This manual describes the operation
and maintenance of the Honda BF25A
and BF30A 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
KILLED or SERIOUSLY HURT
if you don’t follow instructions.
B YouCAN be
KILLED or SERIOUSLY HURT
if you don’t follow instructions.
if you don’t follow instructions.
1
NOTICE/
or other property can be damaged
if you don’t follow instructions
You WILL be
You CAN be HURT
Your outboard motor
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 injury 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 or Honda Outboard
Motor dealer.
HONDA MOTOR CO., LTD. 1994,
ALL RIGHTS RESERVED
1
TYPES OF HONDA BF25A/30A OUTBOARD MOTORS
It may be necessary to refer to this chart for reference purposes when reading this manual.
(example)
LH S
---
TYPE CODE
I S = Electric Starter
Control
H = Tiller Handle
R = Remote
Shaft Length
(transom height)
S = Short
L = Long
X = Extra Long
2
IDENTIFICATION NUMBERS
RIGHT STERN BRACKET
PRODUCT IDENTIFICATION NUMBER
Record the Product Identification
Number (MN.) 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 98).
STARTER MOTOR
ENGINE
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.
8. STOPPING THE ENGINE
TILLER HANDLE TYPE
REMOTE CONTROL TYPE
9. TRANSPORTING
10. CLEANING AND FLUSHING
11. MAINTENACNE
THE IMPORTANCE OF MAINTENANCE
MAINTENANCE
EMISSION CONTROL SYSTEM INFORMATION..
Tool Kit and Spare Parts
MAINTENANCE SCHEDULE
Engine Oil
Gear Oil
Spark Plugs
Battery
Lubrication
Engine Fuel Filter
Fuel Tank and Filter
Fuse Replacement
Propeller
Submerged Motor
These labels are in the locations
shown. They warn you of potentia1
hazards that could seriously injure
you. Read these labels carefully.
GASOLINE@gg
EXTREMELY
F(RUSEIS*~Or(R-O+“-)(*“-*IHWun,-mrnros
FLAMMABLE
DANGER
FLAMMABLE DANGEROUS
GASOLINE
RMM FROU OatI FOR Fllllffi
I CHECK 011 U”El. BEFORE !ilAUllNR
I RWN TNE S”STEN -“ONL” WITN FRESH WATEK
- EAC” “SE IN SM.1 WA’ICK.
I ;oOl&“V STARTINS lNSlRUClK))(S AKE ON lW Of
6
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
Do not open 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 a 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.
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.
7
2. COMPONENT IDENTIFICATION
(TILLER HANDLE TYPE)
THRoTT\LE GR1P
GEAR OIL DRAIN PLUG
FUEL LINE
C/ONNECTOR
I
EXHAUST PORT
I
PROPELLER
OIL LEVEL DIPSTICK
OIL FILLER CAP
\
INDICATOR
(ANODE METAL)
STARTER GRIP
(Recoil starter
,y-,
FRICTION KNOB
TER INTAKE
OIL PRESSURE INDICATOR I.IC.HT
I
CHOKE KNOB
EMERGENCY
STOP SWITCH
STOP SWITCH
SPAR’E EMERGENCY
STOP SWITCH CLIP
8
2. COMPONENT IDENTIFICATION (REMOTE CONTROL TYPE)
ENGINE COVER
\
\
LEVEL PLUG
I
GEAR OIL
DRAIN PLUG
--- - -----A DIPST i CK
\
EXHAUST PORT
I
I
PROPELLER
OIL FILLER CAP
‘11
COOLING
SYSTEM
INDICATOR
(ANODE METAL)
I
CONTROL
LEVER
CHOKE KNOB
PARE EMERGENCY
TOP SWITCH C
\ IllI
TILT
LEVER
STERN BRACKET
\
WATER INTAKE EMERGENCY STOP
SWITCH LANYARD
I
EMERGENCY STOP
SWITCH CLIP
NEUTRAL
RELEASE LEVER
OIL PRESSURE
, INDICATOR
/
/ LIGHT
CHOKE/FAST
IDLE LEVER
EMERGENCY
ENGINE STOP
I
SWITCH
9
2. COMPONENT IDENTIFICATION
VENT KNOB
FUEL TANK
10
I
PRIMER BULB
FUEL G\AUGE
FiJEL HOSE CONNECTOR
(FEMALE)
/
FUEL CAP
3. CONTROLS (TILLER HANDLE TYPE)
Engine Start Button (Electric Starter
Type)
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.
