6. CYLINDER HEAD/CYLINDER/PISTON SUPER 9 50 The cylinder has an A mark or no mark on it. When replacing the cylinder with a new one, use a cylinder having the same mark as the old one. A Mark Measure the piston O.D. at a point 5mm from the bottom of the piston skirt. Service Limit: SH10DA: 38.90mm replace if below SF10DA: 38.90mm replace if below Measure the piston-to-cylinder clearance. Service Limit: SH10DA: 0.10mm replace if over SF10DA: 0.10mm replace if over Measure the piston pin hole I.D. Service Limit: SH10DA: 12.03mm replace if over SF10DA: 12.03mm replace if over Measure the piston pin O.D. Service Limit: SH10DA: 11.98mm replace if below SF10DA: 11.98mm replace if below Measure the piston-to-piston pin clearance. Service Limit: SH10DA: 0.03mm replace if over SF10DA: 0.03mm replace if over 6-8