KTM 1998 400 R, Owner'S Handbook Manual

Page: 27 / 42

ENGLISH
25
Cooling system
Coolant is circulated by a water pump located in the engine. When the
engine is cold the cooling liquid circulates only through the cylinder and
the cylinder head. After the engine has reached its operating temperature
(about 70°C, 158°F), the thermostat opens and the cooling liquid is also
pumped through both aluminum radiators.
Air blowing in through the radiators cools the cooling liquid. The slower
the speed of the motorcycle, the less the cooling liquid is cooled down.
Dirty radiator fins also reduce the cooling efficiency.
If little or no air blows through the radiators, for example when riding
through slow traffic or waiting at traffic lights, the coolant temperature will
rise. If the coolant temperature rises to 85° C (185° F), the fan
7
on the
left radiator will switch on. This fan will provide additional air circulation
through the radiator thereby preventing the cooling system from overheating.
! CAUTION !
I
F THE RED COOLING LIQUID TEMPERATURE WARNING LAMP
6
LIGHTS UP
,
THIS WILL
MOST LIKELY BE DUE TO A DEFECT IN THE COOLING SYSTEM
. I
N THIS CASE
,
STOP IMME
-
DIATELY AND TURN OFF THE ENGINE
. L
ET THE ENGINE COOL DOWN AND CHECK THE
COOLING SYSTEM FOR LEAKS
. A
LSO CHECK IF THERE IS ENOUGH COOLING LIQUID
.
CAUTION - SCALDING HAZARD! D
O NOT DRIVE ON
,
UNTIL THERE IS SUFFICIENT
LIQUID IN THE COOLING SYSTEM
.
WARNING
I
F POSSIBLE
,
ALWAYS CHECK LEVEL OF COOLING LIQUID WHEN ENGINE IS COLD
. I
F YOU
HAVE TO OPEN THE RADIATOR CAP WHEN ENGINE IS HOT
,
USE A RAG TO COVER THE
CAP AND OPEN SLOWLY TO RELEASE PRESSURE
.
A mixture of 40% antifreezer and 60% water is used as cooling liquid.
How-ever, the anti-freeze protection must be at least -25° C (-13° F).
Aside from antifreezing protection, this mixture also provides great corro-
sion protection which is why it must not be replaced by pure water.
! CAUTION !
F
OR THE COOLING SYSTEM
,
USE ONLY HIGH
-
GRADE ANTIFREEZER
(S
HELL
A
DVANCE
C
OOLANT
). U
SING LOWERGRADE ANTIFREEZE AGENTS
,
CAN CAUSE CORROSION AND
COOLANT FOAMING
.
Pressure induced by heating of the cooling liquid in the cooling system is
controlled by a valve in the radiator cap
8
; a water temperature rising up
to 120° C (248° F) is admissible, without fear of problems.
Checking the cooling liquid level
The cooling liquid should be 10 mm (0.4 in) above the cooling elements
when the engine is cold (cf. diagram). In the event of the cooling liquid
being drained, always fill the system before hand, then top off while the
engine is running.
WARNING
I
F POSSIBLE
,
ALWAYS CHECK LEVEL OF COOLING LIQUID WHEN ENGINE IS COLD
. I
F YOU
HAVE TO OPEN THE RADIATOR CAP WHEN ENGINE IS HOT
,
USE A RAG TO COVER THE
CAP AND OPEN SLOWLY TO RELEASE PRESSURE
.
when engine is cold
10 mm
6
7
8