Yamaha F50F User manual

F50F
FT50G
F60C
FT60D
SERVICE MANUAL
6C1-28197-3G-11
290551

NOTICE
This manual has been prepared by Yamaha primarily for use by Yamaha dealers and their trained
mechanics when performing maintenance procedures and repairs to Yamaha equipment. It has
been written to suit the needs of persons who have a basic understanding of the mechanical and
electrical concepts and procedures inherent in the work, for without such knowledge attempted
repairs or service to the equipment could render it unsafe or unfit for use.
Because Yamaha has a policy of continuously improving its products, models may differ in detail
from the descriptions and illustrations given in this publication. Use only the latest edition of this
manual. Authorized Yamaha dealers are notified periodically of modifications and significant
changes in specifications and procedures, and these are incorporated in successive editions of this
manual.
Important information 1
Particularly important information is distinguished in this manual by the following notations:
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED!
WARNING
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 outboard motor.
CAUTION:
A CAUTION indicates special precautions that must be taken to avoid damage to the out-
board motor.
NOTE:
A NOTE provides key information to make procedures easier or clearer.
F50F, FT50G, F60C, FT60D
SERVICE MANUAL
©2004 by Yamaha Motor Co., Ltd.
1st Edition, July 2004
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in the Netherlands

Contents
General information 1
GEN
INFO
Specifications 2
SPEC
Periodic checks and adjustments 3
CHK
ADJ
Fuel system 4
FUEL
Power unit 5
POWR
Lower unit 6
LOWR
Bracket unit 7
BRKT
Electrical systems 8
ELEC
Troubleshooting 9
TRBL
SHTG
Index
–+

6C13G11
GEN
INFO
1
2
3
4
5
6
7
8
9
General information
How to use this manual.................................................................................1-1
Manual format............................................................................................1-1
Symbols.....................................................................................................1-2
Safety while working......................................................................................1-3
Fire prevention...........................................................................................1-3
Ventilation..................................................................................................1-3
Self-protection ...........................................................................................1-3
Parts, lubricants, and sealants ..................................................................1-3
Good working practices .............................................................................1-4
Disassembly and assembly .......................................................................1-4
Identification...................................................................................................1-4
Applicable models .....................................................................................1-4
Serial number ............................................................................................1-5
Outline of features .........................................................................................1-6
Features and benefits....................................................................................1-7
Fuel system ...............................................................................................1-7
Solenoid valve ...........................................................................................1-8
Electronic control system...........................................................................1-9
ECM (Electric Control Module) ................................................................1-10
Variable trolling RPM switch (optional)....................................................1-11
Propeller selection.......................................................................................1-12
Propeller size...........................................................................................1-12
Selection..................................................................................................1-12
Predelivery checks ......................................................................................1-13
Checking the fuel system ........................................................................1-13
Checking the engine oil level...................................................................1-13
Checking the gear oil level ......................................................................1-13
Checking the battery................................................................................1-13
Checking the outboard motor mounting height........................................1-14
Checking the remote control cables ........................................................1-14
Checking the steering system .................................................................1-14
Checking the gear shift and throttle operation.........................................1-15
Checking the power trim and tilt system..................................................1-15
Checking the hydro tilt system.................................................................1-15
Checking the engine start switch and engine stop lanyard switch ..........1-16
Checking the cooling water pilot hole ......................................................1-16
Test run ...................................................................................................1-17
Break-in ...................................................................................................1-17
After test run ............................................................................................1-17

