2004-2009 Suzuki LT-Z250 Service Manual, Page 74Get this manual
CYLINDER
CYLINDER DISTORTION Check the gasket surface of the cylinder for distortion with straightedge and the thickness gauge, taking clearance reading at several places as indicatedIf any clearance reading exceeds the service limit, replace the cylinder with new one Cylinder distortion Service Limit: 0.05 mm (0.002 in)09900-20803: Thickness gauge CYLINDER BORE Inspect the cylinder wall for any scratches, nicks or other damageMeasure the cylinder bore diameter at six places Cylinder bore Service Limit: 66.090 mm (2.6020 in)09900-20508: Cylinder gauge set