7. CYLINDER/PISTON DOWNTOWN 125i SERVICE INFORMATION GENERAL INSTRUCTIONS · When installing the cylinder, use a new cylinder gasket and make sure that the dowel pins are correctly installed. · After disassembly, clean the removed parts and dry them with compressed air before inspection. SPECIFICATIONS Unit: mm Item Standard 52.452.41 I.D. Warpage Cylinder Cylindricity True roundness Ring-to-groove Top 0.0150.055 clearance Second 0.0150.055 Top 0.100..25 Ring end gap Second 0.100..25 Oil side rail 0.20.7 Piston, 52.3752.39 Piston O.D. piston ring Piston O.D. measuring position 9 mm from bottom of skirt Piston-to-cylinder clearance 0.010.04 Piston pin hole I.D. 15.00215.008 Piston pin O.D 14.99415 Piston-to-piston pin clearance 0.0020.014 Connecting rod small end I.D. bore 15.01615.034 7-2