What year? My '00 did that. On the pre '02 transmissions, there were plain bearings on several gears that were later updated to needle bearings. Sometimes, like on a fast road, this bearing interface would actually bind and screech for several seconds at a time, almost like a partial seizure. As the bike got more hours on it it stopped. I rebuilt the motor after two years, looked at every part in detail. Nothing was obviously wrong, just highly polished surfaces of these bearing areas. That '00 XC250 is owned by member bucksnbikes and still runs fine to this day with no issues. My '03 and '07 never made a sound.
The newer trans parts drop right in, and if I remember add up to around $250.
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