2011 YAMAHA F225CA 4-STROKE OUTBOARD Service Repair Manual SN：1000001 and up

SERVICE MANUAL
LIT-18616-03-23 6CE-28197-1N-11
(L)F225
(L)F250
(L)F300

Preface
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 the Bronze Technical Certificate of the YTA
(Yamaha Technical Academy) marine or the equivalent 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. Also, up-to-date parts information is available on YDS (Yamaha Dealer System). Additional
information and up-to-date information on Yamaha products and services are available on YDS
(Yamaha Dealer System).
Important information
Particularly important information is distinguished in this manual by the following notations:
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED!
A WARNING indicates a hazardous situation which, if not avoided, could result in death or
serious injury.
A NOTICE indicates special precautions that must be taken to avoid damages to the out-
board motor or other property.
TIP:
A TIP provides key information to make procedures easier or clearer.
(L)F225, (L)F250, (L)F300
SERVICE MANUAL
©2010 by Yamaha Motor Corporation, U.S.A.
1st Edition, May 2010
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, U.S.A.
is expressly prohibited.
Printed in U.S.A.
LIT-18616-03-23

Contents
General information GEN
INFO 0
Specification SPEC 1
Technical features and description
TECH
FEA 2
Rigging information RIG
GING 3
Troubleshooting
TRBL
SHTG 4
Electrical system ELEC 5
Fuel system FUEL 6
Power unit POWR 7
Lower unit LOWR 8
Bracket unit BRKT 9
Maintenance MNT 10
Index
Appendix A

GEN
INFO
0
1
2
3
4
5
6
7
8
9
10
A
General information 0
Safety while working .................................................... 0-1
Rotating part .............................................................................. 0-1
Hot part ...................................................................................... 0-1
Electric shock ............................................................................ 0-1
Propeller .................................................................................... 0-1
Handling of gasoline .................................................................. 0-1
Ventilation .................................................................................. 0-1
Self-protection ........................................................................... 0-2
Working with crane .................................................................... 0-2
Handling of gas torch ................................................................ 0-2
Part, lubricant, and sealant ........................................................ 0-2
Handling of sealant .................................................................... 0-3
Special service tool ................................................................... 0-3
Tightening torque ...................................................................... 0-3
Non-reusable part ...................................................................... 0-3
Disassembly and assembly ....................................................... 0-3
How to use this manual .................................................... 0-4
Manual format ........................................................................... 0-4
Abbreviation .............................................................................. 0-5
Lubricant, sealant, and thread locking agent ................. 0-7
Symbol ...................................................................................... 0-7
Special service tool ........................................................... 0-9

0-1
GEN
INFO General information
Safety while working
To prevent an accident or injury and to pro-
vide quality service, observe the following
safety procedures.
Rotating part
• Hands, feet, hair, jewelry, clothing, personal
flotation device straps, and so on, can
become entangled with internal rotating
parts of the engine, resulting in serious
injury or death.
• Keep the top cowling installed whenever
possible. Do not remove or install the top
cowling when the engine is running.
• Only operate the engine with the top cowl-
ing removed according to the specific
instructions in the manual. Keep hands,
feet, hair, jewelry, clothing, personal flota-
tion device straps, and so on, away from
any exposed moving parts.
Hot part
During and after operation, engine parts are
hot enough to cause burns. Do not touch any
parts under the top cowling until the engine
has cooled.
Electric shock
Do not touch any electrical parts while start-
ing or operating the engine. Otherwise, shock
or electrocution could result.
Propeller
Do not hold the propeller with your hands
when loosening or tightening the propeller
nut.
Handling of gasoline
• Gasoline is highly flammable. Keep gaso-
line and all flammable products away from
heat, sparks, and open flames.
• Gasoline is poisonous and can cause injury
or death. Handle gasoline with care. Never
siphon gasoline by mouth. If you swallow
some gasoline, inhale a lot of gasoline
vapor, or get some gasoline in your eyes,
see your doctor immediately. If gasoline
spills on your skin, wash with soap and
water. If gasoline spills on your clothing,
change your clothes.
Ventilation
• Gasoline vapor and exhaust gas are
heavier than air and extremely poisonous. If
gasoline vapor or exhaust gas is inhaled in
large quantities, it may cause loss of con-
sciousness and death within a short time.
• When test running an engine indoors (for
example, in a water tank) make sure to do
so where adequate ventilation can be main-
tained.