R
BUTTON
Gearshift 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.
GEARSHIFT
’ ’ LEVER
Choke Knob
CHbKE 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
THRO’I-IXE OPENING 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
PUSH
I
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 from the engine
stop switch the engine will stop immediately.
ENGINE STOP
SWITCH
EMERGENCY STOP SWITCH LANYARD
SPARE EMERGENCY
STOP SWITCH CLIP
Attach the emergency stop switch lanyard securely to the operator when
operating the outboard motor.
A spare emergency stop switch chp is
provided near the engine stop switch.
13
3. CONTROLS (TILLER HANDLE TYPE)
Oil Pressure Indicator Light
\ I
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.
Recoil Starter
Pull the starter grip to start the engine.
Set the gearshift lever in the N (neutral)
position before starting.
The engine will not start unless the
gearshift lever is in the N (neutral)
position.
14
Remote Control Lever
3. CONTROLS (REMOTE CONTROL
THROTTLE OPENI
TYPE)
OPENING
The remote control lever controls gear
selection and throttle opening positions.
It is necessary to pull up the neutral
release lever to operate the remote
control lever.
REMOTE CdNTROL 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 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 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
+ ON START
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)
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 OFF
position when the engine is not running.
16
Emergency Stop Switch Lanyard
EMERGENCY
\
EMERGENCY 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 con-
trols.
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.
KY
3. CONTROLS (REMOTE CONTROL TYPE)
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.
A spare emergency stop switch clip is
provided on the remote control box.
SPAkE EMERGENCY
STOP SWITCH CLIP
17
3. CONTROLS (REMOTE CONTROL TYPE)
Choke/Fast Idle Lever
N (neutral)
v - )E CHOKIQFASTIDLE
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.
MAXIMUM FAST IDLE
LOWEST POSITION
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 KNOB
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)
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.
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 & INSTRUMENTS
kommonj
Tilt Lever
LEVER
Use the tilt lever to temporarily tilt the
motor when the boat is operating or
mooring in shallow water.
Tilt lever in the TILT position:
The lock mechanism between the
motor and stem bracket is unlocked.
The motor can be tilted up to either
the 30°, 45” or 75” tilt position.
Tilt lever in the RUN position:
The lock mechanism between the
motor and stem bracket is locked
when the motor is in contact with the
transom angle adjusting rod.
Trim Tab
TIGHTENING
BOLT \ I m
TRIM TliB
PY-C
PROPEL- ’
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.
CT
. .
\ A/ \
I
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.
20
3. CONTROLS & INSTRUMENTS
(common)
Anode Metal
The anode is made from a sacrificial
material which helps to protect the
outboard motor from corrosion.
INOTICE
Painting or coating the
anode 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 circulating through the engine.
Water Intakes
Water
Intakes
The engine cooling water is drawn
into the water pump through these
water intakes.
21
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 trim. 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-
TRANSOM ANGLE
TO CHANGE
TO LOCK
ADJUSTING ROD
I
-1
LOCKED POSITION
UNLOCKED
POSITION
I
---
.
--1’
I/
som, lower the motor and operate the
boat at full speed. If the bow is excessively low stop the boat and motor. 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.
22
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
nticessary.
FUEL FILLER CAP
Before transporting or storing the fuel
tank turn the vent knob fully clockwise to the closed position.
extremely flammable, and gasoline vapor can explode, causing
serious injury or death. Do not
smoke or allow flames or sparks
in your working
OUT OF REACH OF CHILDREN.
area.
KEEP
Over-Rev Limiter
This outboard motor is equipped with
an engine over-rev limiter which limits
the maximum engine rpm. 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.
23
4. INSTALLATION
Installation
It is your responsibility to choose a
boat suitable for the motor.
DO NOT OVERPOWER THE BOAT
Do not install an outboard motor that
exceeds the recommended maximum
horsepower for the boat. Refer to the
boat certification plate for the maximum recommended horsepower for the
boat. For most boat applications, the
motor should have a horsepower which
provides 80% of the maximum recommended horsepower for the boat. If the
certification plate information is not
available, contact the boat dealer.
The BF25A/30A must be installed on
transoms which have the following
minimum or maximu thickness.
Boat Transom Thickness
Minimum = 1.38 in (35 mm)
Maximum = 2.24 in (57 mm)
STERN CENTER LINE
Installation position
Install on the stern center line.
