KTM 125 Duke Owner's Manual page 152

15 COOLING SYSTEM
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Start the engine and let it run warm.
–
Stop the engine and allow it to cool down.
–
When the engine is cool, check the coolant level in the radiator and, if necessary, add
coolant.
–
Remove the cap of the compensating tank
up to the MAX mark.
–
Mount the cap of the compensating tank.
–
Fit the front spoiler. (
B00766-11

and add coolant until the coolant level is
p. 95)
150