Help! TTR 90 oil blow by

My son has a 2000 ttr 90 that started smoking like a bug sprayer. I honed the cylinder & replaced the rings. Bike stopped smoking & ran good for about 3 hours of riding. Then it started smoking agian, with no loss of power. Is there something that would cause the rings to wear that fast, or not seat?

valve rod guides?

replaced valve seals, guides did not seam worn.

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