Yamaha 25BMH 30HMH Factory Service Manual, Page 248Get this manual
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CRANKSHAFT AND CYLINDER BODY
DMaximum D1, D2, D3, D4, D5 or D6 axi(Maximum D1 or D2) (Minimum D5 or D6) axiax))D6 )
A: 15 mm (0.59 in) below the cylinder top B: 25 mm (0.98 i