KTM 390 DUKE 2021 Owner's Manual page 207

–
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 cap
coolant level up to the MAX marking.
–
Mount the cap of the compensating tank.
F00855-12
Finishing work
–
Fit the front spoiler. (
4
of the compensating tank and top up the
p. 136)
COOLING SYSTEM 16
205