KTM 690 Duke 2017 Owner's Manual page 170

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 death.
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Always make sure there is sufficient ventilation when running the engine.
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Use an effective exhaust extraction system when starting or running the
engine in an enclosed space.
–
Start the engine and check that it is oil-tight.
Finishing work
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Check the engine oil level. (
1 with the O-ring.
p. 162)
168