Honda BF135A, BF150A Outboard Motors Shop Manual., Page 582Get this manual
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BF135A-BF150A 16) Remove the 25 2.0 mm self-locking nut or 78-14 UNF self-locking nut from the tilting shaftReplace the 25 2.0 mm self-locking nut or 78-14 UNF self-locking nut with new one on assembl