Honda BF90D User Manual

111
OPERATION
The trim tab is provided to adjust for
“torque steer” which is a reaction of
the propeller rotation or propeller
torque. If during a high speed turn an
unequal amount of effort is required
to turn the boat right or left, adjust the
trim tab so that an equal amount of
effort is required.
Distribute the load evenly in the boat
and run the boat in a straight course at
full throttle. Slightly turn the steering
wheel for both right and left turns to
determine the amount of effort
required.
Remove the gear case grommet and
loosen the tightening bolt to adjust
the trim tab. After adjustment,
reinstall the grommet securely.
If less effort is required to make left
turns:
Loosen the trim tab tightening bolt
and turn the rear end of the trim tab
toward the left. Tighten the bolt
securely.
If less effort is required to make right
turns:
Loosen the trim tab tightening bolt
and turn the rear end of the trim tab
toward the right. Tighten the bolt
securely.
Make small adjustments at a time and
retest. Incorrect trim tab adjustment
can cause adverse steering.
Trim Tab Adjustment
LEFT
RIGHT
TRIM TAB
GEAR CASE GROMMET
GEAR CASE GROMMET
TRIM TAB
TIGHTENING BOLT
TIGHTENING BOLT
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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