GEN
INFO General information
1-1 6C13G11
How to use this manual 1
Manual format
The format of this manual has been designed to make service procedures clear and easy to under-
stand. Use the information below as a guide for effective and quality service.
1Parts are shown and detailed in an exploded diagram and are listed in the components list.
2Tightening torque specifications are provided in the exploded diagrams and after a numbered
step with tightening instructions.
3Symbols are used to indicate important aspects of a procedure, such as the grade of lubricant
and lubrication point.
4The components list consists of part names and part quantities, as well as bolt and screw dimen-
sions.
5Service points regarding removal, checking, and installation are shown in individual illustrations
to explain the relevant procedure.
NOTE:
For troubleshooting procedures, see Chapter 9, “Troubleshooting.”
LOWR Lower unit
6-5 62Y5A11
Lower unit
No. Part name Q’ty Remarks
1 Lower unit 1
2 Plastic tie 1 Not reusable
3Hose 1
4 Check screw 1
5 Gasket 2 Not reusable
6 Dowel pin 2
7 Bolt 4 M10 40 mm
8 Drain screw 1
9Grommet 1
10 Bolt 1 M10 45 mm
11 Bolt 1 M8 60 mm
12 Thrust washer 1
13 Propeller 1
14 Washer 1
15 Washer 1
16 Cotter pin 1 Not reusable
17 Propeller nut 1
18 Trim tab 1
LOWR Lower unit
6-19 62Y5A11
Removing the drive shaft
1. Remove the drive shaft assembly and
pinion, and then pull out the forward
gear.
Disassembling the drive shaft
1. Install the pinion nut 1, tighten it finger
tight, and then remove the drive shaft
bearing 2using a press.
CAUTION:
•Do not press the drive shaft threads a
directly.
•Do not reuse the bearing, always
replace it with a new one.
Disassembling the forward gear
1. Remove the taper roller bearing from the
forward gear using a press.
CAUTION:
Do not reuse the bearing, always replace
it with a new one.
2. Remove the needle bearing from the for-
ward gear.
CAUTION:
Do not reuse the bearing, always replace
it with a new one.
Drive shaft holder 4 1: 90890-06518
Pinion nut holder 2: 90890-06505
Socket adapter 2 3: 90890-06507
Bearing inner race attachment 3:
90890-06639
S62Y6850K
Bearing separator 1: 90890-06534
Stopper guide plate 2: 90890-06501
Stopper guide stand 3:
90890-06538
Bearing puller 4: 90890-06535
Bearing puller claw 1 5:
90890-06536
S62Y6740K
5
4
321

6C13G11 1-2
1
2
3
4
5
6
7
8
9
Symbols
The symbols below are designed to indicate the content of a chapter.
General information
Specifications
Periodic checks and adjustments
Fuel system
Power unit
Lower unit
Bracket unit
Electrical systems
Troubleshooting
GEN
INFO
SPEC
CHK
ADJ
FUEL
POWR
LOWR
BRKT
ELEC
TRBL
SHTG
–+
Symbols 1to 6indicate specific data.
1Special tool
2Specified oil or fluid
3Specified engine speed
4Specified tightening torque
5Specified measurement
6Specified electrical value
(resistance, voltage, electric current)
Symbols 7to Cin an exploded diagram indicate the grade of lubricant and the lubrication point.
7Apply Yamaha 4-stroke motor oil
8Apply gear oil
9Apply water resistant grease (Yamaha grease A)
0Apply molybdenum disulfide grease
AApply corrosion resistant grease
(Yamaha grease D)
BApply low temperature resistant grease
(Yamaha grease C)
CApply injector grease
Symbols Dto Hin an exploded diagram indicate the type of sealant or locking agent and the appli-
cation point.
DApply Gasket Maker
EApply LOCTITE 271 (red)
FApply LOCTITE 242 (blue)
GApply LOCTITE 572
HApply silicon sealant
123456
T
R
.
.
7890ABC
E G
A M
D
C I
DEFGH
GM
271
LT
242
LT
572
LT SS
How to use this manual

GEN
INFO General information
1-3 6C13G11
Safety while working 1
To prevent an accident or injury and to
ensure quality service, follow the safety pro-
cedures provided below.
Fire prevention
Gasoline is highly flammable.
Keep gasoline and all flammable products
away from heat, sparks, and open flames.
Ventilation
Gasoline vapor and exhaust gas are heavier
than air and extremely poisonous. If inhaled
in large quantities they may cause loss of
consciousness and death within a short time.
When test running an engine indoors (e.g., in
a water tank) be sure to do so where ade-
quate ventilation can be maintained.
Self-protection
Protect your eyes by wearing safety glasses
or safety goggles during all operations involv-
ing drilling and grinding, or when using an air
compressor.
Protect your hands and feet by wearing pro-
tective gloves and safety shoes when neces-
sary.
Parts, lubricants, and sealants
Use only genuine Yamaha parts, lubricants,
and sealants or those recommended by
Yamaha, when servicing or repairing the out-
board motor.
Under normal conditions, the lubricants men-
tioned in this manual should not harm or be
hazardous to your skin. However, you should
follow these precautions to minimize any risk
when working with lubricants.
1. Maintain good standards of personal and
industrial hygiene.
2. Change and wash clothing as soon as
possible if soiled with lubricants.
3. Avoid contact with skin. Do not, for
example, place a soiled rag in your
pocket.
4. Wash hands and any other part of the
body thoroughly with soap and hot water
after contact with a lubricant or lubricant
soiled clothing has been made.
5. To protect your skin, apply a protective
cream to your hands before working on
the outboard motor.