0-2
Safety while working
0
1
2
3
4
5
6
7
8
9
10
A
Self-protection
• Protect your eyes by wearing safety
glasses or safety goggles during all opera-
tions involving drilling and grinding, or when
using an air compressor.
• Protect your hands and feet by wearing pro-
tective gloves and safety shoes when nec-
essary.
Working with crane
• Outboard motors weighing 18.0 kg (39.7 lb)
and over must be carried by a crane.
• Use the wire ropes of adequate strength,
and lift up the outboard motor using the
three-point suspension.
• If the outboard motor does not have three
or more points to be suspended, support it
using additional ropes, or the like, so that
the outboard motor can be lifted and carried
in a stable manner.
Handling of gas torch
• Improper handling of a gas torch may result
in burns. For information on the proper han-
dling of the gas torch, see the operation
manual issued by the manufacturer.
• When using a gas torch, keep it away from
the gasoline and oil, to prevent a fire.
• Components become hot enough to cause
burns. Do not touch any hot components
directly.
Part, lubricant, and sealant
Use only genuine Yamaha parts, lubricants,
and sealants, or those recommended by
Yamaha, when servicing or repairing the out-
board motor.

0-3
GEN
Handling of sealant
• Wear protective gloves to protect your skin,
when using the sealants.
• See the material safety data sheet issued
by the manufacturer. Some of the sealants
may be harmful to human health.
Special service tool
Use the recommended special service tools
to work safely, and to protect parts from dam-
age.
Tightening torque
When tightening nuts, bolts, and screws, fol-
low the tightening instructions provided
throughout the manual. If the tightening order
is not specified, tighten the large sizes first,
and then tighten the small sizes, starting from
the center and moving outward.
Non-reusable part
Always use new gaskets, seals, O-rings, cot-
ter pins, and so on, when installing or assem-
bling parts.
Disassembly and assembly
• Use compressed air to remove dust and dirt
during disassembly.
• Apply engine oil to the contact surfaces of
moving parts before assembly.
• Install bearings so that the bearing identifi-
cation mark is facing in the direction indi-
cated in the installation procedure. In
addition, make sure to lubricate the bear-
ings liberally.
• Apply a thin coat of water resistant grease
to the lip and periphery of an oil seal before
installation.
• Check that moving parts operate normally
after assembly.

0-4
How to use this manual
0
1
2
3
4
5
6
7
8
9
10
A
Manual format
The format of this manual has been designed to make service procedures clear and easy to under-
stand. Use the following information as a guide for effective and quality service.
• Parts are shown and detailed in an exploded diagram and are listed in the component list (see a
in the following figure for an example page).
• The component list consists of part names and quantities, as well as bolt and screw dimensions
(see b in the following figure).
• Symbols are used to indicate important aspects of a procedure, such as the grade of lubricant and
the lubrication points (see c in the following figure).
• Tightening torque specifications are provided in the exploded diagrams (see d in the following fig-
ure), and in the related detailed instructions. Some torque specifications are listed in stages as
torque figures or angles in degrees.
• Separate procedures and illustrations are used to explain the details of removal, checking, and
installation where necessary (see e in the following figure for an example page).
TIP:
For troubleshooting procedures, see Chapter 4, “Troubleshooting.”
Safety while working / How to use this manual

0-5
GEN
Abbreviation
The following abbreviations are used in this service manual.
Abbreviation Description
ABYC American Boat and Yacht Council
API American Petroleum Institute
ATDC After Top Dead Center
ATF Automatic Transmission Fluid
AWG American Wire Gauge
BTDC Before Top Dead Center
C/E Check Engine
CARB California Air Resources Board
CCA Cold Cranking Ampere
DN Down side
DOHC Double Over Head Camshaft
ECM Electronic Control Module
EPA Environmental Protection Agency
ETV Electronic Throttle Valve
ENG Engine
EX Exhaust
EXH Exhaust
F Forward
GPS Global Positioning System
ID Identification
IN Intake
INT Intake
ISO International Organization for Standardization
LPS Lever Position Sensor
MCA Marine Cranking Ampere
N Neutral
OCV Oil Control Valve
PCV Pressure Control Valve
PON Pump Octane Number
PORT Port side
PTT Power Trim and Tilt
R Reverse
RC Reserve Capacity
R.C. Remote Control (Digital Electronic Control)
SAE Society of Automotive Engineers
SPS Shift Position Sensor
STBD Starboard side
TCI Transistor-Controlled Ignition

