KTM 450 XC Owner's Manual page 166

MAINTENANCE ON CHASSIS AND ENGINE
Info
Drain the engine oil only when the engine is warm.
–
Park the vehicle on a horizontal surface.
–
Remove the engine guard. (
–
Place a suitable container under the engine.
–
Remove the oil drain plug
600134-10
–
Remove the plug screw
600135-10
p. 144)
.

and small oil screen with both O-rings.

164