Yamaha 40V User manual

OWNER’S MANUAL
40V
40Y
50H
63B-28199-79-E0

EMU25050
Read this owner’s manual carefully before operating your outboard motor.

Important manual information
EMU25100
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.
The Safety Alert Symbol means
ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED!
WARNING
EWM00780
Failure to follow WARNING instructions
could result in severe injury or death to
the machine operator, a bystander, or a
person inspecting or repairing the out-
board motor.
CAUTION:
ECM00700
A CAUTION indicates special precautions
that must be taken to avoid damage to the
outboard motor.
NOTE:
A NOTE provides key information to make
procedures 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.
NOTE:
The 40VEO, 40VETO, 40VMHO, 40YETO,
40YMHO, 50HEDO, 50HETO, 50HMHO and
the standard accessories are used as a base
for the explanations and illustrations in this
manual. Therefore some items may not ap-
ply to every model.
EMU25120
40V, 40Y, 50H
OWNER’S MANUAL
©2004 by Yamaha Motor Co., Ltd.
1st Edition, April 2004
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
General information .......................... 1
Identification numbers record........... 1
Outboard motor serial number .......... 1
Key number....................................... 1
EC label............................................ 1
Safety information ............................ 2
Important labels................................ 3
Warning labels .................................. 3
Fueling instructions .......................... 3
Gasoline............................................ 4
Engine oil .......................................... 4
Battery requirement.......................... 4
Battery specifications ........................ 4
Propeller selection............................ 4
Start-in-gear protection .................... 5
Basic components ............................ 6
Main components............................. 6
Fuel tank ........................................... 8
Fuel joint ........................................... 9
Fuel gauge ........................................ 9
Fuel tank cap .................................... 9
Air vent screw ................................... 9
Remote control.................................. 9
Remote control lever......................... 9
Neutral interlock trigger................... 10
Neutral throttle lever........................ 10
Tiller handle .................................... 10
Gear shift lever................................ 10
Throttle grip..................................... 11
Throttle indicator ............................. 11
Throttle friction adjuster................... 11
Engine stop lanyard switch ............. 12
Engine stop button .......................... 12
Choke knob for pull type ................. 13
Manual starter handle ..................... 13
Main switch ..................................... 13
Steering friction adjuster ................. 13
Steering friction adjuster ................. 14
Power trim and tilt switch on remote
control or tiller handle ................... 14
Power trim and tilt switch on bottom
engine cowling .............................. 14
Trim tab with anode ........................ 15
Trim rod (tilt pin).............................. 15
Tilt lock mechanism......................... 15
Tilt support lever for power trim and
tilt or hydro tilt model.....................16
Tilt support lever for manual tilt
model ............................................ 16
Top cowling lock lever(s) (turn
type) .............................................. 16
Warning indicator for three
indicators....................................... 17
Warning indicator ............................ 17
Tachometer ..................................... 17
Digital tachometer ........................... 17
Oil level indicators (three
indicators 2) .................................. 18
Oil level indicator (digital type) ........ 18
Overheat warning indicator ............. 18
Overheat warning indicator
(digital type) .................................. 18
Trim meter ....................................... 19
Trim meter (digital type) .................. 19
Hour meter (digital type)..................19
Warning system ............................. 20
Overheat warning ............................ 20
Oil level warning and oil filter
clogging warning ........................... 21
Operation ......................................... 23
Installation...................................... 23
Mounting the outboard motor .......... 23
Clamping the outboard motor..........24
Breaking in engine ......................... 25
Gasoline and engine oil mixing
chart (50:1).................................... 25
Procedure for oil injection models ... 25
Preoperation checks ...................... 26
Fuel ................................................. 26
Oil .................................................... 26
Controls ........................................... 26
Engine ............................................. 26
Operation after long period of
storage .......................................... 26
Filling fuel and engine oil ............... 27
Filling fuel for portable tank ............. 27
Filling oil for manual starter
model ............................................ 27
Filling oil for electric start models .... 28
Oil level indicator operation............. 29

