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