KTM 65 SX Owner's Manual page 71

MAINTENANCE WORK ON THE ENGINE
Danger
Danger of poisoning Exhaust gases are poisonous and inhaling them may
result in unconsciousness and/or death.
–
When running the engine, always make sure there is sufficient ventila-
tion, and do not start or run the engine in an enclosed space without an
effective exhaust extraction system.
–
Start the engine and check that it is oil-tight.
69