Table of contents
Operating engine............................ 30
Feeding fuel (portable tank) ............ 30
Starting engine................................ 31
Warming up engine ........................ 34
Choke start models ......................... 34
Electric start and prime start
models .......................................... 34
Shifting ........................................... 35
Forward (tiller handle and remote
control models) ............................. 35
Reverse (automatic reverse lock
and power trim and tilt models)..... 35
Reverse (manual tilt and hydro tilt
models) ......................................... 36
Stopping engine ............................. 37
Procedure ....................................... 37
Trimming outboard motor............... 37
Adjusting trim angle for manual tilt
models .......................................... 38
Adjusting trim angle ........................ 39
Adjusting trim angle for hydro tilt
models .......................................... 39
Adjusting boat trim .......................... 40
Tilting up and down ........................ 41
Procedure for tilting up.................... 41
Procedure for tilting up (hydro tilt
models) ......................................... 42
Procedure for tilting up.................... 42
Procedure for tilting down ............... 44
Procedure for tilting down (manual
and hydro tilt models) ................... 44
Procedure for tilting down ............... 44
Cruising in shallow water ...............45
Hydro tilt models ............................. 45
Power trim and tilt models / power
tilt models...................................... 46
Cruising in other conditions............ 47
Maintenance..................................... 48
Specifications ................................. 48
Transporting and storing outboard
motor ............................................ 50
Clamp screw mounting models....... 51
Storing outboard motor ................... 51
Procedure ....................................... 51
Lubrication (oil injection models)..... 52
Battery care ..................................... 52
Cleaning the outboard motor...........53
Checking painted surface of
motor............................................. 53
Periodic maintenance .................... 53
Replacement parts .......................... 53
Maintenance chart........................... 55
Greasing.......................................... 56
Cleaning and adjusting spark
plug ............................................... 57
Checking fuel system ...................... 58
Inspecting fuel filter ......................... 59
Cleaning fuel filter ...........................59
Inspecting idling speed....................60
Checking water in engine oil tank ...60
Checking wiring and connectors ..... 61
Exhaust leakage.............................. 61
Water leakage ................................. 61
Checking power trim and tilt
system........................................... 61
Checking propeller .......................... 62
Removing the propeller ................... 63
Installing the propeller ..................... 63
Changing gear oil ............................ 64
Cleaning fuel tank ...........................65
Inspecting and replacing
anode(s)........................................ 65
Checking battery (for electric start
models) ......................................... 66
Connecting the battery .................... 67
Disconnecting the battery................67
Checking top cowling ...................... 67
Coating the boat bottom.................. 68
Trouble Recovery............................ 69
Troubleshooting ............................. 69
Temporary action in emergency .... 72
Impact damage ............................... 72
Replacing fuse ................................ 72
Power trim and tilt will not
operate.......................................... 73
Starter will not operate .................... 73
Emergency starting engine .............74
Emergency starting engine .............75
Engine fails to operate ................... 76
Cold engine fails to start..................76

Table of contents
Treatment of submerged motor......77
Procedure ....................................... 77

1
General information
EMU25170
Identification numbers record
EMU25182
Outboard motor serial number
The outboard motor serial number is
stamped on the label attached to the port
side of the clamp bracket or the upper part of
the swivel bracket.
Record your outboard motor serial number in
the spaces provided to assist you in ordering
spare parts from your Yamaha dealer or for
reference in case your outboard motor is sto-
len.
EMU25190
Key number
If a main key switch is equipped with the mo-
tor, the key identification number is stamped
on your key as shown in the illustration.
Record this number in the space provided for
reference in case you need a new key.
EMU25202
EC label
Engines affixed with this label conform to
certain portions of the European Parliament
directive relating to machinery. Refer to the
label and the EC Declaration of Conformity
for more details.
1. Outboard motor serial number location
1
ZMU02931
1. Key number
1. EC label location
1
ZMU04889

General information
2
EMU25370
Safety information
●
Before mounting or operating the outboard
motor, read this entire manual. Reading it
should give you an understanding of the
motor and its operation.
●
Before operating the boat, read any own-
er’s or operator’s manuals supplied with it
and all labels. Be sure you understand
each item before operating.
● Do not overpower the boat with this out-
board motor. Overpowering the boat could
result in loss of control. The rated power of
the outboard should be equal to or less
than the rated horsepower capacity of the
boat. If the rated horsepower capacity of
the boat is unknown, consult the dealer or
boat manufacturer.
●
Do not modify the outboard. Modifications
could make the motor unfit or unsafe to
use.
●
Never operate after drinking alcohol or tak-
ing drugs. About 50% of all boating fatali-
ties involve intoxication.
●
Have an approved personal flotation de-
vice (PFD) on board for every occupant. It
is a good idea to wear a PFD whenever
boating. At a minimum, children and non-
swimmers should always wear PFDs, and
everyone should wear PFDs when there
are potentially hazardous boating condi-
tions.
●
Gasoline is highly flammable, and its va-
pors are flammable and explosive. Handle
and store gasoline carefully. Make sure
there are no gas fumes or leaking fuel be-
fore starting the engine.
● This product emits exhaust gases which
contain carbon monoxide, a colorless,
odorless gas which may cause brain dam-
age or death when inhaled. Symptoms in-
clude nausea, dizziness, and drowsiness.
Keep cockpit and cabin areas well ventilat-
ed. Avoid blocking exhaust outlets.
●
Check throttle, shift, and steering for prop-
er operation before starting the engine.
● Attach the engine stop switch lanyard to a
secure place on your clothing, or your arm
or leg while operating. If you accidentally
leave the helm, the lanyard will pull from
the switch, stopping the engine.
●
Know the marine laws and regulations
where you will be boating - and obey them.
●
Stay informed about the weather. Check
weather forecasts before boating. Avoid
boating in hazardous weather.
●
Tell someone where you are going: leave
a Float Plan with a responsible person. Be
sure to cancel the Float Plan when you re-
turn.
●
Use common sense and good judgment
when boating. Know your abilities, and be
sure you understand how your boat han-
dles under the different boating conditions
you may encounter. Operate within your
limits, and the limits of your boat. Always
operate at safe speeds, and keep a careful
watch for obstacles and other traffic.
●
Always watch carefully for swimmers dur-
ing the engine operation.
● Stay away from swimming areas.
ZMU01696