6C13G11 1-4
1
2
3
4
5
6
7
8
9
6. Keep a supply of clean, lint-free cloths for
wiping up spills, etc.
Good working practices
Special service tools
Use the recommended special service tools
to protect parts from damage. Use the right
tool in the right manner—do not improvise.
Tightening torques
Follow the tightening torque specifications
provided throughout the manual. When tight-
ening nuts, bolts, and screws, tighten the
large sizes first, and tighten fasteners starting
in the center and moving outward.
Non-reusable parts
Always use new gaskets, seals, O-rings, cot-
ter pins, circlips, etc., when installing or
assembling parts.
Disassembly and assembly
1. Use compressed air to remove dust and
dirt during disassembly.
2. Apply engine oil to the contact surfaces
of moving parts before assembly.
3. Install bearings with the manufacture
identification mark in the direction indi-
cated in the installation procedure. In
addition, be sure to lubricate the bearings
liberally.
4. Apply a thin coat of water-resistant
grease to the lip and periphery of an oil
seal before installation.
5. Check that moving parts operate nor-
mally after assembly.
Identification 1
Applicable models
This manual covers the following models.
(*) Hydro tilt model (For Europe)
(*) Tiller handle model (For Oceania)
Applicable models
F50FED, F50FEHT, F50FET, FT50GET,
F60CEHT, F60CET, FT60DET
Safety while working / Identification

GEN
INFO General information
1-5 6C13G11
Serial number
The outboard motor serial number is
stamped on a label attached to the port
clamp bracket.
1Model name
2Approved model code
3Transom height
4Serial number
(*) Hydro tilt model (For Europe)
(*) Tiller handle model (For Oceania)
Model name Approved
model code
Starting
serial No.
F50FED
6C1 1000001–F50FEHT
F50FET
FT50GET 6C2 1000001–
F60CEHT 6C5 1000001–
F60CET
FT60DET 6C6 1000001–
S6C11010

6C13G11 1-6
1
2
3
4
5
6
7
8
9
Outline of features 1
New electronic fuel injected F50 and F60 outboard motors have a mainly redesigned fuel and intake
system based on the carbureted F60 outboard motor.
S6C11120
Power unit
•Single throttle body, single throttle valve
•Multi-point injection system, group injection
(#1/#4 and #2/#3)
•Group ignition system (#1/#4 and #2/#3)
•Large plastic intake manifold
•Compact plastic fuel rail
•Modularized intake system components
•Vapor separator with built-in pressure regulator
•Solenoid valve
•Fuel cooler
•Aluminum rocker arm
Electrical
•Compact electronic fuel injection system
•Self-diagnosis system and Yamaha Diagnostic
System
•Variable trolling RPM switch (optional for tiller
handle model)
•Throttle position sensor with learning function
(adjustment free)
•Compact charging system at low rpm
•Compact fuel injectors
•Fuel filter with water separator
Clamp bracket/upper case
•2-piece upper case
•Upper portion case with oil sump
•Big capacity water wall structure around muffler
•Idle exhaust labyrinth structure
•Exclusive clamp bracket for permanent mount-
ing
Lower unit
•Same lower drive unit as carbureted F60 model
Identification / Outline of features

GEN
INFO General information
1-7 6C13G11
Features and benefits 1
Fuel system
A pressure regulator is built into the vapor separator to obtain compact and simple fuel delivery
structure.
A plastic fuel rail is used to prevent it from corrosion and for light weight.
Fuel discharged from the pressure regulator returns to the vapor separator after cooling down
through the fuel cooler.
The fuel joint is used on the high pressure fuel hose to remove and/or install the intake unit easily.
S6C11130
Fuel filter (Optional) Fuel tank
Fuel cooler
Pressure regulator
Primer pump
Fuel filter with water separator
Fuel pump (Mechanical)
Fuel filter
Vapor separator
Electric fuel pump
Fuel rail
Fuel
injector
#1 #2 #3 #4
Fuel
injector
Fuel
injector Fuel injector

6C13G11 1-8
1
2
3
4
5
6
7
8
9
Solenoid valve
Just after the engine is stopped, the cooling water supply is also stopped and the heat is conducted
to the vapor separator from the engine, causing birth of many fuel vapor gases.
The vapor gases are fed into the intake silencer to reburn them.
However, many vapor gases are sucked into the combustion chambers, causing a rich air and fuel
mixture, which is difficult to restart the engine.
So the solenoid valve has been used for better restarting engine while the engine is warm.
The solenoid valve stops the vapor gases not to return into the intake silencer.
1Fuel tank
2Fuel filter
3Fuel pump
4Fuel cooler
5Return fuel hose
6Pressure regulator
7Solenoid valve
8To throttle body
9Fuel injector
0Electric fuel pump
AFuel filter
ÈFuel
ÉVapor gas
Features and benefits

