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I know this is an old thread, but it's one of the first hits that comes up on a Google search for "KLX250S oil filter", so I wanted to add some data. The Fram CH6015 part crosses over to a Napa PS4944. I just installed that part in my 2009 KLX250SF and it fits and matches the OEM filter perfectly.
Napa's web site lists the 7932 for the KX250F, which takes a very different filter than the KLX250S (at least the 09 and up).