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09 crf450r leaking after oil change?

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I changed the oil on my bike and the drain plug and where the filter goes is leaking it has the new o ring where the filter goes what could be causing this?

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Assuming the spring and oil filter are fully seated? Did you make sure the the oil filter cover was complete flat against the engine case before you began tightening and that you tightened both bolts down equally and torqued properly?  Did you you double check the oil ring for nicks or cuts and you're sure that it somehow didn't get pinched between the case and cover? Lastly, did you give the o ring a light coating of oil before tightening the cover? Those are the things I'd check and consider.

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You pinched the oring pushing the filter cover back in...That cover needs to be rotated when being inserted.

the drain...That can be a couple different reasons. Dirt under the head of the bolt is usually the issue though.

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