0-6
0
1
2
3
4
5
6
7
8
9
10
A
TDC Top Dead Center
TPS Throttle Position Sensor
UP Up side
VCT Variable Camshaft Timing
W/F Water in Fuel
Y-COP Yamaha Customer Outboard Protection
YDIS Yamaha Diagnostic System
Abbreviation Description

0-7
GEN
Lubricant, sealant, and thread locking agent
Symbol
Symbols in an exploded diagram or illustration indicate the grade of lubricant and the lubrication
points.
Symbols in an exploded diagram or illustration indicate the type of sealant or thread locking agent
and the application points.
Symbol Name Application
Yamaha 4-stroke motor oil Lubricant
Gear oil Lubricant
Water resistant grease
(Yamaha grease A)
Lubricant
Molybdenum disulfide grease Lubricant
Corrosion resistant grease
(Yamaha grease D)
Lubricant
Low temperature resistant grease
(Yamaha grease C)
Lubricant
WR-No.2 grease Lubricant
Gasket Maker Sealant
ThreeBond 1280B Sealant
ThreeBond 1303 Thread locking agent
ThreeBond 1303N Thread locking agent
ThreeBond 1322 Thread locking agent
ThreeBond 1377B Thread locking agent

0-8
Lubricant, sealant, and thread locking agent
0
1
2
3
4
5
6
7
8
9
10
A
ThreeBond 1386B Sealant
ThreeBond 1530D Sealant
LOCTITE 210 (red) Thread locking agent
LOCTITE 242 (blue) Thread locking agent
LOCTITE 271 (red) Thread locking agent
LOCTITE 572 (white) Sealant
Silicone sealant Sealant

0-9
GEN
For U.S.A. and Canada
Special service tools numbered “YB-*****” are distributed by K & L.
Special service tools with Yamaha part numbers (90890-*****) are distributed by the Parts Division.
Engine lifting eye
90890-06820
Drilling plate
90890-06783
YDIS (CD-ROM, Ver. 1.33)
60V-WS853-06
YDIS USB adapter and cable
60V-WS850-00
Digital multimeter
YU-34899-A
Peak volt adapter
YU-39991
Test harness (3 pins)
YB-06869
Pressure/vacuum tester
YB-35956-A
Test harness (1 pin)
YB-06888
YB-06887

0-10
0
1
2
3
4
5
6
7
8
9
10
A
Spark checker
YM-34487
YB-06867
YB-06791
Fuel pressure gauge adapter
YW-06842
Fuel pressure gauge
YB-06766
Vacuum/pressure pump gauge set
90890-06756
Compression gauge
YU-33223
Balance hanger
90890-06822
Universal magneto and rotor holder
YU-01235
Primary sheave holder
YS-01880-A

0-11
GEN
Valve spring compressor
YM-04019
Valve attachment
YB-06320
Valve guide remover
YB-06801
Valve guide reamer
YM-01196
Valve lapper
YM-A8998
Neway valve seat kit
YB-91044
Oil filter wrench
90890-06830
Driver handle (large)
YB-06071
Roller bearing installer/remover
YB-06432
Needle bearing installer
YB-06111

0-12
0
1
2
3
4
5
6
7
8
9
10
A
Piston ring compressor
YM-08037
Driveshaft needle bearing installer and
remover
YB-06196
Shift rod socket
90890-06679
Bearing housing bearing/oil seal remover
YB-06112
Ring nut wrench extension
90890-06513
Ring nut wrench 6
90890-06677
Universal puller
YB-06117
Bearing housing puller
YB-06207
Bearing cup installer
YB-06167
Driveshaft bearing installer
YB-06155

0-13
GEN
Bearing inner race attachment
90890-06661
Forward gear needle bearing installer
YB-06261
YB-06246
Drive shaft ring nut wrench
90890-06674
Drive shaft holder
YB-06520
Pinion nut holder
90890-06715
Driver rod L3
90890-06652
Needle bearing attachment
90890-06680
Bearing inner race attachment
90890-06640
YB-06246

0-14
0
1
2
3
4
5
6
7
8
9
10
A
Pinion gear bushing installer
YB-06029-2
Roller bearing installer/remover
YB-06432-2
Bearing installer
YB-06016
Backlash indicator
90890-06836
Dial indicator gauge
YU-03097
Backlash adjustment plate
YB-07003
Magnetic base stand
YU-A8438
Pinion shimming gauge
90890-06675
Pinion shimming gauge rod
90890-06676
Slide hammer
YB-06096

