What Ray said, the cylinder has transfer, inlet and exhaust ports so re sleeving can't be done - its construction is a bored aluminium cylinder with a thin nikasil plating that is extremely hard.
First thing to do is to remove the aluminium transfer from the bore and then inspect for bad scores, especially above the exhaust port as this is where the engine makes compression. Don't be put off if t looks a little bad as one MS260 I had looked bad to me and made 190psi and has spent 6 months in the field, hard use still running well.
The OEM cylinder will be made far better than a Chinese aftermarket one - if you can salvage the cylinder - I have salvaged 95% I have had in, then you may have to fit the OEM piston but it will bring the cost down significantly!
Personally I always vac and pressure check an engine after doing this work and re tach the carb but that is my choice and protects the owner from having the same issue almost immediately.