2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 31Get this manual
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SPEC Item Cylinder Bore size
mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in)
62.95062.965 (2.47832.4789) 3.5 (0.14) 0.0350.065 (0.00140.0026) 16.0041