0-15
GEN
Propeller shaft and bearing housing
remover
YB-06335
Needle bearing attachment
90890-06607
Gland nut wrench
YB-06578
Prop shaft/bearing installer
YB-42225
Forward gear bearing installer
YB-06345
Drive handle (small)
YB-06229
PTT pressure gauge
YB-06580
Bearing splitter plates
YU-35557
PTT cylinder wrench
YB-06175-2B
PTT piston vice tool
YB-06572

0-16
0
1
2
3
4
5
6
7
8
9
10
A
Tilt rod wrench
YB-06569

SPEC
Specification 1
Model feature ..................................................................... 1-1
General feature ......................................................................... 1-1
Model designation ..................................................................... 1-2
Serial number ............................................................................ 1-2
Model data ......................................................................... 1-3
Dimension and weight ............................................................... 1-3
Performance .............................................................................. 1-3
Power unit ................................................................................. 1-4
Lower unit .................................................................................. 1-5
Bracket unit ............................................................................... 1-5
Fuel and oil requirement ............................................................ 1-6
Battery requirement ................................................................... 1-7
PTT fluid requirement ................................................................ 1-7
Electrical system technical data ...................................... 1-8
Ignition timing control system .................................................... 1-8
Fuel injection control system ................................................... 1-10
Engine speed control system .................................................. 1-11
VCT system ............................................................................. 1-12
Shift actuator ........................................................................... 1-13
PTT system ............................................................................. 1-13
Charging system ..................................................................... 1-14
Starting system ........................................................................ 1-14
Gauge/sensor .......................................................................... 1-15
Fuel system technical data ............................................ 1-17
Fuel system ............................................................................. 1-17
Power unit technical data ............................................... 1-18
Power unit ............................................................................... 1-18
Cylinder head assembly .......................................................... 1-19
Crankcase assembly ............................................................... 1-21
Lower unit technical data ............................................... 1-24
Lower unit assembly (regular rotation model) ......................... 1-24
Lower unit assembly (counter rotation model) ........................ 1-24
Bracket unit technical data ............................................ 1-25
PTT system ............................................................................. 1-25
Specified tightening torque ............................................ 1-26
Rigging information ................................................................. 1-26
Fuel system ............................................................................. 1-26
Power unit ............................................................................... 1-26

0
1
2
4
5
6
7
8
9
10
A
Lower unit (regular rotation model) ......................................... 1-27
Lower unit (counter rotation model) ......................................... 1-28
Bracket unit ............................................................................. 1-28
PTT unit ................................................................................... 1-29
General tightening torque .............................................. 1-30

1-1
SPEC
Specification
Model feature
General feature
(L)F225CA, (L)F250CA, and (L)F300CA overall feature
• Newly developed 60° V6, DOHC, 24-valve, 4-stroke 4169.0 cm3 (254.4 cu. in) engine
• Low exhaust emissions conform to US EPA and CARB 3-STAR regulations, and permeation emis-
sions from exterior fuel hoses conform to EPA regulations
• All models can use Command Link Plus
• Y-COP (optional)
a Power unit
• Plastic cylinder head covers
• Shimless valve lifters
• Large diameter intake valve heads
• Cylinder heads with integrated exhaust
cover
• Crankcase and oil filter bracket with oil
cooler
• Crankshaft with integrated drive sprocket
• Sleeveless cylinders
• Compact VCT assemblies with narrow tim-
ing belt
• Blowby gas reburning system
• Vapor gas treatment
b Electrical
• Electronic fuel injection control
• Ignition timing control
• VCT control
• Knock control
• Engine speed control
• ETV control
• Electronic shift control
• Fail-safe control
• New YDIS 1.33 version
• Multi-engine system for alert mode and
auto engine speed synchronization
• Adjusting trolling speed function
• High-output stator assembly
• Isolator for house (accessory) battery
• Water-cooled Rectifier Regulator
c Bracket unit
• Same type of bracket as F250
• Same type of PTT unit as F250
d Upper case
• Lightweight bottom cowling
• Vibration reduction mounting
• Water-sealed outer wall
e Lower unit
• Dual water inlets
• Drive shaft with a double taper roller bear-
ing
• Propeller shaft with 3 bearings (regular
rotation model)
• Propeller damper cooling system
• Patented shift damper system
a
d
b
e
c

