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Honda BF40D - User Manual

Honda BF40D
737 pages
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This manual covers service and repair procedures for
Honda BF40D•BF50D outboard motors.
All information contained in this manual is based on the
latest product information available at the time of
printing. We reserve the right to make changes at anytime
without notice.
No part of this publication may be reproduced, stored in
a retrieval system, or transmitted, in any form, by any
means, electronic, mechanical, photocopying, recording,
or otherwise, without prior written permission of the
publisher. This includes text, figures, and tables.
As you read this manual, you will find information that is
preceded by a symbol. The purpose of this
message is to help prevent damage to the outboard
motor, other property, or the environment.
SAFETY MESSAGES
Your safety and the safety of others are very important.
To help you make informed decisions, we have provided
safety messages and other safety information throughout
this manual. Of course, it is not practical or possible to
warn you about all the hazards associated with servicing
these outboard motors. You must use your own good
judgment.
You will find important safety information in a variety of
forms, including:
SSaaffeettyy llaabbeellss
on the engine cover.
SSaaffeettyy mmeessssaaggeess
Preceded by a safety alert symbol
and one of three signal words, DANGER, WARNING,
or CAUTION.
These signal words mean:
You WILL be KILLED or
SERIOUSLY HURT if you don't
follow instructions.
You CAN be KILLED or
SERIOUSLY HURT if you don't
follow instructions.
You CAN be HURT if you don't
follow instructions.
IInnssttrruuccttiioonnss
how to service this outboard motor
correctly and safely.
HHoonnddaa MMoottoorr CCoo..,, LLttdd..
SSeerrvviiccee PPuubblliiccaat
tiioonnss OOffffiiccee
NOTICE
SPECIFICATIONS
1
SERVICE INFORMATION
2
MAINTENANCE
3
COVER
4
PROGRAMMED-FUEL INJECTION
5
ENGINE REMOVAL/INSTALLATION
6
ALTERNATOR/PULSER ROTOR/TIMING BELT
7
WATER JACKET COVER/THERMOSTAT
8
CYLINDER HEAD/VALVES/OIL PUMP
9
CRANKCASE/CYLINDER BLOCK/
CRANKSHAFT/PISTONS
10
PROPELLER/GEAR CASE/EXTENSION CASE/
OIL CASE
11
SHIFT ROD/ENGINE UNDER CASE
12
MOUNT CASE/STERN BRACKET/
SWIVEL CASE
13
POWER TRIM/TILT ASSEMBLY/GAS ASSISTED
DAMPER ASSEMBLY
14
STEERING ROD/REMOTE CONTROL BOX
[REMOTE CONTROL TYPE]
15
TILLER HANDLE [TILLER HANDLE TYPE]
16
CABLES/THROTTLE ARM BRACKET
17
ELECTRICAL EQUIPMENT
18
WIRING DIAGRAMS/SYSTEM DIAGRAM
19
DANGER
WARNING
CAUTION
INTRODUCTION CONTENTS
Sections in pale print are included in VOLUME 1.
*: Refer to the page 2-1 and 2-2 of VOLUME 1 carefully
before servicing.
Date of lssue: March, 2008
© Honda Motor Co., Ltd.
1

Table of Contents

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Questions and Answers

  • D
    Dr. Erin Lambert MDJul 30, 2025
    Why is my Honda Outboard Motor overheating?
    • V
      Vanessa LangJul 30, 2025
      Your Honda Outboard Motor may be overheating due to several reasons. A clogged cooling water intake port can cause overheating, so cleaning it is recommended. Another potential cause is a shortage of engine oil; adding engine oil to the specified level may resolve the issue. Also, spark plugs with an improper heat range can lead to overheating.
  • J
    John SchmidtAug 7, 2025
    What to do if the overheat warning system comes on in my Honda BF40D Outboard Motor?
    • J
      jonespaulaAug 7, 2025
      If the overheat warning system activates, it could be due to a clogged cooling water intake port. Try cleaning the cooling water intake port. Another potential cause is the use of spark plugs with an improper heat range. In this case, replace the spark plugs.
  • G
    Geoffrey GonzalezAug 14, 2025
    Why does the oil pressure warning system come on in my Honda BF40D?
    • C
      Cameron DeanAug 14, 2025
      The oil pressure warning system might activate due to a shortage of engine oil. Add engine oil to the specified level. It could also be caused by using improper engine oil, so change the engine oil.
  • A
    Adriana WoodAug 22, 2025
    What does it mean when the ACG warning system comes on in my Honda BF40D Outboard Motor?
    • J
      jenniferbeckerAug 22, 2025
      If the ACG warning system is activated, the battery voltage may be too high or too low. Check the battery.

Honda BF40D Specifications

General IconGeneral
Displacement808 cc
Full Throttle RPM Range5, 000-6, 000 RPM
Horsepower40 HP
Cooling SystemWater Cooled
Starting SystemElectric
LubricationWet Sump
Trim Range-4° to +16°
Tilt Range72°
SteeringRemote
Gear ShiftF-N-R
Gear Ratio2.08:1
Fuel Tank CapacityExternal
Fuel DeliveryProgrammed Fuel Injection
ExhaustThrough Propeller
Weight205 lbs
Shaft LengthL type: 20 in, X type: 25 in
Alternator Output12V
Engine Type4-Stroke, SOHC, 3 Cylinder
Cylinder ConfigurationInline 3

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