24K doesnt justify a valve job, specially if bike runs well
What is the color of the plug? is it black with oil? Does the engine smoke after it's really warm?
most likely it's the valve seal at the top of the guide, but even then not worth messing with.
The primary carb works a bit more, so the that valve gets a bit more washed with gasoline, so its cleaner.
Some oil in the airbox is normal but check your oil consumption in Liters vs. Km.
Learn from the manual how to check the oil in an XT, it's a bit special procedure
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