1-2
Model feature
0
1
2
3
4
5
6
7
8
9
10
A
Model designation
Serial number
The outboard motor serial number is indi-
cated on a label affixed to the port clamp
bracket.
a Model name
b Approved model code
c Transom height
d Serial number
e Model year code
a Model description
F: 4-stroke regular rotation
LF: 4-stroke counter rotation
b Model name 300: 225/250/300
c Transom height
X: UL (25 in)
U: SUL (30 in)
d
Functions
Blank: PTT and electric starter
e C: Command Link Control
f Product generation A: A and later
F 300 X C A
ba c d e f
YAMAHA MOTOR CO., LTD.
MADE IN JAPAN
PAYS D'ORIGINE JAPON
a
b
c
d
e
Model name
Approved
model code
Starting
serial No.
F225CA 6CL 1000001–
LF225CA 6CM 1000001–
F250CA 6CG 1000001–
LF250CA 6CH 1000001–
F300CA 6CE 1000001–
LF300CA 6CF 1000001–

1-3
SPEC
Specification
Model data
Dimension and weight
Performance
Item Unit
Model
F225CA LF225CA F250CA LF250CA
Overall length mm (in) 958.0 (37.7)
Overall width mm (in) 634.0 (25.0)
Overall height
X mm (in) 1890.0 (74.4)
U mm (in)
2017.0
(79.4)
— 2017.0 (79.4)
Boat transom height
X mm (in) 643 (25.3)
U mm (in)
770.0
(30.3)
— 770.0 (30.3)
Weight (without propeller)
X kg (lb) 260.0 (573)
U kg (lb)
268.0
(591)
— 268.0 (591)
Item Unit
Model
F300CA LF300CA
Overall length mm (in) 958.0 (37.7)
Overall width mm (in) 634.0 (25.0)
Overall height
X mm (in) 1890.0 (74.4)
U mm (in) 2017.0 (79.4)
Boat transom height
X mm (in) 643.0 (25.3)
U mm (in) 770.0 (30.3)
Weight (without propeller)
X kg (lb) 260.0 (573)
U kg (lb) 268.0 (591)
Item Unit
Model
Maximum output
At 5500 r/min kW (HP) 165.5 (225) 183.8 (250)
Full throttle operating range r/min 5000–6000
Maximum fuel consumption
At 5500 r/min
L (US gal,
Imp gal)/hr
81.0 (21.4, 17.8) 91.0 (24.0, 20.0)
Engine idle speed r/min 650–750
Item Unit
Model
F300CA LF300CA
Maximum output
At 5500 r/min kW (HP) 220.6 (300)
Full throttle operating range r/min 5000–6000

1-4
Model data
0
1
2
3
4
5
6
7
8
9
10
A
Power unit
Maximum fuel consumption
At 5500 r/min
L (US gal,
Imp gal)/hr
97.0 (25.6, 21.3)
Engine idle speed r/min 650–750
Item Unit
Model
Type 4-stroke, DOHC
Cylinder quantity V6
Total displacement cm3 (cu. in) 4169.0 (254.4)
Bore stroke mm (in) 96.0 96.0 (3.78 3.78)
Compression ratio 10.3:1
Control system Digital Electronic Control
Starting system Electric
Fuel system Fuel injection
Ignition control system TCI
Advance type Microcomputer
Maximum generator output V, A 12.0, 70.0
Spark plug LFR6A-11 (NGK)
Firing order 1–2–3–4–5–6 (normal operation)
Cooling system Water
Exhaust system Propeller boss
Lubrication system Wet sump
Item Unit
Model
F300CA LF300CA
Type 4-stroke, DOHC
Cylinder quantity V6
Total displacement cm³ (cu. in) 4169.0 (254.4)
Bore stroke mm (in) 96.0 96.0 (3.78 3.78)
Compression ratio 10.3:1
Control system Digital Electronic Control
Starting system Electric
Fuel system Fuel injection
Ignition control system TCI
Advance type Microcomputer
Maximum generator output V, A 12.0, 70.0
Spark plug LFR6A-11 (NGK)
Firing order 1–2–3–4–5–6 (normal operation)
Cooling system Water
Exhaust system Propeller boss
Lubrication system Wet sump
Item Unit
Model
F300CA LF300CA

