8. CYLINDER/PISTON ATV 150/125 Measure the piston pin O.D. Service Limit: 14.96 mm (0.5984 in) Measure the piston O.D. Take measurement at 5mm from the bottom and 90° to the piston pin hole. Piston O.D. (ATV 150): 61.9 mm (2.476 in) Piston O.D. (ATV 125): 56.4 mm (2.256 in) Measure the piston-to-piston pin clearance. Service Limit: 0.02 mm (0.0008 in) CYLINDER INSPECTION Inspect the cylinder bore for wear or damage. Measure the cylinder I.D. at three levels of top, middle and bottom at 90° to the piston pin (in both X and Y directions). Cylinder I.D.: (ATV 150): 62.1 mm (2.484 in) (ATV 125): 56.6 mm (2.264 in) Measure the cylinder-to-piston clearance. Service Limit: 0.1mm (0.004 in) The true roundness is the difference between the values measured in X and Y directions. The cylindricity (difference between the values measured at the three levels) is subject to the maximum value calculated. Top Service Limits: Middle True Roundness: 0.05 mm (0.002 in) Bottom Cylindricity: 0.05 mm (0.002 in) 8-7