Missing filter cover round o-ring?

In performing the my first oil change on my new to me xr650r it appears that the small round o-ring in the area of the long cover bolt is missing. Also, the diagram in the owner's manual apparently shows a dowel at this location? I completed the oil change without replacing the small round o-ring and dowel.

How critical is this?

The o-ring that follows the perimeter of the filter cover is in good condition and there are no leaks.

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It turns out that no parts are missing from the diagram you provided or from the photo in the factory shop manual that I recently aquired!

Curiously, the owners manual diagram DOES distinctly show a small (1/4" diamter or less) o-ring and what appears to be a dowel at the oil supply hole inside right side/front of the filter cover. I'm not sure why the owners manual shows something different, but I do trust the factory shop manual with its black&white photographs more.

I wish I could attach an image from the owners manual to show that I'm not crazy by seeing what appears to be a missing o-ring!

Here's the only relevant bit I can see in the manual..Don't know which part you mean but if it's all fine carry on..

filterbc.jpg

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Edited by Horri

The small format owners manual that comes with the bike with green cover printing distinctly shows a small round o-ring in addition to the large perimeter o-ring. I have the same black and white photos in my factory shop manual that do not show it and I trust that more. I will have to scan and post the diagram from the owners manual for all to understand what I am seeing.

Mark

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