Honda Bf5 Owners Manual

							69 Carburetor Modif ication f or
High Altitude Operation
TECHNICAL AND CONSUMER INFORMATION
When the carburetor has been
modif ied f or high altitude operation,
the air-f uel mixture will be too lean
f or low altitude use. Operation at
altitudes below 5,000 f eet (1,500
meters) with modif ied carburetor
may cause the engine to overheat
and result in serious engine damage.
For use at low altitudes, have an
authorized Honda marine dealer
return the carburetor to original
f actory specif ications. Even with carburetor modification,
engine horsepower will decrease
about 3.5% f or each 1,000-f oot (300-
meter) increase in altitude. The ef f ect
of altitude on horsepower will be
greater than this if no carburetor
modif ication is made. At high altitude, the standard
carburetor air-fuel mixture will be
too rich. Perf ormance will decrease,
and f uel consumption will increase.
A very rich mixture will also f oul the
spark plug and cause hard starting.
High altitude perf ormance can be
improved by specific modifications
to the carburetor. If you always
operate your outboard motor at
altitudes above 5,000 f eet (1,500
meters), have an authorized Honda
marine dealer perform this carburetor
modification.
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							70 Oxygenated Fuels
ETHANOL:
MTBE:
METHANOL:
TECHNICAL AND CONSUMER INFORMATION
Some conventional gasolines are
being blended with alcohol or an
ether compound. These gasolines are
collectively referred to as oxygenated
f uels. To meet clean air standards,
some areas of the United States and
Canada use oxygenated fuels to help
reduce emissions.
If you use an oxygenated fuel, be
sure it is unleaded and meets the
minimum octane rating requirement.
Before using an oxygenated fuel, try
to confirm the fuel’s contents. Some
states/provinces require this
information to be posted on the pump.The following are the EPA-approved
percentages of oxygenates:
ethyl or grain alcohol;
10% by volume.
You may use gasoline containing up
to 10% ethanol by volume. Gasoline
containing ethanol may be marketed
under the name ‘‘Gasohol’’.
Methyl Tertiary Butyl Ether;
15% by volume.
You may use gasoline containing up
to 15% MTBE by volume.
methyl or wood
alcohol; 5% by volume.
You may use gasoline containing up
to 5% methanol by volume, as long
as it also contains cosolvents and
corrosion inhibitors to protect the
f uel system. Gasoline containing
more than 5% methanol by volume
may cause starting and/or
performance problems. It may alsodamage metal, rubber, and plastic
parts of your fuel system.
If you notice any undesirable
operating symptoms, try another
service station, or switch to another
brand of gasoline.
Fuel system damage or performance
problems resulting f rom the use of an
oxygenated fuel containing more
than the percentages of oxygenates
mentioned above are not covered
under warranty.
04/03/15 10:38:12 31ZV1630_071 
						

							71 Emission Control System
Inf ormation
TECHNICAL AND CONSUMER INFORMATION
Source of EmissionsTampering and Altering The U.S. and Calif ornia Clean
Air Acts
The combustion process produces
carbon monoxide, oxides of nitrogen,
and hydrocarbons. Control of
hydrocarbons and oxides of nitrogen
is very important because, under
certain conditions, they react to f orm
photochemical smog when subjected
to sunlight. Carbon monoxide does
not react in the same way, but it is
toxic.
Honda utilizes lean carburetor
settings and other systems to reduce
the emissions of carbon monoxide,
oxides of nitrogen, and hydrocarbons.Tampering with or altering the
emission control system may increase
emissions beyond the legal limit.
Among those acts that constitute
tampering are:
Removal or alteration of any part
of the intake, fuel, or exhaust
systems.
Alterations that would cause the
engine to operate outside its design
parameters. EPA and California regulations
require all manufacturers to furnish
written instructions describing the
operation and maintenance of
emission control systems.
The f ollowing instructions and
procedures must be followed in order
to keep the emissions from your
Honda engine within the emission
standards.
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							72
TECHNICAL AND CONSUMER INFORMATION
Maintenance Replacement Parts Problems That May Af f ect
Emissions
A manuf acturer of an af termarket
part assumes the responsibility that
the part will not adversely af f ect
emission performance. The
manufacturer or rebuilder of the part
must certif y that use of the part will
not result in a f ailure of the engine to
comply with emission regulations.
Follow the maintenance schedule on
p. . Remember that this schedule
is based on the assumption that your
machine will be used for its designed
purpose. Sustained high-load
operation, or use in unusual
conditions, will require more
frequent service. If you are aware of any of the
following symptoms, have your
engine inspected and repaired by
your servicing dealer.
Hard starting or stalling af ter
starting.
Rough idle.
Misfiring or backfiring under load.
Afterburning (backfiring).
Black exhaust smoke or high fuel
consumption.The emission control systems on
your Honda engine were designed,
built, and certif ied to conf orm with
EPA and California emission
regulations. We recommend the use
of genuine Honda parts whenever
you have maintenance done. These
original-design replacement parts are
manufactured to the same standards
as the original parts, so you can be
confident of their performance. The
use of replacement parts that are not
of the original design and quality
may impair the effectiveness of your
emission control system.39
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							73 Star Label
The Symbol for Cleaner Marine Engines:
Cleaner Air and Water -
Better Fuel Economy -
Longer Emission Warranty -
TECHNICAL AND CONSUMER INFORMATION
The Star Label means Cleaner Marine Engine
A Star label was applied to this
outboard motor in accordance with
the requirements of the California
Air Resources Board.
f or healthier lif estyle and environment.
burns up to 30 - 40 percent less gas and oil than
conventional carbureted two-stroke engines, saving money and resources.
protects consumer for worry free operation. This engine has been certified as a:
04/03/15 10:38:48 31ZV1630_074 
						

