This manual describes the operation
and maintenance of the Honda
BF 75A and BF 90A Outboard
Motors.
All information in this publication is
based on the latest product information available at the time of printing.
Honda Motor Co., Ltd. reserves the
right to make changes at any time
without notice and without incurring
any obligation.
No part of this publication may be
reproduced without written
permission.
This manual should
permanent part of the Outboard
and it must stay with the Outboard
Motor if resold.
be considered a
Motor
SAFETY MESSAGES
Your safety and the safety of others is
very important. We have provided
important safety messages in this
manual and on the outboard motor.
Please read these messages carefully.
A safety message alerts you to poten-
tial hazards that can hurt you and
others. Each safety message is preceded
by a safety alert symbol A and one of
three words: DANGER, WARNING,
or CAUTION.
These mean:
m You WILL be
KILLED or SERIOUSLY HURT
if you don’t follow instructions.
B You CAN be
KILLED or SERIOUSLY HURT
if you don’t follow instructions.
pxfl You CAN be HURT
if you don’t follow instructions.
Each message tells you what the
hazard is, what can happen, and what
can happen, and what you can do to
avoid or reduce injury.
DAMAGE PREVENTION
MESSAGES
You will also see other important
messages that are preceded by the
word NOTICE.’
This word means:
NOTICE ] Your outboard motor
or other property can be damaged
if you don’t follow instructions.
The purpose of these messages is to
help prevent damage to your outboard
motor, other property, or the
environment.
“-
HONDA MOTOR CO., LTD. 1995
ALL RIGHTS RESERVED
1
TYPES OF HONDA BF75A/90A OUTBOARD MOTORS
It may bc necessary to refer to this chart for reference purposes when reading this manual.
TYPE CODE (example)
LRT T=Power Trim /Tilt
Remote
Control Tilt
0 0 0
0 a 0
a ro 0
0 0 0
Power Trim/
R=Remote Control H=Tiller Handle
Tachometer Trimmeter
0 0
0 0
X=Extra Long Shaft L=Long Shaft
2
IDENTIFICATION NUMBERS
LEFT STERN BRACKET
PRODUdT IDENTIFICATION NUMBER
The Product Identification Number is.
stamped on a plate and attached to the
left stern bracket.
Product identification number:
Record the Product Identification
Number (P.I.N.) and the Engine Serial
Number for your reference. Refer to
the Product Identification Number
when ordering parts, and when mak-
ing technical or warranty inquiries
(see page 134).
ENGINE SERIAL NUMBER
The Engine Serial Number is stamped
on the cylinder block in the front of
the engine.
SAFETY LABELS
These labels are in the locations
shown. They warn you of potential
hazards that could seriously injure
you. Read these labels carefully.
SAFETY INFORMATION
For your safety and the safety of others, pay special attention to these precautions.
Operator Responsibility
l
Know how to stop the engine
quickly in case of emergency.
Understand the use of all controls.
l
Do not exceed the boat manufacturer’s power recommendation, and be
sure that the outboard motor is
properly mounted.
l
Never permit anyone to operate the
outboard motor without proper
instruction.
l
Stop the engine immediately if any
one falls overboard.
l
Do not run the engine
while the
boat is near anyone in the water.
l
Attach the emergency stop switch
lanyard securely to the operator.
l
Do not remove the engine cover
while the engine is running.
l
Before operating the outboard
motor, familiarize yourself with all
laws and regulations relating to
boating and the use of outboard
motors.
l
Do not attempt to modify the outboard motor.
l
Always wear PERSONAL
FLOTATION DEVICE (PFD) when
on board.
l
Do not remove any guards, labels,
shields, covers or safety devices;
they are installed for your safety.
Fire and Burn Hazards
Gasoline is extremely flammable, and
gasoline vapor can explode. Use
extreme care when handling gasoline.
l
Remove any portable fuel tank from
the boat for refueling.
l
Refuel in a well-ventilated area
with the engine stopped. Keep
flames and sparks away, and do not
smoke in the area.
1. SAFETY
l
Refuel carefully to avoid spilling
fuel. Avoid overfilling the fuel tank
(there should be no fuel in the filler
neck). After refueling, tighten the
filler cap securely. If any fuel is
spilled, make sure the area is dry
before starting the engine.
2. COMPONENT IDENTIFICATION (TILLER IHANDLE TYPE)
THROTTLE GRIP
ANGLE
ADJUSTING
ROD
ANODE METAL
ENGINE COVER
\
I
OIL LEVEL
DIPSTICK
\
ENGINE OIL
ANTI-VENTILATION
/
ODE METAL
\
EXHAUST PORT
DRAIN BOLT
ACCESS COV
REAR VENT PLUG
A
LNODE METAL
OIL
FILLER CAP
CHOKE KNOB
CONNECTOR
THROTTLE
FRICTION
\
KNOR
IGNITION SWITCH
INSPECTION
C‘EAR OIL DRAIN BOLT
8
SPARE EMERGENCY
STOP SWITCH CLIP
OVERHEAT
;mIDI$TOR
2. COMPONENT IDENTIFICATION (TILLER HANDLE TYPE)
OIL PRESSURE
INDICATOR LIGHT
EMERGENCY
STOP
SWITCH
\
THROTTLE
FRICTION KNOB
/
IGNIiION
SWITCH
I
EMERGENCY
;a?; SWITCH
GEAIi SHIFT
LEVER
\
;gyT%RHTRIMfTILT
2. COMPONENT IDENTIFICATION (REMOTE CONTROL TYPE)
POWER TILT
SWITCH
ENGINE COVER
I
ANODE METAL
\
EEUST
OIL LEVEL
DIPSTICK
COOLING
ENGINE OIL
ENGINE OIL
DRAIN BOLT
ACCESS COVER
ANODE METAL
TRIM TA/B \
CHOKE KNOB
FUEL HOSE
CONNECTOR
EAR VENT PLUG
OIL LEVEL
INSPECTION
PLUG
GEAR OIL DRAIN BOLT
10
2. COMPONENT IDENTIFICATION (REMOTE CONTROL TYPE)
(SIDE-MOUNT REMOTE CONTROL)
;$yT:RHTRIM/TILT
\
SPARE EMERGENCY
STOP SWITCH CLIP
BUZZER H
(INSIDE)
REMOTE CONTROL ’
FRICTION ADJUSTER
/
Q
/
EMERGENCY STOP
SWITCH LANYARD
EMERGENCY STOP
SWITCH CLIP
NEUTRAL
RELEAE
LEVER
OIL PRESSURE
INDICATOR LIGHT
OVERHEAT
INDICATOR LIGHT
/ STOP SWITCH
I
IDLE
(PANEL-MOUNT REMOTE CONTROL)
EMERGENCY
STOP SWITCH B
11
2. COMPONENT IDENTIFICATION (REMOTE CONTROL TYPE)
(SINGLE TOP-MOUNI
REMOTE CONTROL)
~~~T~HTRIM/TILT
I
f
\/-----l
THRO’Ill
BU’ITON
AEw
CONTROL PANEL
(for PANEL/TOP-
MOUNT
SWITCH
type)
POWER TRIM/TILT
SWITCH
(SIMULTANEOUS CO
(DUAL TOP-MOUNT
REMOTE CONTROL)
OIL PRESSURE
INDICATOR LIGHT
- OVERHEAT
INDICATOR LIGHT
/ CHOKE SWITCH
CONTROL LEVER
POWER TRIM/TILT
SWITCH
(RIGHT INDIVIDUAL
ADJUSTMENT)
’ POWER TRIMmILT
SWITCH
nlVlDUAL
12
2. COMPONENT IDENTIFICATION (COMMON)
FUEL TANK (optional equipment)
FUEL
(option
FUEL
F&L L HOSE CONNECTOR
I
PRIMER BULB PRIMER BULB
(female)
FUEL G>AUGE
HOSE CONNECTOR
VENT KNOB
/
METER
TRIM METER
TACHOMETER
(optional equipment)
13
3. CONTROLS (TILLER HANDLE TYPE)
Ignition Switch
IGNITION SWITCH
START ON
Move the gearshift lever to the N
(neutral) position before starting. The
engine will not start unless the
gearshift lever is in the N (neutral)
position.
Gear Shift Lever
GEAR SHIFT LEVER
There are three gearshift lever positions.
F (forward): The boat moves forward.
N (neutral): The transmission gears
are disengaged from the
engine.
R (reverse): The boat reverses.
Choke Knob
CHOKE KNOB
When the engine is cold, pull the
choke knob. A rich fuel mixture is
provided to the engine by pulling the
choke knob.
14
3. CONTROLS
(TILLER HANDLE TYPE)
Throttle Grip
THROTTLE GRIP
Turn the grip clockwise or counterclockwise to adjust the engine speed.
Turning the grip in the direction
shown by the arrow increases engine
speed.
Throttle Opening Indicator
THROTTLE OPENING INDICATOR
The curve on the grip label indicates
throttle opening.
Throttle Friction Knob
THROTTLE FRICTION KNOB
Use the throttle friction knob to set the
throttle grip at a certain position while
cruising. Turning the friction knob
clockwise sets the throttle grip, and it
is released by turning the friction knob
counterclockwise.
15
3. CONTROLS (TILLER HANDLE TYPE)
Emergency Stop Switch
STOF
LANYARD -‘.
The emergency stop switch lanyard is
provided to stop the engine immediately in the event the operator should
fall overboard or away from the controls.
Emergency Stop Switch Lanyard
I
EMERGENCY STOP SWITCH CLIP
The emergency stop switch clip must
be engaged with the emergency stop
switch or the engine will not start.
When the emergency stop switch clip
becomes disengaged with the emergency stop switch, the engine will
stop immediately.
CLIP
EMERGENCY STOi SWITCH LANYARD
Attach the
emergency
stop switch lanyard securely to the operator when
operating the outboard motor.
16
3. CONTROLS (TILLER HANDLE TYPE)
SPARE EMERGENCY
STOP SWITCH CLIP
A spare emergency stop switch clip is
provided near the ignition switch.
Oil Pressure Indicator Light
(GREEN)
OIL PRESSURE INDICATOR LIGHT
The green oil pressure indicator light
is normally ON when the outboard
motor is running.
When the engine oil level is low or the
engine lubrication system is faulty, the
green oil pressure indicator #light turns
OFF and the engine speed decreases
gradually.
Overheat Indicator Light
[-G-J
(RED)
OVER HEAT INDICATOR LIGHT
When there is a cooling system pro-
blem, the red overheat indicator light
turns ON and the engine speed
decreases gradually.
17
3. CONTROLS (TILLER HANDLE TYPE)
Power Trim/Tilt Switch
Power Trim
Press the power trim/tilt switch on the
tiller handle to adjust the motor trim
angle from 0” to 20” to maintain
proper boat trim. The power trim/tilt
switch located on the tiller handle can
be operated while the boat is under
way or while stopped.
By using the power trim/tilt switch
the operator can change the trim
angle of the motor to achieve maximum
boat acceleration, speed, stability and
maintain optimum fuel consumption.
Power Tilt
Press the power trim/tilt switch on the
tiller handle to adjust the motor tilt
angle from 20” to 72”.
By using the power trim/tilt switch the
operator can change the tilt angle of
the motor for shallow water operation,
beaching, launching from a trailer, or
mooring.
POWER
TRIM/TILT
SWITCH
Excessive trim/tilt angle during
operation can cause the propeller
to raise out of the water and cause
propeller ventilation and engine
over-revving. Excessive trim/tilt
angle can also damage the water
pump-
Steering Friction Adjuster
The steering friction adjuster adjusts
the tightness of the steering
movement.
18
(SIDE-MOUNT TYPE)
Remote Control Lever
3. CONTROLS (REMOTE CONTROL TYPE)
OPENING
REMOTE CONTROL LEVER
The remote control lever controls gear
selection and throttle opening posi-
tions.
It is necessary to pull up the neutral
release lever to operate the remote
control lever.
F (forward):
Moving the lever to the F position
(approximately 30” from the N
position) will engage the forward
gear. Moving the lever farther into
the F position will increse the
throttle opening and the boat’s forward speed.
N (neutral):
The engine idles and the transmission gears are disengaged.
R (reverse):
Moving the lever to the R position
(approximately 30” from the N
position) will engage the reverse
gear. Moving the lever farther into
the R position will increase the
throttle opening and the boat’s
reverse speed.
19
3. CONTROLS (REMOTE CONTROL TYPE)
Neutral Release Lever
The neutral release lever is on the
remote control lever to prevent an
accidental gear engagement.
The
remote control lever will not
engage forward or reverse gear, unless
the neutral release lever is pulled up.
Ignition
The remote control box is equipped
with a key-type ignition switch.
Key positions:
START
To activate the starter motor and start
the engine (the remote control lever
must be in the neutral position).
Switch
START
ON
To run the engine after starting (the
battery will discharge if the key
left in this position with the engine
not running).
OFF
To stop the engine (IGNITION
OFF).
To prevent the battery from discharging, keep the key in the
position when the engine is not running.
OFF
is
20
3. CONTROLS (REMOTE CONTROL TYPE)
Emergency Stop Switch Lanyard
The emergency stop switch lanyard is
provided to stop the engine immediately in the event the operator falls
overboard or away from the controls.
The emergency stop switch clip must
be engaged with the emergency stop
switch, or the engine will not start.
When the emergency stop switch clip
becomes disengaged from the emergency stop switch, the engine
will stop immediately.
-7
SWITCH LANYARD
’ The emergency engine stop switch
should not be used to normally stop
the engine. Use the ignition switch to
normally stop the engine.
Attach the emergency stop switch lanyard securely to the operator when
operating the outboard motor.
SPAkE EMERGENCY
STOP SWITCH CLIP
A spare emergency stop switch clip is
provided on the remote control box.
21
3. CONTROLS (REMOTE CONTROL TYPE)
Choke/Fast Idle Lever
N
(neutral)
f-’ CHOKE
/((=j MAXIMUM FAST IDLE
The choke/fast idle lever provides two
functions:
1. Electric choke solenoid activation
for easy engine start up.
2. Engine fast idle.
The choke/fast idle lever will not
move unless the remote control lever
is in the N (neutral) position.
Conversely, the remote control ,lever
will not move unless the choke/fast
idle lever is in the lowest position.
WEST POSITION
ST IDLE LEVER
Raise
the choke/fast idle lever, and
hold it all the way up to provide a
rich fuel mixture and maximum fast
idle.
Gradually lower the choke/fast idle
lever to the lowest position to decrease
the choke and fast idle.
Manual Choke Knob
I /
/
CHOKE KNOB
A
manual choke knob is located on
the right side of the motor, which can
be used in the event the battery is discharged.
and a rich fuel mixture will be provided to the engine.
Pull
the manual choke knob,
22
3. CONTROLS (REMOTE CONTROL TYPE)
Oil Pressure Indicator Light/Buzzer
The green oil pressure indicator light
turns OFF and the buzzer sounds
when the oil level is low and/or the
engine lubrication system is faulty.
The engine speed slows down gradual-
ly*
Overheat Indicator Light/Buzzer
The red overheat indicator light turns
ON and the buzzer sounds when there
is a cooling system problem. The
engine speed slows down gradually.
23
3. CONTROLS (REMOTE CONTROL TYPE)
Power ‘Mm/Tilt Switch
Power Grn
Press the power trim/tilt switch on the
remote control to adjust the
motor trim angle from 0” to 20” to
maintain proper boat trim. The power
trim/tilt switch located on the remote
control lever can be operated while the
boat is under way or while stopped.
By using the power trim/tilt switch,
the operator can change the trim angle
of the motor to achieve maximum
boat acceleration, speed, stability and
maintain optimum fuel consumption.
Power Tilt
Press the power trim/tilt swich on the
remote control lever to adjust the
motor tilt angle from 20” to 72”.
By using the power trim/tilt switch,
the operator can change the tilt angle
of the motor for shallow water operation, beaching, launching from a
trailer, or mooring.
ANGLE
Excessive trim/tilt angle during
operation can cause the propeller
to raise out of the water and cause
propeller ventilation and engine
over-revving. Excessive trim/tilt
angle can also damage the water
pump.
24
(PANEL-MOUNT TYPE)
Remote Control Lever
3. CONTROLS (REMOTE CONTROL TYPE)
The remote control lever controls gear
selection and throttle
tions.
opening posi-
It is necessary to pull’up the neutral
release lever to operate the remote
control lever.
THROTTI
.E OPENING
MAXIMUM -’
REMOTE CONTROL LEVER
F (forward):
Moving the lever to the F position
(approximately 35” from the N
position) will engage the forward
gear. Moving the lever farther into
the F position will increse the
throttle opening and the boat’s for-
ward speed.
N (neutral):
The engine idles and the transmis-
sion gears are disengaged.
THROTTLE
I
R (reverse):
Moving the lever to R position
(approximately 35” from the N
position) will engage the reverse
gear. Moving the lever farther into
the R position will increase the
throttle opening and the boat’s
reverse speed.
OPENING
3. CONTROLS (REMOTE CONTROL TYPE)
Neutral Release Lever
The neutral release lever is on the
remote control lever to prevent an
accidental gear engagement.
The remote control lever will not
engage forward or reverse gear, unless
the neutral release lever is pulled up.
Ignition Switch
START
The switch panel is equipped with a
key-type ignition switch.
Key positions:
START
To activate the starter motor
the engine (the remote control lever
must be in the neutral position).
and start
ON
To run the engine after starting (the
battery will discharge if the key is
left in this position with the engine
not running).
OFF
To stop the engine (IGNITION
OFF).
To prevent the battery from discharging, keep the key in the
position when the engine is not run-
ning.
OFF
26
Emergency Stop Switch Lanyard
EMERGENCY
STOP
SWITCH
The emergency stop switch lanyard is
provided to stop the engine immediately in the event the operetor falls
overboard or away from the controls.
3. CONTROLS (REMOTE CONTROL TYPE)
\
EMERGEkCY STOP SWITCH ’
LANYARD
The emergency engine stop switch
should not he used to normally stop
the engine. Use the ignition switch to
normally stop the engine.
SPARE EMERGENCY
STOP SWITCH CLIP
A spare emargency switch clip is
provided in the tool bag.
The emergency stop switch clip must
be engaged with the emergency stop
switch, or the engine will not start.
When the emergency stop switch clip
becomes disengaged from the emergency stop switch, the engine will
stop immediately.
Attach the emergency stop switch lanyard securely to the operator when
operating the outboard motor.
27
3. CONTROLS (REMOTE CONTROL TYPE)
Throttle Button
(NC&l)
l ..*q;,:ckword
,’
,
NEUTRAL
RELEASE
LEVER
THROTTLE
BUTTON
By moving the control lever forward
or backward when the throttle button
is pushed in, the throttle opening will
be increased without engaging the gears.
It is necessary to position the control
lever in N (neutral) to push in the
throttle button.
Choke Switch
When the engine is cold, put the
choke switch “ON”. A rich fuel
mixture will be provided to the engine.
Manual Choke Knob
CHOKE! KNOB
A manual choke knob is located on
the right side of the motor, which can
be used in the event the battery is discharged. Pull the manual choke knob,
and a rich fuel mixture will be provided to the engine.
28
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