GEN
INFO General information
1-9 6C13G11
Electronic control system
The electronic control system is built up by the sensors and the ECM (Electric control Module).
The ECM receives signals from the sensors and determines the air and fuel mixture (A/F), and igni-
tion timing.
Under various condition, the ECM gives the best-suitable engine operation.
In addition, warning control, fail-safe control, a self-diagnosis function, etc., are equipped to
increase reliability.
1Sensor assembly
(intake air temperature and intake air
pressure)
2ECM
3Throttle position sensor
4Oil pressure switch
5Cooling water temperature sensor
6Pulser coil
S6C11150
1
2
3
4
5
6

6C13G11 1-10
1
2
3
4
5
6
7
8
9
ECM (Electric Control Module)
This engine is controlled by the ECM to obtain precision combustion under various operations, and
can realize high power output, low fuel consumption, and low emission.
The ECM controls the ignition timing, fuel injection timing, and the fuel injection volume, and
ensures that the optimum ignition timing and air and fuel ratio can be achieved in all operating con-
ditions such as engine starting, normal operation, and quick acceleration.
The self-diagnosis function is incorporated into the ECM and can be easily found a malfunction
point by a personal computer with the optional software installed.
P
BZ
T
40
16
36
17
46
31
38
48
34
27
10
28
29
14
5
15
3
4
18
1
23
6
20
21
7
26
8
25
9
11
24
45
13
Pulser coil
Power source for sensors
Throttle position
sensor
Intake air pressure
sensor
Cooling water pressure sensor
Ground for sensors
Intake air temperature sensor
Cooling water temperature sensor
Shift position switch
Engine stop lanyard switch
Oil pressure switch
Variable trolling RPM switch (UP)
Variable trolling RPM switch
(DOWN)
Ground for ECM
Ground
Battery (+)
Fuel injectors #1, #4
Fuel injectors #2, #3
Ignition coil #1, #4
Ignition coil #2, #3
Idle speed control (S1)
Idle speed control (S2)
Idle speed control (S3)
Idle speed control (S4)
Tachometer
Oil pressure warning
indicator
Overheat warning
indicator
Check engine warning
indicator
Buzzer/DES switch
Solenoid valve
Fuel pump relay
Diagnosis
DES switch
Rectifier Regulator
Engine start switch
Battery
Flywheel
magnet
Main relay
–+
OUTPUTINPUT
Self-diagnosis
Main relay
Relay
Power for diagnosis lamp
S6C11160
Features and benefits

GEN
INFO General information
1-11 6C13G11
Variable trolling RPM switch (optional)
This device is an optional equipment for tiller handle model.
The idling and/or trolling rpm can be controlled in the range of 620 through 900 r/min with 50 r/min
interval.
Especially for 620 through 700 r/min, the engine rpm is controlled with 40 r/min interval.
Pushing and holding the switch changes rpm continuously at 50 r/min interval.
If engine rpm reaches to the ends of specified range, the rpm is no longer changed.
CAUTION:
Do not modify the variable trolling RPM switch.
Modification such as wire extension, disassembly, etc., can malfunction for the system and/
or damage the electrical components.
NOTE:
Variable trolling RPM switch kit P/N: 6C5-W8186-00
1Variable trolling RPM switch (optional)
S6C11170
1

6C13G11 1-12
1
2
3
4
5
6
7
8
9
Propeller selection 1
The performance of a boat and outboard
motor will be critically affected by the size
and type of propeller you choose. Propellers
greatly affect boat speed, acceleration,
engine life, fuel economy, and even boating
and steering capabilities. An incorrect choice
could adversely affect performance and
could also seriously damage the engine.
Use the following information as a guide for
selecting a propeller that meets the operating
conditions of the boat and the outboard
motor.
Propeller size
The size of the propeller is indicated on a
propeller blade, on the propeller boss end.
aPropeller diameter (in inches)
bPropeller pitch (in inches)
cPropeller type (propeller mark)
Selection
When the engine speed is at the full throttle
operating range (5,000–6,000 r/min), the
ideal propeller for the boat is one that pro-
vides maximum performance in relation to
boat speed and fuel consumption.
F50, F60
FT50, FT60
S69W1030
× -
abc
S69W1040
× -
abc
S69W1050
× -
abc
Propeller size (in) Material
10 ×15 - G
Aluminum
10 1/4 ×14 - G
10 3/8 ×13 - G
10 5/8 ×12 - G
10 3/4 ×16 - G
10 3/4 ×17 - G
11 ×15 - G
11 1/8 ×13 - G
11 1/4 ×14 - G
11 3/8 ×12 - G
11 5/8 ×11 - G
12 1/4 ×9 - G
10 1/4 ×14 - G
Stainless
10 1/4 ×15 - G
10 1/4 ×16 - G
10 5/8 ×13 - G
11 1/4 ×14 - G
11 1/2 ×13 - G
11 3/4 ×12 - G
12 ×11 - G
Propeller size (in) Material
14 ×11 - K Aluminum
Features and benefits / Propeller selection

