I am amazed also with the longevity of Gas Gas. My 97 EC250 has close to the same hours yours did and I can still see the cross hatching marks in the jug. My KX250 went thru 2 top ends in that time.
Heck, you might just have it honed for good measure while you have it apart. You just as very well might get another 400+ out of it!
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