General information
3
●
When a swimmer is in the water near you
shift into neutral and shut off the engine.
EMU25380
Important labels
EMU25395
Warning labels
EMU25401
Label
WARNING
EWM01260
● Be sure shift control is in neutral before
starting engine. (except 2HP)
●
Do not touch or remove electrical parts
when starting or during operation.
●
Keep hands, hair, and clothes away
from flywheel and other rotating parts
while engine is running.
EMU25431
Label
WARNING
EWM01300
●
This engine is equipped with a neutral
starting device.
● The engine will not start unless the shift
control is in neutral position.
EMU25540
Fueling instructions
WARNING
EWM00010
GASOLINE AND ITS VAPORS ARE HIGH-
LY FLAMMABLE AND EXPLOSIVE!
●
Do not smoke when refueling, and keep
away from sparks, flames, or other
sources of ignition.
●
Stop engine before refueling.
●
Refuel in a well-ventilated area. Refuel
portable fuel tanks off the boat.
●
Take care not to spill gasoline. If gaso-
line spills, wipe it up immediately with
dry rags.
●
Do not overfill the fuel tank.
●
Tighten the filler cap securely after re-
fueling.
●
If you should swallow some gasoline,
inhale a lot of gasoline vapor, or get
gasoline in your eyes, get immediate
medical attention.
●
If any gasoline spills onto your skin, im-
mediately wash with soap and water.
Change clothing if gasoline spills on it.
●
Touch the fuel nozzle to the filler open-
ing or funnel to help prevent electro-
static sparks.
CAUTION:
ECM00010
Use only new clean gasoline which has
been stored in clean containers and is not
contaminated with water or foreign mat-
ter.
ZMU03342
ZMU03340

General information
4
EMU25580
Gasoline
If knocking or pinging occurs, use a different
brand of gasoline or premium unleaded fuel.
EMU25650
Engine oil
If the recommended engine oil is not avail-
able, another 2-stroke engine oil with an
NMMA-certified TC-W3 rating may be used.
EMU25690
Battery requirement
CAUTION:
ECM01060
Do not use a battery that does not meet
the specified capacity. If a battery which
does not meet specifications is used, the
electric system could perform poorly or
be overloaded, causing electric system
damage.
For electric start models, choose a battery
which meets the following specifications.
EMU25720
Battery specifications
EMU25741
Propeller selection
The performance of your outboard motor will
be critically affected by your choice of propel-
ler, as an incorrect choice could adversely
affect performance and could also seriously
damage the motor. Engine speed depends
on the propeller size and boat load. If engine
speed is too high or too low for good engine
performance, this will have an adverse effect
on the engine.
Yamaha outboard motors are fitted with pro-
pellers chosen to perform well over a range
of applications, but there may be uses where
a propeller with a different pitch would be
more appropriate. For a greater operating
load, a smaller-pitch propeller is more suit-
able as it enables the correct engine speed
to be maintained. Conversely, a larger-pitch
propeller is more suitable for a smaller oper-
ating load.
Yamaha dealers stock a range of propellers,
and can advise you and install a propeller on
your outboard that is best suited to your ap-
plication.
Recommended gasoline:
Regular unleaded gasoline with a min-
imum octane rating of 90 (Research
Octane Number).
Recommended engine oil:
YAMALUBE 2-stroke outboard motor
oil
Minimum cold cranking amps (CCA/EN):
40VEO 347.0 A
40VETO 347.0 A
40YETO 347.0 A
50HEDO 347.0 A
50HETO 347.0 A
Minimum rated capacity (20HR/IEC):
40VEO 40.0 Ah
40VETO 40.0 Ah
40YETO 40.0 Ah
50HEDO 40.0 Ah
50HETO 40.0 Ah