Honda BF90D User Manual

50
INSTALLATION
Location
Install the outboard motor at the
stern, at the center line of the boat.
Installation Height
The anticavitation plate of the
outboard motor should be ± 25 mm 
( ± 1 in) below the bottom of the boat.
The correct dimensions differ
according to the type of the boats and
the configuration of the bottom of the
boats. Follow the manufacture’s
recommended installation height.
• The water level must be at least
100 mm (4 in) above the
anticavitation plate, otherwise
the water pump may not receive
sufficient cooling water, and the
engine will overheat.
• Adverse effect to the engine can
occur if the installation position
of the outboard motor is too low.
Trim/tilt down the outboard
motor with the boat fully loaded
and stop the engine. Check that
the idle port is 150 mm (5.9 in) 
or more above the water level.
CENTER LINE
BOAT TRANSOM
HEIGHT
± 25 mm 
( ± 1 in)
ANTICAVITATION
PLATE
TRANSOM
HEIGHT
IDLE PORT
150 mm 
(5.9 in) 
or more
WATER LEVEL
FULLY
TRIM/TILT
DOWN
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Honda BF90D Specifications

General

Bore & Stroke	73 mm x 89.4 mm
Horsepower	90 HP
Cooling System	Water Cooled
Starting System	Electric
Gear Ratio	2.33:1
Trim Range	-4° to +16°
Tilt Range	70°
Dry Weight	163 kg (359 lbs)
Lubrication	Wet Sump
Recommended Fuel	Unleaded Gasoline (86 Octane or higher)
Gear Shift	F-N-R
Steering	Remote
Trim Method	Power Trim and Tilt
Displacement	1496 cc
Exhaust	Through propeller
Alternator Output	44 Amps
Recommended Engine Oil	10W-30 FC-W
Shaft Length	20" or 25"
Engine Type	4-Stroke SOHC, 4 Cylinders
Fuel Delivery	Programmed Fuel Injection