Yamaha F-20B User manual

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Read this manual carefully before operating this
outboard motor.
OWNER’S MANUAL
F15C
F20B
6AG-28199-23-E0

EMU25052
Read this manual carefully before operating this outboard motor. Keep this
manual onboard in a waterproof bag when boating. This manual should stay
with the outboard motor if it is sold.

Important manual information
EMU25105
To the owner
Thank you for choosing a Yamaha outboard
motor. This Owner’s Manual contains infor-
mation needed for proper operation, mainte-
nance and care. A thorough understanding
of these simple instructions will help you ob-
tain maximum enjoyment from your new
Yamaha. If you have any question about the
operation or maintenance of your outboard
motor, please consult a Yamaha dealer.
In this Owner’s Manual particularly important
information is distinguished in the following
ways.
: This is the safety alert symbol. It is
used to alert you to potential personal injury
hazards. Obey all safety messages that fol-
low this symbol to avoid possible injury or
death.
WARNING
EWM00781
A WARNING indicates a hazardous situa-
tion which, if not avoided, could result in
death or serious injury.
NOTICE
ECM00701
A NOTICE indicates special precautions
that must be taken to avoid damage to the
outboard motor or other property.
T
IP:
A TIP provides key information to make pro-
cedures easier or clearer.
Yamaha continually seeks advancements in
product design and quality. Therefore, while
this manual contains the most current prod-
uct information available at the time of print-
ing, there may be minor discrepancies
between your machine and this manual. If
there is any question concerning this manu-
al, please consult your Yamaha dealer.
To ensure long product life, Yamaha recom-
mends that you use the product and perform
the specified periodic inspections and main-
tenance by correctly following the instruc-
tions in the owner’s manual. Any damage
resulting from neglect of these instructions is
not covered by warranty.
Some countries have laws or regulations re-
stricting users from taking the product out of
the country where it was purchased, and it
may be impossible to register the product in
the destination country. Additionally, the
warranty may not apply in certain regions.
When planning to take the product to another
country, consult the dealer where the prod-
uct was purchased for further information.
If the product was purchased used, please
consult your closest dealer for customer re-
registration, and to be eligible for the speci-
fied services.
T
IP:
The F15CMH, F15CEH, F20BMH,
F20BEHP, F20BEP and the standard acces-
sories are used as a base for the explana-
tions and illustrations in this manual.
Therefore some items may not apply to ev-
ery model.
EMU25121
F15C, F20B
OWNER’S MANUAL
©2009 by Yamaha Motor Co., Ltd.
1st Edition, February 2009
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Japan

Table of contents
Safety information............................. 1
Outboard motor safety .................... 1
Propeller............................................ 1
Rotating parts.................................... 1
Hot parts ........................................... 1
Electric shock.................................... 1
Power tilt ........................................... 1
Engine shut-off cord (lanyard)........... 1
Gasoline............................................ 1
Gasoline exposure and spills ............ 2
Carbon monoxide.............................. 2
Modifications ..................................... 2
Boating safety ................................. 2
Alcohol and drugs ............................. 2
Personal flotation devices ................. 2
People in the water ........................... 2
Passengers ....................................... 2
Overloading....................................... 2
Avoid collisions ................................. 3
Weather ............................................ 3
Passenger training ............................ 3
Boating safety publications ............... 3
Laws and regulations ........................ 3
General information .......................... 4
Identification numbers record.......... 4
Outboard motor serial number .......... 4
Key number....................................... 4
C-Tick label ..................................... 4
Read manuals and labels................ 6
Warning labels .................................. 6
Specifications and requirements..... 9
Specifications .................................. 9
Installation requirements ............... 11
Boat horsepower rating................... 11
Mounting motor ............................... 11
Remote control requirements........ 11
Battery requirements..................... 11
Battery specifications ...................... 11
Mounting battery ............................. 11
Multiple batteries............................. 11
Without a rectifier or Rectifier
Regulator ...................................... 12
Propeller selection......................... 12
Start-in-gear protection ................. 12
Engine oil requirements ................ 13
Fuel requirements......................... 13
Gasoline .......................................... 13
Muddy or acidic water................... 13
Anti-fouling paint ........................... 14
Motor disposal requirements......... 14
Emergency equipment.................. 14
Components .................................... 15
Components diagram.................... 15
Fuel tank ......................................... 16
Fuel joint.......................................... 17
Fuel gauge ...................................... 17
Fuel tank cap...................................17
Air vent screw..................................17
Remote control box ......................... 17
Remote control lever ....................... 17
Neutral interlock trigger ................... 18
Neutral throttle lever........................18
Tiller handle..................................... 18
Gear shift lever................................18
Throttle grip ..................................... 19
Throttle indicator ............................. 19
Throttle friction adjuster...................19
Engine shut-off cord (lanyard) and
clip................................................. 20
Engine stop button .......................... 20
Manual starter handle .....................21
Starter button .................................. 21
Main switch ..................................... 21
Power tilt switch ..............................21
Steering friction adjuster .................22
Steering friction adjuster .................23
Trim tab ........................................... 23
Trim rod (tilt pin) .............................. 23
Tilt lock mechanism......................... 24
Tilt support knob.............................. 24
Tilt support bar ................................ 24
Power tilt unit................................... 25
Cowling lock lever (pull up type) .....25
Flushing device ............................... 26
Alert indicator .................................. 26
Instruments and indicators............ 27
Indicators ...................................... 27
Low oil pressure-alert indicator ....... 27
Overheat-alert indicator................... 27

Table of contents
Engine control system.................... 28
Alert system .................................. 28
Overheat alert ................................. 28
Low oil pressure alert...................... 28
Installation ....................................... 30
Installation ..................................... 30
Mounting the outboard motor.......... 30
Clamping the outboard motor ......... 32
Operation ......................................... 33
First-time operation ....................... 33
Fill engine oil ................................... 33
Breaking in engine .......................... 33
Getting to know your boat ............... 33
Checks before starting engine ...... 33
Fuel level......................................... 33
Remove cowling.............................. 34
Fuel system..................................... 34
Controls........................................... 34
Engine shut-off cord (lanyard)......... 35
Engine oil ........................................ 35
Engine............................................. 36
Flushing device ............................... 36
Install cowling.................................. 36
Checking power tilt system ............. 36
Battery............................................. 37
Filling fuel ...................................... 37
Operating engine........................... 38
Sending fuel (portable tank)............ 38
Starting engine................................ 39
Checks after starting engine ......... 44
Cooling water .................................. 44
Warming up engine ....................... 44
Manual start and electric start
models .......................................... 44
Checks after engine warm-up ....... 45
Shifting ............................................ 45
Stop switches.................................. 45
Shifting .......................................... 45
Stopping boat ................................ 46
Stopping engine ............................ 47
Procedure ....................................... 47
Trimming outboard motor.............. 48
Adjusting trim angle for manual tilt
models .......................................... 48
Adjusting trim angle (power tilt
models) ......................................... 49
Adjusting boat trim ..........................49
Tilting up and down....................... 50
Procedure for tilting up (manual tilt
models) ......................................... 51
Procedure for tilting up (power tilt
models) ......................................... 51
Procedure for tilting down (manual
tilt models)..................................... 53
Procedure for tilting down (power
tilt models)..................................... 53
Shallow water................................ 54
Cruising in shallow water (manual
tilt models)..................................... 54
Power tilt models.............................55
Cruising in other conditions........... 56
Maintenance .................................... 57
Transporting and storing outboard
motor ........................................... 57
Dismounting the outboard motor.....57
Storing outboard motor ...................58
Procedure........................................ 59
Lubrication....................................... 60
Flushing power unit ......................... 60
Cleaning the outboard motor........... 61
Checking painted surface of
motor............................................. 61
Periodic maintenance ................... 61
Replacement parts .......................... 61
Severe operating conditions............ 62
Maintenance chart 1........................ 63
Maintenance chart 2........................ 65
Greasing.......................................... 66
Cleaning and adjusting spark
plug ............................................... 67
Checking fuel filter........................... 68
Inspecting idling speed.................... 68
Changing engine oil ........................69
Checking wiring and connectors ..... 70
Checking propeller .......................... 71
Removing propeller ......................... 71
Installing propeller ........................... 72
Changing gear oil ............................ 72
Cleaning fuel tank ...........................73
Inspecting and replacing