1-5
SPEC
Specification
Lower unit
Bracket unit
Item Unit
Model
Gear shift positions F–N–R
Gear ratio 1.75 (21/12)
Reduction gear type Spiral bevel gear
Clutch type Dog clutch
Propeller shaft type Spline
Propeller direction (rear view)
Clock-
wise
Counter
clockwise
Clock-
wise
Counter
clockwise
Propeller mark T TL T TL
Item Unit
Model
F300CA LF300CA
Gear shift positions F–N–R
Gear ratio 1.75 (21/12)
Reduction gear type Spiral bevel gear
Clutch type Dog clutch
Propeller shaft type Spline
Propeller direction (rear view) Clockwise Counter clockwise
Propeller mark T TL
Item Unit
Model
Trim angle
At 12º boat transom degree –3 to 16
Tilt-up angle degree 67
Steering angle degree 32 + 32
Trim and tilt system PTT
Item Unit
Model
F300CA LF300CA
Trim angle
At 12º boat transom degree –3 to 16
Tilt-up angle degree 67
Steering angle degree 32 + 32
Trim and tilt system PTT

1-6
Model data
0
1
2
3
4
5
6
7
8
9
10
A
Fuel and oil requirement
(*1) If the recommended engine oil grades are not available, use engine oil with an API classification
of SH, SJ, or SL and an SAE classification of 15W-40, 20W-40, or 20W-50.
(*2) Meeting both API and SAE requirements.
(*1) If the recommended engine oil grades are not available, use engine oil with an API classification
of SH, SJ, or SL and an SAE classification of 15W-40, 20W-40, or 20W-50.
(*2) Meeting both API and SAE requirements.
Item Unit
Model
Fuel type Regular unleaded gasoline
Minimum fuel octane number PON 87
Engine oil
YAMALUBE 4-M FC-W oil or 4-stroke motor oil
with combination of the following SAE and API
oil classifications
Engine oil grade (*1)
API SE, SF, SG, SH, SJ, SL
SAE 5W-30, 10W-30, 10W-40
Total engine oil quantity (oil pan
capacity)
L (US qt,
Imp qt)
7.1 (7.50, 6.25)
Gear oil type Hypoid gear oil
Gear oil grade (*2)
API GL-5
SAE 90, 80W-90
Gear oil quantity
L (US qt,
Imp qt)
1.040 (1.10, 0.92)
Item Unit
Model
F300CA LF300CA
Fuel type Premium unleaded gasoline
Minimum fuel octane number PON 89
Engine oil
YAMALUBE 4-M FC-W oil or 4-stroke motor oil
with combination of the following SAE and API
oil classifications
Engine oil grade (*1)
API SE, SF, SG, SH, SJ, SL
SAE 5W-30, 10W-30, 10W-40
Total engine oil quantity (oil pan
capacity)
L (US qt,
Imp qt)
7.1 (7.50, 6.25)
Gear oil type Hypoid gear oil
Gear oil grade (*2) API GL-5
SAE 90, 80W-90
Gear oil quantity
L (US qt,
Imp qt)
1.040 (1.10, 0.92)

1-7
SPEC
Specification
Battery requirement
PTT fluid requirement
Item Unit
Model
F225FET FL225FET F250DET FL250DET
Minimum cold cranking amps
CCA/SAE A 680.0
Minimum marine cranking amps
MCA/ABYC A 770.0
Minimum reserve capacity
RC/SAE minutes 160
Item Unit
Model
F300CA LF300CA
Minimum cold cranking amps
CCA/SAE A 680.0
Minimum marine cranking amps
MCA/ABYC A 770.0
Minimum reserve capacity
RC/SAE minutes 160
Item Unit
Model
Fluid type ATF DEXRON II
Item Unit
Model
F300CA LF300CA
Fluid type ATF DEXRON II

