2000-2005 Yamaha F40B Outboard Service Manual, Page 254Get this manual

2000-2005 Yamaha F40B Outboard Service Manual, Page 254

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IPOWRI '-'II
Piston-to-cylinder clearance 0.0350.065 mm (0.00140.0026 in)

CHECKING THE PISTON PIN
Measure: Piston pin diameter Out of specification Piston pin diameter 15.9651