Yamaha 25BMH 30HMH Factory Service Manual, Page 250Get this manual

Yamaha 25BMH 30HMH Factory Service Manual, Page 250

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CRANKSHAFT AND CYLINDER BODY
ver di Over size piston diameter: 844 1: 72.25 mm (2.8445 in) 7272854 2: 72.50 mm (2.8543 in)

NOTE: When measuring the piston diameter, position the mic