KTM 640 LC4 ENDURO - Manual (Page 35)

ENGLISH
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Exchanging the brake light and tail light bulb
Remove the cap 1 on the underside of the license plate retainer.
Turn the lamp socket 2 approximately 30° counterclockwise and pull it out
of the tail light housing.
Slightly depress the bulb, turn it approx. 30° counterclockwise and pull it
out of the socket.
To mount the lamp reverse the worksteps indicated above.
NOTE: Since the bulb on the tail end is subjected to higher vibrations,
heavy-duty bulbs are available from your KTM dealer.
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 (184°F), the fan
3 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 !
T HE RED TEMPERATURE WARNING LAMP FOR THE COOLING LIQUID
4
WILL BEGIN TO
BLINK WHEN THE COOLING LIQUID HAS REACHED APPROX . 120°C (246°F), EXCEEDING
THE NORMAL OPERATING TEMPERATURE .
P OSSIBLE CAUSES :
– S LOW RIDING WITH LARGE LOADS AT A HIGHER AIR TEMPERATURE :
I F POSSIBLE INCREASE YOUR RUNNING SPEED , SO THAT MORE AIR CAN BLOW
THROUGH THE RADIATORS . S HOULD THE WARNING LIGHT STILL BE ON OFF AFTER
300 METERS , STOP IMMEDIATELY , SWITCH OFF THE ENGINE AND LOOK FOR OTHER
POSSIBLE CAUSES .
– T OO LITTLE COOLING LIQUID IN THE SYSTEM :
L ET THE ENGINE COOL DOWN , AND CHECK THE SYSTEM FOR LEAKAGE ’ S . A LSO
EXAMINE THE COOLING LIQUID LEVEL CAUTION SCALDING HAZARD! D O NOT
DRIVE ON , UNTIL THERE IS SUFFICIENT LIQUID IN THE COOLING SYSTEM . G O TO YOUR
NEAREST KTM GARAGE AND GET IT SEEN TO . I F YOU DRIVE WITH THE COOLING
LIQUID TEMPERATURE WARNING LIGHT ON , YOU WILL CAUSE EVEN MORE DAMAGES
TO THE ENGINE .
– T HE COOLING FAN ON THE LEFT COOLER IS NOT WORKING :
T HE COOLING FAN MUST BE RUNNING , WHEN THE COOLING LIQUID TEMPERATURE IS
100°C (210°F) AND THE IGNITION IS ON . I F THE FAN IS NOT WORKING , AND THERE
APPEARS TO BE SUFFICIENT COOLING LIQUID , THE ONLY THING YOU CAN DO IS TO
DRIVE ON TO YOUR NEAREST KTM GARAGE AT THE LEAST POSSIBLE ENGINE LOAD .
– C ONTINUOUS USE OF THE CLUTCH ( RIDING THE CLUTCH ) AT LOWER SPEEDS .
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 corrosion
protection which is why it must not be replaced by pure water.
! CAUTION !
F OR THE COOLING SYSTEM , USE ONLY HIGH - GRADE ANTIFREEZER (M OTOREX A NTI -
F REEZE ). 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
5 ; a water temperature rising up to
125°C (255°F) is admissible, without fear of problems.
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