Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 415Get this manual

Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 415

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PROPELLER INSTALLATION

Install with the groove side facing the gear case as shown
GEAR CASE

SELECTION
Selection of the optimum propeller for boat characteristics