KTM RC 125 2019 Owner's Manual page 188

16 COOLING SYSTEM
186
–
Stand the motorcycle upright on a horizontal surface.
–
Check the coolant level in the compensating tank
The coolant level must be between MIN and MAX.
» If there is no coolant in the compensating tank:
–
Check the cooling system for leaks.
V00668-10
–
Fill/bleed the cooling system.
» If the coolant in the compensating tank is not at the
required level, but the tank is not empty:
–
Correct the coolant level in the compensating tank.
( p. 190)
Info
Do not start up the motorcycle!
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p. 193)