KTM 125 SX 2021 Owner's Manual page 110

15 COOLING SYSTEM
108
–
Mount radiator cap
Danger
Danger of poisoning Exhaust gases are toxic and inhal-
ing them may result in unconsciousness and death.
–
Always make sure there is sufficient ventilation
when running the engine.
–
Use effective exhaust extraction when starting or
running the engine in an enclosed space.
S04253-10
–
Allow the engine to warm up and cool down again.
–
Check the cooling system for leaks.
–
Check the coolant level. (
2
.
p. 104)