Honda BF135A, BF150A Outboard Motors Shop Manual., Page 358Get this manual
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BF135ABF150A 9) Remove all bolts securing the chain case 10 43 mm flange bolts (3) 38 mm (SH) flange bolt (1) 28 mm flange bolts (10) 31 mm special bolts (2) 25 mm flange bolts (3) [1] 37 (SH BOLT)