							74Two Stars
Very Low
Emission One Star
Low
Emission
Three Stars
Ultra Low
Emission
Four Stars
Super Ultra
Low Emission
TECHNICAL AND CONSUMER INFORMATION
The one-star label identifies engines that meet the Air Resources Board’s
Personal Watercraft and Outboard marine engine 2001 exhaust emission
standards. Engines meeting these standards have 75% lower emissions than
conventional carbureted two-stroke engines. These engines are equivalent to
the U.S.EPA’s 2006 standards for marine engines.
The two-star label identif ies engines that meet the Air Resources Board’s
Personal Watercraft and Outboard marine engine 2004 exhaust emission
standards. Engines meeting these standards have 20% lower emissions than
One Star-Low Emission engines.
The four-star label identifies engines that meet the Air Resources Board’s
Sterndrive and Inboard marine engine 2009 exhaust emission standards.
Personal Watercraf t and Outboard marine engines may also comply with
these standards. Engines meeting these standards have 90% lower emissions
than One Star-Low Emission engines. The three-star label identifies engines that meet the Air Resources Board’s
Personal Watercraft and Outboard marine engine 2008 exhaust emission
standards or the Sterndrive and inboard marine engine 2003-2008 exhaust
emission standards. Engines meeting these standards have 65% lower
emissions than One Star-Low Emission engines.
Cleaner Watercraf t - Get the Facts
1-800-END-SMOG
www.arb.ca.gov
04/03/15 10:39:00 31ZV1630_075 
						

							µ
µµ ···
µ
µ
¶
¶
¶ BF5A
BADS
13.8 in (350 mm)LA SA
20.7 in (525 mm)
39.6 in (1,005 mm) 44.7 in (1,135 mm)
17.5 in (445 mm) 22.5 in (572 mm)
59.5 lbs (27.0 kg) 60.6 lbs (27.5 kg)
3.7 kW (5.0 HP)
4,500 5,000 rpm
4 stroke OHV 1 cylinder, water-cooled
7.7 cu-in (127 cm
)
0.028 0.031 in (0.70 0.80 mm)
Recoil starter
Transistorized Ignition Control Module (ICM)
Trochoid pump pressure lubrication
API standard (SG, SH, SJ)
SAE 10W-30
API standard (GL 4/5)
SAE 90 outboard motor gear oil
0.1 US qt (0.1
) 0.58 US qt (0.55)
Water cooling with thermostat
Underwater exhaustBPR5ES (NGK)
W16EPR-U (DENSO)
Diaphragm type fuel pump
Automotive unleaded gasoline
(86 pump octane or higher)
3.2 US gal (12
)
Forward-Neutral-Reverse (dog type)
45° right and left
5 stages (5°,9°,13°,17°,21°)
3 stages adjustment (30°, 45° and 70°)
7-25/32 7-31/64 in (3-200 190 mm)
0.028 0.031 in
(0.70 0.80 mm)
1,300 100 rpm
0.10 0.04 mm
0.15 0.04 mm
No other adjustment is neededSeepage45
See shop
manual
See shop
manual
ULTRA LOW EMISSION Gear case: Engine:
Engine:
Gear case:Exhaust:
Intake:
75 Specif ications
TECHNICAL AND CONSUMER INFORMATION
Tuneup
MODEL
Description Code
Type
Overall length
Overall width
Overall height
Transom height
Weight
Rated power
Full throttle range
Engine type
Displacement
Sparkpluggap
Starter system
Ignition system
Lubrication system
Specified oil
Oil capacity
CARB star label
Cooling system
Exhaust systemSpark plugs
Fuel pump
Fuel
Tank capacity
Gear change
Steering angle
Transom angle
Tilt angle
Standard propeller
(No. of blades-
diameter pitch)
Sparkpluggap
Idle speed
Valve clearance
(cold)
Other specifications
Honda outboards are power rated in accordance with NMMA procedures and using the ICOMIA standard 28/23.
04/03/15 10:39:42 31ZV1630_076 
						

							76 CONSUMER INFORMATION
Honda PublicationsCustomer Service Inf ormation
American Honda Motor Co., Inc.
TECHNICAL AND CONSUMER INFORMATION
Shop Manual
Parts Catalog
Honda Marine dealership personnel
are trained professionals. They
should be able to answer any
question you may have. If you
encounter a problem that your dealer
does not solve to your satisfaction,
please discuss it with the dealership’s
management. The Service Manager
or General Manager can help. Almost
all problems are solved in this way.
If you are dissatisf ied with the
decision made by the dealership’s
management, contact the Honda
Marine Customer Relations Office.
You can write:
Marine Division
Customer Relations Of f ice
4900 Marconi Drive
Alpharetta, Georgia 30005-8847Or telephone: (770) 497-6400
When you write or call, please give
us this inf ormation:
Model and serial numbers (p. )
Name of the dealer who sold the
outboard motor to you
Name and address of the dealer
who services your outboard motor
Date of purchase
Your name, address, and telephone
number
A detailed description of the
problem These publications will give you
additional information for
maintaining and repairing your
outboard motor. You may order them
from your Honda marine dealer.
This manual covers complete
maintenance and overhaul procedures.
It is intended to be used by a skilled
technician.
This manual provides complete,
illustrated parts lists.68
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