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2-113 2 NOTE: Make sure the smaller reading is 1.5 mm CYLINDER TRUENESS 1. Measure each cylinder in the three locations from front to back and side to side for a total of six read- ings. FC044 2. The trueness (out-of-roundness) is the difference between the highest and lowest reading. Maxi- mum trueness (out-of-roundness) must not exceed 0.1 mm (0.004 in.). 0725-586 PISTON SKIRT/CYLINDER CLEARANCE 1. Measure each cylinder front to back about 2.5 cm (1 in.) from the bottom of each cylinder. 2. Measure the corresponding piston skirt diameter at a point 1 cm above the piston skirt at a right angle to the piston-pin bore. Subtract this measurement from the measurement in step 1. The difference (clearance) must be within 0.075-0.0105 mm (0.0029-0.0041 in.). AC091 PISTON-RING END GAP 1. Place each piston ring in the wear portion above the exhaust port of its respective cylinder. Use the pis- ton to position each ring squarely in each cylinder. 2. Using a feeler gauge, measure each piston-ring end gap. Acceptable ring end gap must be within 0.30-0.50 mm (0.012-0.0196 in.). FC045 PISTON PIN AND PISTON-PIN BORE 1. Measure the piston pin diameter at each end and in the center. Acceptable piston pin measurement must be within 21.995-22.000 mm (0.8659-0.8661 in.) for the 800 cc or 23.995-24.000 mm (0.9447- 0.9449 in.) for the 1000 cc. If any measurement varies by more than 0.02 mm (0.001 in.), the pis- ton pin and bearing must be replaced as a set. AN056 |