KTM 2011 690 SMC EU Owner's Manual page 132

SERVICE 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 ventilation,
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.
–
Check the engine oil level. ( p. 122)
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