This manual describes the operation
and maintenance of the Honda
BF35A/45A 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 be considered a
permanent part of the Outboard Motor
and it must stay with the Outboard
Motor if resold.
READ THIS OWNER’S MANUAL
CAREFULLY. Pay special attention to
these symbols and any instructions
that follow.
B
injury or death WILL result if
instructions are not followed.
B Indicates a strong
possibility that serious injury or
death may result if instructions
are not followed.
w Indicates a possibil-
ity that minor injury could result
if instructions are not followed.
[NOTICEI
or property damage could result if
instructions are not followed.
Indicates serious
Indicates that equipment
Honda Outboard Motors are designed
to give safe and dependable service if
operated according to instructions.
Operating this Outboard Motor
requires special effort on your part to
ensure your safety and the safety of
others.
-
or misuse may cause iijury or
property damage. Read and
understand this owner’s manual
before operating the Outboard
Motor.
If a problem should arise, or if you
have any questions about your
Outboard Motor, see an authorized
Honda Marine dealer.
HONDA MOTOR CO., LTD. 1990,
ALL RIGHTS RESERVED
Careless oneration
1
TYPES OF HONDA BF3§A/45A OUTBOARD MOTORS
It may be necessary to refer_tcthis chart for reference purposes when reading this manual
Model
BF35
BF45
S: Short Shaft
The gas assisted tilt type motors use a gas damper to assist when manually tilting the motor.
The power trim/tilt type motors use an electric/hydraulic power cylinder to trim or tilt the motor.
L: Long Shaft X: Extra Long Shaft
H: Tiller Handle R: Remote Control T: Power Trim/Tilt
2
IDENTIFICATION NUMBERS
PRODUCT IDENTIFICATION NUMBER
Record the Product Identification
Number (RLN.) and the Engine Serial
Number for your reference. Refer to
the Product Identification Number
when ordering parts, and when making technical or warranty inquiries
(see page 99).
STARTER MOTOR
ENGINE~SERIAL NUMBER
The Product Identification Number is.
stamped on a plate and attached to the
right stem bracket. The Engine Serial
Number is stamped on the cylinder
block under the starter motor which is
located in the front of the engine.
These labels are in the locations
shown. They warn you of potentia1
hazards that could seriously injure
you. Read these labels carefully.
EXTREMELY
DANGER
FLAMMABLE
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 motor while the
boat is near anyone in the water.
l
Attach the emergency stop switch
lanyard securely to the operator.
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 the 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.
I. 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.
7
2. COMPONENT IDENTIFICATION (TILLER HANDLE TYPE)
THROTTLE GRIP
HANDLE
ldiir-7
o
Mi
w v
0
THdT
1
LOCK
STERN
BRACKET
WASH PLUG
(Flush plug)
GEAR OIL DRAIN PLUG
8
I
&l l/l
I
COOLING
ACCESS COVER
ANTI-VENTILATION c
D, ATE-
‘RIM TAB
Y...-.-..YL . u
I
PROPEL1 --
XR
LEVER
=r
THROTTLE
_____- ~~~
FRICTION KNOB
ENGINE START
WATER INTAKE
on, PReS\SURE INDICATOR LIGHT
OVERHEAT
\
INDICATOR
LIGHT
M
CHOKE KNOB
EMERGENCY
STOP SWITCH
CLIP
/ I
SPARE EMERGENCY
STOP SWITCH CLIP
EMERGENCY
STOP SWITCH
LANYARD
ENGINE
STOP
“.l”-..CH
\
\
ENGINE
COVER
FUEL LINE
CONNECTOR
\ SWI;rCH
STEERING
2. COMPONENT IDENTIFICATION (REMOTE CONTROL TYPE)
POWER TILT
I I
OIL FILLER CAP
CHOKE KNOB
I
POWER TRIM/TILT
SWITCH
\
\ - /
NEUTRAL
RELEASE LEVER
V
OIL PRESSURE
INDICATOR
TRANSOM
ANGLE
MANUA<
RELIEF VALVE
GEAR OIL
LEVEL PLUG
/
GEAR
DRAIN PLUG
\
PROPELLER
\
COOLING
INDICATOR
ENGINE OIL ’
ACCESS COVER
ETAL)
HAUST PORT
/e-r In!
- \
- STERN
BRACKET
SPARE EMERGENCY
~BNTHATION
__ .-- r
hAIN
WA”“” .rwn. .,m
/
EMERGENCY STOP
SWITCH LANYARD
CHOKE/FAST
/
/
IDLE LEVER
-/ EMERGENCY
ENGINE
SWITCH
STOP
I
EMERGENCY STOP
SWITCH CLIP
9
2. COMPONENT IDENTIFICATION
FUEL GAUGE
POWER TRIM/TILT TYPES
VENT KNOB
/
10
I
PRIMER BULB
HOSE CONNECTOR
FiJEL
(FEMALE)
FUEL CAP
TACHOMETER
TRIM METER
3. CONTROLS (TILLER HANDLE TYPE)
Engine Start Button
R
(reverse)
EN&NE START
BUTTON
N
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.
Shift Lever
R
(reverse)
SHIti LEVER
N
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
CHOKk KNOB
When the engine is cold, pull the
choke knob. A rich fuel mixture is
provided to the engine by pulling the
choke knob.
11
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 OIPENING INDICATOR
The curve on the grip indicates throttle
opening.
Throttle Friction Knob
RELEASE
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.
12
3. CONTROLS (TILLER HANDLE TYPE)
Engine Stop Switch
ENGINE STOP StiTCH
Push the engine stop switch to stop the
engine.
Emergency Stop Switch Lanyard
EMERGENCY STOP SWITCH CLIP
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.
The emergency stop switch clip must
be engaged with the engine stop
switch or the engine will not start.
When the emergency stop switch clip
becomes disengaged with the engine
stop switch the engine will stop imme-
diately.
ENGINE STOP
SWITCH \
EMERGENCY STOP SWITCH LANYARD
Attach the emergency stop switch lanyard securely to the operator when
operating the outboard motor.
13
3. CONTROLS (TILLER HANDLE TYPE)
SPARE EMERGENCY
,STOP SWITCH
CLIP
A spare emergency stop switch clip is
provided near the engine stop switch.
Oil Pressure I’ndicator Light
OIL PRESSURE INDICATOR LIGHT
I I-
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
\
OVERHEAT INDICATOR LIGHT
When the engine cooling system is
faulty, the red overheat indicator light
turns ON and the engine speed
decreases gradually.
14
Remote Control Lever
3. CONTROLS (REMOTE CONTROL TYPE)
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.
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 further from
the F position will increase the
throttle opening and the boat for-
ward 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 further from.
the R position will increase the
throttle opening and the boat
reverse speed.
15
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
The remote control box is equipped
with a key type ignition switch.
Key positions:
START
To activate the starter motor and start
the
engine.
must be in the neutral position)
(the remote control lever
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).
16
Emergency Stop Switch Lanyard
3. CONTROLS (REMOTE CONTROL TYPE)
SPAkE EMERGENCY
SWITCH LANYARD
STOP SWITCH CLIP
The emergency stop switch lanyard is
provided to stop the engine immedi-
ately in the event the operator should
fall overboard or away from the controls.
The emergency stop switch clip must
be engaged with the emergency engine
stop switch or the engine will not start.
When the emergency stop switch clip
becomes disengaged from the emer-
gency engine stop switch the engine
will stop immediately.
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.
A spare emergency stop switch clip is
provided on the remote control box.
17
3. CONTROLS (REMOTE CCDNTROL TYPE)
Choke/Fast Idle Lever
n CHOKE
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.
XIMUM FAST IDLE
OWEST POSITION
CHOKE/FAST
IDLE LEVER
Lift and hold the choke/fast idle lever
up fully, this will provide a rich fuel
mixture and the correct fast idle.
Gradually lower the choke/fast idle
lever to the lowest position to decrease
the choke and fast idle.
Manual Choke Knob
CHOKE tiOB
A manual choke knob is provided 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.
18
3. CONTROLS (REMOTE CONTROL TYPE)
03 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 the
engine cooling system is faulty. The
engine speed slows down gradually.
19
3. CONTROLS (REMOTE.CONTRBL & POWER TRIM/TILT TYPE)
Power ‘Ikim/Tilt Switch (remote
control lever)
Power Ikim
Press the power him/tilt switch on the
remote control lever to adjust the
motor trim angle of 0” to 20” to maintain proper boat trim. The power
him/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 switch on the
remote control lever to adjust the
motor tilt angle of 20” to 60”.
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.
TRIM/TILT
SWITCH
picziq
\ !I I
Excessive trim/tilt angle
during operaUion 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.
XRTA
Power Trim
Do not trim this engine when you are
type outboard
using a large amount of throttle
opening. If you do try lo trim the engine, under certain conditions, propeller thrust may override the power
trim hydraulics and cause the engine
to return to the transom angle adjusting rod. (Full “in” position)
Power Tilt
Press the power tilt switch on the
remote control lever to adjust the
motor tilt angle of 20” to 60”.
By using the power tilt switch the operator can change the tilt angle of the
motor for shallow water operation,
beaching, launching from a trailer, or
mooring.
20
3. CONTROLS (REMOTE CONTROL & POWER TRIM/TILT TYPE)
Power Tilt Switch (motor pan)
POWER TILT SWITCH
The power tilt switch located on the
motor pan is a conveyance switch for
tilting the motor for trailering, or preforming outboard maintenance. This
power tilt switch should only be operated with the boat being stopped and
motor off.
Trim Meter
TRIM METER
The trim meter has a range of 0’ to 20”
and indicates the trim angle of the outboard motor. Refer to the trim meter
when using the power trim/tilt switch
to achieve proper boat performance.
Tachometer
TACHOMETER
The tachometer shows the approximate engine speed in revolutions per
minute. Refer to the tachometer when
using the power trim/tilt switch to
achieve proper boat and motor performance.
21
3. CONTROLS (REMOTE CONTROL & POWER TRIM/TILT TYPE)
Manual Relief Valve
If the power trim/tilt switch will not
tilt the outboard motor, the motor can
be manually tilted up or down by
opening the manual relief valve. To
tilt the outboard motor manually, turn
the manual valve under the left stem
bracket no more than 1 or 2 turns
counterclockwise using a screw driver.
After tilting the motor, turn the manual
relief valve clockwise securely.
The manual relief valve must be tightened securely before operating the
motor or the motor could tilt up when
operating in reverse.
LEFT STERN BRACKET
MANUAL
POWER
MANUAL-RELIEF VALVE
m rel=1
I
Do not turn this ‘screw. If this screw
is turned hydraulic oil will bleed out
of the power trim/tilt system. Should
this happen it will be necessary to
consult your authorized Honda
Marine dealer and have the system
refilled.
Tilt Lever (GAS ASSISTED
TYPE)
Moving the tilt lever to the FREE
position allows the motor to be tilted and moving the tilt lever to the
LOCK position locks the motor in the
desired position. Use the tilt lever to
temporarily tilt the motor when the
boat is operating in shallow water, or
mooring in shallow water. The tilt
lever must be in the LOCK position
before operating the motor or the
motor could tilt up when operating in
reverse.
22
3. CONTROLS & INSTRUMENTS (common)
Tilt Lock Lever
Use the tilt lock lever to hold the
motor in the highest tilt position
when the boat is moored for a long
time.
Tilt the motor up as far as it will go
then move the tilt lock lever into the
lock position and gently lower the
motor.
Trim Tab
PROPELLER
When making a turn, if an unequal
amount of effort is required to turn
the steering wheel or tiller handle
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 straight course at
full throttle. Slightly turn the steering
wheel or tiller handle for both right
and left turns to determine if an equal
amount of effort is required. If adjustment is necessary loosen the tightening bolt and turn the trim tab right or
left. Make small adjustments at a
time and retest. Incorrect trim tab
adjustment can cause adverse steering.
The trim tab also functions as an anode.
23
3. CONTROLS & INSTRUMENTS
(common)
Anode Metal
+I
The anodes are made from a sacrificial
material which helps to protect the
outboard motor from corrosion.
\
ANODi
(stem bracket)
Painting or coating the 1 NoTlCq
anodes will lead to rust and corrosion damage to the outboard motor.
Cooling System Indicator
\
COOiING SYSTEM INDICATOR
The cooling system is monitored here
to make sure cooling water is
ing through the engine.
circulat-
24
Water Intakes
The engine cooling water is drawn
into the water pump through these
water intakes.
3. CONTROLS & INSTRUMENTS (ctimmon)
WATiR INTAKES
25
3. CONTROLS & INSTRUMENTS
(common)
Transom Angle Adjusting Rod
TRANSOM ANGLE ADJUSTING ROD
The transom angle adjusting rod is
used to adjust the motor angle to
achieve the correct boat him. There
are 5 adjustment holes located in the
stem bracket.
Push in and turn the transom angle
adjusting rod up to remove. To install
insert into the proper hole and turn
down to lock. After installation pull
the transom angle adjusting rod outward to be sure it is locked in place.
Start with the transom angle adjusting
rod in the hole closest to the boat tran-
TO CHANGE
TO LOCK
TRANSOM
ADJUSTING ROD
I
+=I
ANGLE
UNLOCKED
POSITION
1
---
.
--/’
J
LOCKED POSITION
som, lower the motor and operate the
boat at full speed. If the bow is excessively low stop the boat. Tilt the motor
up and raise the transom angle adjusting rod one more hole away from the
transom and retest. The optimum boat
trim is when the boat is parallel with
the water.. The transom angle adjusting rod stops the motors forward
movement.
The motor should never be operated
with the transom angle adjusting rod
removed.
26
3. CONTROLS & INSTRUMENTS (common)
Fuel Cap/Gauge/Vent Knob
VENT KNOB
I
GAUGE
The fuel gauge is part of the fuel cap.
The fuel cap vent knob controls air
entering and leaving the fuel tank.
When refilling the fuel tank, turn the
vent knob counterclockwise to the
open position and remove the fuel cap.
Before transporting, storing or refilling the fuel tank inspect the condition
of the fuel cap gasket and replace if
necessary.
FUEL FILLER CAP
Before transporting or storing the fuel
tank turn the vent knob fully clockwise to the closed position.
B Gasoline is
extremely flammable, and gasoline vapor can explode, causing
serious injury or death. Do not
smoke or allow flames or sparks
in your working area. KEEP
OUT OF REACH OF CHILDREN.
Over-Rev Limiter
This outboard motor is equipped with
an engine over-rev limiter which limits
the maximum engine r-pm. This overrev limiter protects the engine from
mechanical damage.
The over-rev limiter may be activated
by putting the propeller in a light load
condition or propeller ventilation.
When the over-rev limiter is activated
the engine rpm will become unstable
or erratic. Should this occur reduce the
throttle opening and wait for the
engine rpm to stabilize then increase
the throttle opening.
On the power
the trim angle
duce the possibility of propeller ventila-
tion.
trim/tilt type motors lower
on high speed turns to re-
27
4. PRE-OPERATION CHECKS
Engine Cover Removal/Installation
(FRONT)
ENGINE COVER
To remove, release the front and rear
engine cover latches and remove the
engine cover.
To install, position the engine cover
over the engine and hook and lpck the
front and rear latches.
(REAR)
28
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