Honda BF135A, BF150A Outboard Motors Shop Manual., Page 118Get this manual
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BF135A-BF150A aBest tension check using belt tension gauge:
10.6-11.1 mm (0.420.44 in) 10.110.6 mm (0.400.42 in)
[2] When pushed with 98 (10 kgf, 22 Ibf) of force
2) If