Oil leak - Wr450f 2004

The bike is leaking oil from where the arm connects to the engine case.

I've replaced bolt and O-ring.

Still leaks... Why, and what to do?

Thanks.

ImageUploadedByThumper Talk1457703434.317854.jpg

It looks like from the photo that someone overtighten the bolt.  It looks a little off centered.  There appears to be a small crack on the arm itself.   Maybe replace the enitre oil arm assembly. 

I had this on my '05 after I did a rebuild on it. My problem turned out to be the dowel pin. It was hard to see at first, but the dowel had split from top to bottom. 

Screen Shot 2016-04-06 at 3.13.35 PM.png

Edited by freestyle250

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