2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 142Get this manual
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Cylinder block Piston diameter a: 62.95062.965 mm (2.47832.4789 in) Measuring point b: 3.5 mm (0.14 in) up from the bottom of the piston skirt Oversize piston diameter: Oversize 1st: 63.20063.215 mm (