1991+ Kawasaki 650 SC Factory Service Manual, Page 72Get this manual
5-8 ENGINE TOP END
Cylinder Wear Inspection
Inspect the inside of the cylinder for scratches and abnormal wearIt the cylinder is damaged or badly worn, replace it with new one.Since there is in cylinder wear in different directions, take side-to-side and front-to-back measurement at each of the locations (total of measurements) shown in the figure