1-8
Electrical system technical data
0
1
2
3
4
5
6
7
8
9
10
A
Ignition timing control system
(*1) The figures are for reference only.
Item Unit
Model
Spark plug
Gap mm (in) 1.0–1.1 (0.039–0.043)
Cam position sensor
Input voltage V 12.0
Ignition coil
Pulser coil
Air gap mm (in) 0.4–1.1 (0.016–0.043)
Output peak voltage
At cranking (unloaded) V 7.6
At cranking (loaded) V 6.9
At 1500 r/min (loaded) V 23.9
Resistance
At 20 °C (68 °F) Ω 396.0–594.0
Air temperature sensor
Input voltage V 4.75–5.25
Resistance (*1)
At 20 °C (68 °F) kΩ 2.21–2.69
At 80 °C (176 °F) kΩ 0.32
Air pressure sensor
Output voltage (*1)
At –20.0 kPa (–0.20 kgf/
cm2, –2.9 psi)
V 3.21
At –46.7 kPa (–0.467 kgf/
cm2, –6.8 psi)
V 2.16
Engine temperature sensor
Resistance (*1)
At 5 °C (41 °F) kΩ 4.2–4.9
At 25 °C (77 °F) kΩ 1.9–2.1
At 100 °C (212 °F) kΩ 0.166–0.204
Thermoswitch
Temperature
Switch ON °C (°F) 84–90 (183–194)
Switch OFF °C (°F) 68–82 (154–180)
Knock sensor
Resistance
At 20 °C (68 °F) kΩ 504.0–616.0
Model data / Electrical system technical data

1-9
SPEC
Specification
Item Unit
Model
F300CA LF300CA
Spark plug
Gap mm (in) 1.0–1.1 (0.039–0.043)
Cam position sensor
Ignition coil
Pulser coil
Air gap mm (in) 0.4–1.1 (0.016–0.043)
Output peak voltage
At cranking (loaded) V 6.9
Resistance
At 20 °C (68 °F) Ω 396.0–594.0
Resistance (*1)
At 20 °C (68 °F) kΩ 2.21–2.69
At 80 °C (176 °F) kΩ 0.32
Air pressure sensor
Output voltage (*1)
At –20.0 kPa (–0.20 kgf/
cm2, –2.9 psi)
V 3.21
At –46.7 kPa (–0.467 kgf/
cm2, –6.8 psi)
V 2.16
Resistance (*1)
At 5 °C (41 °F) kΩ 4.2–4.9
At 25 °C (77 °F) kΩ 1.9–2.1
At 100 °C (212 °F) kΩ 0.166–0.204
Thermoswitch
Temperature
Switch ON °C (°F) 84–90 (183–194)
Switch OFF °C (°F) 68–82 (154–180)
Knock sensor
Resistance
At 20 °C (68 °F) kΩ 504.0–616.0

1-10
0
1
2
3
4
5
6
7
8
9
10
A
Fuel injection control system
Item Unit
Model
Fuel line
Pressure (*1)
Within 5 seconds after
engine start switch turned
to ON
kPa (kgf/
cm2, psi)
330.0 (3.30, 47.9)
At 700 r/min
kPa (kgf/
cm2, psi)
280.0 (2.80, 40.6)
Water detection switch
Float height (*1) mm (in) 53.0 (2.10)
Fuel injector
Resistance (*1)
At 20 °C (68 °F) Ω 11.5–12.5
Low-pressure fuel pump
Resistance (*1)
At 20 °C (68 °F) Ω 0.5–4.0
High-pressure fuel pump
Resistance (*1)
At 20 °C (68 °F) Ω 0.2–3.0
Vapor shut-off valve
Resistance
At 20 °C (68 °F) Ω 30.0–34.0
Item Unit
Model
F300CA LF300CA
Fuel line
Pressure (*1)
Within 5 seconds after
engine start switch turned
to ON
kPa (kgf/
cm2, psi)
330.0 (3.30, 47.9)
At 700 r/min
kPa (kgf/
cm2, psi)
280.0 (2.80, 40.6)
Water detection switch
Float height (*1) mm (in) 53.0 (2.10)
Fuel injector
Resistance (*1)
At 20 °C (68 °F) Ω 11.5–12.5

1-11
SPEC
Specification
Engine speed control system
Resistance (*1)
At 20 °C (68 °F) Ω 0.5–4.0
High-pressure fuel pump
Resistance (*1)
At 20 °C (68 °F) Ω 0.2–3.0
Vapor shut-off valve
Resistance
At 20 °C (68 °F) Ω 30.0–34.0
Item Unit
Model
TPS
Output voltage (*1)
With throttle valve fully
closed
TPS1 V 0.37–0.63
TPS2 V 2.5–3.5
Throttle valve opening angle
(*1)
closed
degree 4.5
SPS
Output voltage
F V 0.2–1.5
N V 2.412–2.588
R V 3.5–4.8
Oil pressure sensor
Output voltage (*1)
At 392.0 kPa (3.92 kgf/cm2,
56.8 psi)
V 2.5
At 784.0 kPa (7.84 kgf/cm2,
113.7 psi)
V 4.5
Item Unit
Model
F300CA LF300CA