Installation height
For proper propeller depth and engine
cooling, the boat and outboard motor
transom height must match.
Three outboard motor transom heights
are available. Match your boats transom height to the outboard motor
transom height shown below.
Outboard Motor
Type
Transom Height
Short 16.97 in (43 I mm)
Long 21.73 in (552 mm)
Extra Long 24.88.in (632 mm)
@ MOTOH TRANSOM HEIGHT
@ BOAT TRANSOM HEIGHT
@I O-2 in (O-50 mm)
@ ANTI-VENTLATION PLATE
The anti-ventilation plate should be
O-2 inches below the bottom of the
boat. With the boat in the water, loaded
and motor off, the anti-ventilation plate
should be about 4 inches below the
surface of the water.
-1 Running the outboard
motor without sufficient cooling
water will damage the water pump
and overheat the engine.
24
4. INSTALLATION
Motor attachment
CLAMP SCREW
SAFETY ROPE
Attach the stem bracket to the transom
and tighten the clamp screws.
picq
l Before operating the boat, check
the tightness of the clamp screws.
l Tie a rope through the hole in the
stern bracket and secure the other
end of the rope to the boat. This
will prevent accidental loss of the
motor.
STERN
TRANSOM BOARD
To prevent the outboard motor from
falling accidentally, you may further
secure the stem bracket to the transom
board with the optional Mounting Bolt/
Nut Kit. Good quality stainless steel
commercially available bolts, nuts and
washers may also be used.
Before installing the bolts, be sure to
apply sealant to the bolt holes. This
modification should be made by your
authorized Honda Marine dealer.
For battery handling and installation
information refer to pages 79.
25
4. INSTALLATION
Engine Cover Removal/Installation
GINE COVER
To remove, release the engine cover
latch and remove the engine cover.
To install, position the engine cover
over the engine and hook and lock the
latch.
26
FRONT SIDE
5. PRE-OPERATION CHECKS
Engine Oil
Engine oil is a major factor affecting
engine performance and service life.
@@@ Running the engine with
insufficient oil can cause serious
en&e damage.
Recommended oil
Use high-detergent, premium quality
Cstroke engine oil, certified to meet
or exceed U.S. automobile manufactures’ requirements for American
Petroleum Institute (API) Service
Classification SG,
SH.
Engine oils
classified SG, SH will show these
designations on the container.
Select the appropriate viscosity for the
average temperature in your area.
SAE low-30 is recommended for
general, all-temperature use
SAE 5W-30 is recommended for general, all-temperature use (BF30A).
API Service Grade: Use a Fuel Efficient
SG, SH oil.
(BF25A).
NOTE: This oil is usually identified by
words such as: “Energy Conserving 11.”
“Gas Saving, ” “Fuel Saving, ” etc.
20 30 4o'C
-30 -20 -10 0
Inspection
10
1. Position the outboard motor vertically, and remove the engine cover.
2. Remove the oil level dipstick and
wipe with a clean rag.
3. Reinsert the dipstick all the way in,
then pull
it out
and read the level. If
the oil registers near or below the
lower limit mark, remove the oil filler
cap and fill to the upper limit mark
with the recommended oil.
NOTICE
oil can damage the engine.
Do not overfill. Excessive
OIL FILLE
,CAP
DIPSTICK
4. Reinstall the oil filler cap and
tighten securely.
5. Install the engine cover and lock it
securely.
When the engine oil is contaminated or
discolored, replace with fresh engine oil
(refer to page 74 for oil capacity,
replacement interval and procedure).
To avoid incorrect gauging of the
engine oil level, inspect the oil level
when the engine has cooled.
27
5. PRE-OPERATION CHECKS
Fuel Level
SAFE FILL LEVEL
VENT KNOB
FUEi
\
b
:
I c
AC
#AP
Check the fuel gauge and refill the
tank to the&WE FILL level mark if
necessary.
Fuel tank capacity : 6.6 US gal. (25 lit)
28
B Gasoline is
extremely flammable, bnd gaso-
line 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.
Refilling
Remove the fuel tank from the boat
for refilling. Turn the vent knob counterclockwise to the open position and
remove the fuel cap.
Refuel in a well-ventilated area. Fill
the fuel tank up to the SAFE FILL
level mark only. Inspect the condition
of the fuel cap gasket and replace if
necessary.
After refilling, install and tighten the
fuel cap securely. Turn the vent knob
clockwise to the closed position.
Return the fuel tank to the boat.
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