Honda BF135A, BF150A Outboard Motors Shop Manual., Page 132Get this manual
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BF135ABF150A dCOMPONENTS DRAWING
[6] flUSH PLUG CAP
[7] 17 mm SPECIAL BOLT (11)
[13] WATER CHECK GROMMET
[10] 10 mm RIVET SCREW (2)
[11] UNDER COVER