KTM 450 SX ATV Owner's Manual page 150

MAINTENANCE ON CHASSIS AND ENGINE
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Remove screws
301843-10
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Pull oil filter element
Circlip pliers reverse (51012011000)
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Completely drain the engine oil.
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Thoroughly clean parts and sealing area.
301844-11
. Take off the oil filter cover with the O-ring.
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out of the oil filter case.
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148