1987-2004 Kawasaki Mojave KSF250 Service Manual, Page 71Get this manual
ENGINE TOP END Cross Section of Piston Rings
Cylinder Inside Diameter Measurement
eSince there is difference 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 figureIf any of the cylinder inside diameter measurements exceeds the service limit, the cylinder will have to be bored to oversize and then honedCylinder Inside Diameter Measurement
ePosition each piston ring so that the opening in the top ring and oil ring expander faces forwards, and the second ring opening faces the rearThe openings of the oil ring steel rails must be about 30 '" 90 of angle from the opening of the top ring or the expanderCylinder Inside Diameter Piston Ring OpeningsViewed from Front Standard: