Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 385Get this manual
OUTBOARD MOTOR INSTALLATION NOTE: For secure and safe sailing, install the outboard motor on the transom of the boat properlyImproperly install outboard motor result in the displaced outboard motor, lack of speed and stability, and poor fuel economyIn addition, the boat does not drive straight unless the outboard motor is installed properlyInstall the outboard motor that conforms to the boat manufacturer's recommended horsepowerNever install an outboard motor which exceeds the recommended maximum horsepower of the boatMAXIMUM HORSEPOWER: BF8D: 8.0 HP BF9.9DIBFlOD: 9.9 HP Install the outboard motor so that it is perpendicular to the water surface (i.eaxis of the propeller is parallel with the bottom of the boat surface)When the transom angle is less thanthe outboard motor might not be perpendicular with the water surfaceInstall the outboard motor on the center of the transom securelyBe sure that the boat is well-balancedThe BF8DlBF9.9DIBFlOD outboard motor can be installed on the transom which board thickness is in the range from 3557 mm (1.3- 2.2 in)