Yamaha 25BMH 30HMH Factory Service Manual, Page 249Get this manual
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POWR Standard Diamtre "D" 72,00-72,02 mm d'alsage de (2,8346-2,8354 in) cylindre Limite de conicit "T" Limite d'ovalisation "R"
72,00-72,02 mm (2,8346-2,8354 in)
DMaximum D1, D2, D3