Honda BF9.9A-BF15A Outboard Motors Shop Manual., Page 123Get this manual

Honda BF9.9A-BF15A Outboard Motors Shop Manual., Page 123

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HONDA BF9.SA-BF15A
[2] WHEN CRANK ANGLE IS 180' The inertia force on the piston is 100 downwardThe remaining 50 imbalance, which was counteracted by the inertia force on the crank weight, will b