2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 145Get this manual
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Cylinder block Piston diameter a: 93.92193.941 mm (3.69773.6985 in) Measuring point b: mm (0.2 in) up from the bottom of the piston skirt
S69J5B70
a 20 mm (0.8 in) 60 mm (2.4