The best replacement for cr250 is yz250.

The best alternatives to cr250 are rated as following:
★★★★★  yz250
★★★★  crf250
★★★★  cr250r
★★★★  crf450
★★★  cr500
★★★  cr125
★★★  kx250
★★  crf450r
★  rm250
★  ktm 300
★  ktm 250
★  yz450f
★  xr400
  250sx
  cr250

Your alternative for cr250 is not listed? Suggest!
Speaking about cr250, one probably shouldn't forget about flywheel weight.

Other search terms related to cr250 and their ratings are:
★★★★★ flywheel weight
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cr250
yz250
crf250