Honda BF135A, BF150A Outboard Motors Shop Manual., Page 309Get this manual
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BF135A-BF150A 5) Tighten the two 10 75 mm flange bolts and the three 10 45 mm flange bolts to the specified torque in the numbered sequence in two or three stepsTORQUE: 39 Nem (4.0 kgfem, 29lbfeft)