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03 YZ 250 Power valve housing

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Quick question, I did the top end on my bike recently, and in washing the bike yesterday I noticed that the small rubber seal for the bottem of the housing (part #5CU-11995-00-00) isn't sealing completely, its fitting kind of loose and pulling away just a little. Is this a common item that needs to be replaced when doing a top end? It was in great shape when I took everything apart so I'm not sure why it is not sealing correctly? Just curious if this is common... I'm assuming it is a problem as it looks like dirt or water may be able to get through.

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