KTM 2016 690 DUKE R Owner's Manual page 167

18 SERVICE WORK ON THE ENGINE
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Mount and tighten oil filler plug
Danger
Danger of poisoning Exhaust gases are toxic 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.
Finishing work
–
Check the engine oil level. (
 with the O-ring.
p. 159)
165