLOTH
AND OPEN SLOWLY TO ALLOW EXCESS PRESSURE TO ESCAPE
.
Use a mixture of 40% antifreeze and 60% water for the cooling liquid. The
antifreeze should be designed for temperatures of at least -25°C (-13°F).
This mixture offers frost protection as well as good corrosion protection and
should not be replaced by water alone.
!
CAUTION
!
O
NLY USE PREMIUM
-
GRADE
,
BRAND
-
NAME ANTIFREEZE FOR THE COOLING SYSTEM
(MOTOREX ANTI- FREEZE). L
OW
-
GRADE ANTIFREEZE MAY CAUSE CORROSION AND
FOAMING
.
The pressure in the cooling system is controlled by a valve in the radiator
cap
3
; the cooling liquid temperature can reach up to 120° C without
being likely to cause malfunctioning.
Checking the cooling liquid level
The cooling liquid reach approx. 10 mm over the cooling fins (see drawing)
when the engine is cold. If the cooling liquid was just drained, fill the coo-
ling system and replenish with the engine running.
WARNING
C
HECK THE COOLING LIQUID LEVEL WHEN THE ENGINE IS COLD
. I
F YOU NEED TO
REMOVE THE RADIATOR CAP WHEN THE ENGINE IS HOT
,
COVER THE CAP WITH A CLOTH
AND OPEN SLOWLY TO ALLOW EXCESS PRESSURE TO ESCAPE
.
when the engine is cold
35
