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Is this a CRF1000 or CRF1100? The cylinders are different designs. The CRF1000 has a steel liner bore and the CRF1100 is a hard coated bore similar to Nikasil. The cylinder scouring looks like a typical over heating situation where the piston outgrows the cylinder or a low oil partial seizure. If not under warranty and it is a CRF1000 it can easily be bored if oversize pistons are available. It looks like a .25 mm overbore will clean this up. I have a cylinder boring machine and have bored thousands of motorcycle cylinders over the last 40 years.
 
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