2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 288Get this manual

2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 288

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TECHNICAL FEATURES AND DESCRIPTIONS 1POWER HEAD
Pin center

Diameter measurement point: 3.5 mm (0.138 in)

Off set: 0.5 mm (0.02 in)

Fig 2 Piston