8. CYLINDER/PISTON ATV 300/250 SPECIFICATIONS Unit: mm (in) Item Standard Service Limit I.D. 72.70572.715 72.8 (2.912) (2.90822.9086) Cylinder Warpage 0.05 (0.002) Cylindricity 0.05 (0.002) True roundness 0.05 (0.002) Top 0.0150.055 0.09 (0.0036) Ring-to-groove (0.00060.0022) clearance 0.0150.055 Second 0.09 (0.0036) (0.00060.0022) Top 0.150.3 (0.0060.012) 0.5 (0.02) Piston, Ring end gap Second 0.30.45 (0.0120.018) 0.65 (0.026) Piston ring Oil ring 0.20.7 (0.0080.028) 0.9 (0.036) Piston O.D. 72.6772.69 72.6 (2.904) (2.90682.9076) Piston O.D. measuring position 10 mm from bottom of skirt . 0.010.04 Piston-to-cylinder clearance 0.1 (0.004) (0.00040.0016) Piston pin hole I.D. 17.00217.008 17.04 (0.6816) (0.680080.68032) Piston pin O.D 16.99417 16.96 (0.6784) (0.679760.68) Piston-to-piston pin clearance 0.0020.014 0.02 (0.0008) (0.000080.00056) Connecting rod small end I.D. bore 17.01617.034 17.06 (0.6824) (0.680640.68136) 8-3