Honda BF135A, BF150A Outboard Motors Shop Manual., Page 406Get this manual

Honda BF135A, BF150A Outboard Motors Shop Manual., Page 406

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BF135ABF150A 5) Apply engine oil to the threads and the washer seat of the ten 11 155 mm bolt-washers, and loosely tighten them on the cylinder head assembly
6) Tighten the 11 155 mm bolt-washer