Honda BF135A, BF150A Outboard Motors Shop Manual., Page 362Get this manual
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BF135A-BF150A COMPONENTS DRAWING:
12 Nm (1.2 kgfm, Ibfft) [18] CAM CHAIN TENSIONER
[7] 15 1.9 mm ORING
12 N'm (1.2 kgfm, Ibfft)
[17] TENSIONER PIVOT