GEN
INFO General information
1-13 6C13G11
Predelivery checks 1
To make the delivery process smooth and
efficient, the predelivery checks should be
completed as explained below.
Checking the fuel system
1. Check that the fuel hoses are securely
connected and that the fuel tank is full
with fuel.
CAUTION:
This is a 4-stroke engine. Never use pre-
mixed fuel.
Checking the engine oil level
1. Check the engine oil level.
NOTE:
If the engine oil is below the minimum level
mark b, add sufficient oil until the level is
between aand b.
Checking the gear oil level
1. Check the gear oil level.
Checking the battery
1. Check the capacity, electrolyte level, and
specified gravity of the battery.
2. Check that the positive and negative bat-
tery leads are securely connected.
S6C11030
b
a
Recommended engine oil:
4-stroke motor oil
API: SE, SF, SG, SH, or SJ
SAE: 10W-30 or 10W-40
Engine oil quantity:
Without oil filter replacement:
2.5 L (2.64 US qt, 2.20 Imp qt)
Recommended battery capacity:
CCA/EN: 430 A
20HR/IEC: 70 Ah
Electrolyte specified gravity:
1.280 at 20 °C (68 °F)
S60V1290

6C13G11 1-14
1
2
3
4
5
6
7
8
9
Checking the outboard motor
mounting height
1. Check that the anti-cavitation plate is
aligned with the bottom of the boat. If the
mounting height is too high, cavitation
will occur and propulsion will be reduced.
Also, the engine speed will increase
abnormally and cause the engine to
overheat. If the mounting height is too
low, water resistance will increase and
reduce engine efficiency.
NOTE:
The optimum mounting height is affected by
the combination of the boat and the outboard
motor. To determine the optimum mounting
height, test run the outboard motor at differ-
ent heights.
2. Check that the clamp brackets are
secured with the clamp bolts.
Checking the remote control cables
1. Set the remote control lever or shift lever
to the neutral position and fully close the
throttle lever or throttle grip.
2. Check that the set pin ais aligned with
the alignment mark b.
3. Check that the alignment mark cis
aligned with the mark d.
4. Check that the edge of a shift rod eis
aligned with the alignment mark fon
the bottom cowling.
WARNING
The shift/throttle cable joint must be
screwed in a minimum of 8.0 mm (0.31 in)
g.
Checking the steering system
1. Check the steering friction for proper
adjustment.
S6C11080
c
d
a
b
f
e
S6C11090
S6C11110
g
Predelivery checks

GEN
INFO General information
1-15 6C13G11
2. Check that the steering operates
smoothly.
ÈTiller handle model
ÉRemote control model
3. Check that there is no interference with
wires or hoses when the outboard motor
is steered.
Checking the gear shift and throttle
operation
1. Check that the gear shift operates
smoothly when the remote control lever
or shift lever is shifted from neutral to for-
ward or reverse.
2. Check that the throttle operates smoothly
when the throttle grip (tiller handle
model) is turned from the fully closed
position to the fully open position a.
Check that the throttle operates smoothly
when the remote control lever (remote
control model) is shifted from forward or
reverse to the fully open position a.
ÈTiller handle model
ÉRemote control model
Checking the power trim and tilt
system
1. Check that the outboard motor tilts up
and down smoothly when operating the
power trim and tilt unit.
2. Check that there is no abnormal noise
produced when the outboard motor is
tilted up or down.
3. Check that there is no interference with
wires or hoses when the tilted-up out-
board motor is steered.
4. Check that the trim meter points down
when the outboard motor is tilted all the
way down.
Checking the hydro tilt system
1. Check that the outboard motor tilts up
and down smoothly.
2. Fully tilt the outboard motor up, and then
lock the tilt stop lever 1to check the lock
mechanism of the hydro tilt. Replace the
hydro tilt unit if necessary.
È
É
È
S69J1210
F
N
R
a
a
É