16 COOLING SYSTEM 61
16.1 Cooling system
L00564-10
The water pump with a 3D water pump impeller
1
in the engine ensures forced cir-
culation of the coolant. The heat exchanger enables faster warming of the engine oil at
the start of a journey and better heat dissipation for the engine oil during the journey.
The pressure in the cooling system resulting from heat is regulated by a valve in the
radiator cap
2
. The heat expansion causes the surplus coolant to flow into the
coolant overflow reservoir
3
. When the temperature falls, this surplus coolant is
sucked back into the cooling system.
The lower the speed, the less the cooling effect. Dirty cooling fins also reduce the cool-
ing effect.
16.2 Checking the coolant level
Warning
Danger of scalding During motorcycle operation, the coolant gets very hot and is under pressure.
– Do not remove the radiator cap, radiator hoses or other cooling system components when the engine is hot. Allow the
engine and cooling system to cool down. In case of scalding, rinse immediately with lukewarm water.
Condition
The engine is cold.
400243-10
– Stand the motorcycle upright on a horizontal surface.
– Take off the radiator cap.
– Check the coolant level in the radiator.
Coolant level
A
above the radiator
fins.
10 mm (0.39 in)
» If the coolant level does not meet specifications:
– Correct the coolant level.
Distilled water
– Fit the radiator cap.
Info
In most racing series, it is not permissible to use antifreeze, which is why
the cooling system must be filled with distilled water.
If the cooling system is filled with distilled water, it may only be exposed to
temperatures above freezing. If the vehicle will be exposed to temperatures
below freezing during storage or transport, the coolant must be drained.
The standard filling of the vehicle is with a mixture of antifreeze and dis-
tilled water.
16.3 Draining the coolant x
Warning
Danger of scalding During motorcycle operation, the coolant gets very hot and is under pressure.
– Do not remove the radiator cap, radiator hoses or other cooling system components when the engine is hot. Allow the
engine and cooling system to cool down. In case of scalding, rinse immediately with lukewarm water.
Condition
The engine is cold.
Preparatory work
– Remove the engine cowl. ( p. 38)
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