1-12
0
1
2
3
4
5
6
7
8
9
10
A
VCT system
Item Unit
Model
F300CA LF300CA
TPS
Output voltage (*1)
closed
TPS1 V 0.37–0.63
TPS2 V 2.5–3.5
Throttle valve opening angle
(*1)
closed
degree 4.5
SPS
Output voltage
F V 0.2–1.5
N V 2.412–2.588
R V 3.5–4.8
Oil pressure sensor
Output voltage (*1)
At 392.0 kPa (3.92 kgf/cm2,
56.8 psi)
V 2.5
At 784.0 kPa (7.84 kgf/cm2,
113.7 psi)
V 4.5
Item Unit
Model
OCV
Resistance
At 20 °C (68 °F) Ω 6.7–7.7
Item Unit
Model
F300CA LF300CA
OCV
Resistance
At 20 °C (68 °F) Ω 6.7–7.7

1-13
SPEC
Specification
Shift actuator
PTT system
Item Unit
Model
Shift actuator
Rod stroke (*1)
F mm (in) 78.2 (3.08)
N mm (in) 59.2 (2.33)
R mm (in) 41.1 (1.62)
Motor resistance (*1)
At 20 °C (68 °F) Ω 1.7
Item Unit
Model
F300CA LF300CA
Shift actuator
Rod stroke (*1)
F mm (in) 78.2 (3.08)
N mm (in) 59.2 (2.33)
R mm (in) 41.1 (1.62)
Motor resistance (*1)
At 20 °C (68 °F) Ω 1.7
Item Unit
Model
Trim sensor
Free position resistance Ω 247.6–387.6
Setting resistance Ω 9.0–11.0
Item Unit
Model
F300CA LF300CA
Trim sensor
Free position resistance Ω 247.6–387.6
Setting resistance Ω 9.0–11.0

1-14
0
1
2
3
4
5
6
7
8
9
10
A
Charging system
Starting system
Item Unit
Model
Lighting coil
Output peak voltage
At 1500 r/min (unloaded) V 38.0
Resistance (*1)
At 20 °C (68 °F) Ω 0.1056–0.1584
Fuse A 100
Rectifier Regulator
Output peak voltage
Item Unit
Model
F300CA LF300CA
Lighting coil
Output peak voltage
Resistance (*1)
At 20 °C (68 °F) Ω 0.1056–0.1584
Fuse A 100
Rectifier Regulator
Output peak voltage
Item Unit
Model
Y-COP
Starter motor
Type Sliding gear
Output kW 1.70
Cranking time limit second 30
Commutator
Standard diameter mm (in) 29.0 (1.14)
Wear limit mm (in) 28.0 (1.10)
Standard undercut mm (in) 0.5–0.8 (0.02–0.03)

1-15
SPEC
Specification
Gauge/sensor
Brush
Standard length mm (in) 15.5 (0.61)
Item Unit
Model
F300CA LF300CA
Y-COP
Input voltage 12.0
Starter motor
Type Sliding gear
Output kW 1.70
Cranking time limit second 30
Commutator
Standard undercut mm (in) 0.5–0.8 (0.02–0.03)
Brush
Item Unit
Model
Water pressure sensor
Output voltage (*1)
At 392.0 kPa (3.92 kgf/cm2,
56.8 psi)
V 2.5
At 784.0 kPa (7.84 kgf/cm2,
113.7 psi)
V 4.5
Speed sensor
Output voltage (*1)
At 392.0 kPa (3.92 kgf/cm2,
56.8 psi)
V 2.5
At 784.0 kPa (7.84 kgf/cm2,
113.7 psi)
V 4.5
Item Unit
Model

1-16
0
1
2
3
4
5
6
7
8
9
10
A
Item Unit
Model
F300CA LF300CA
Water pressure sensor
Output voltage (*1)
At 392.0 kPa (3.92 kgf/cm2,
56.8 psi)
V 2.5
At 784.0 kPa (7.84 kgf/cm2,
113.7 psi)
V 4.5
Speed sensor
Output voltage (*1)
At 392.0 kPa (3.92 kgf/cm2,
56.8 psi)
V 2.5
At 784.0 kPa (7.84 kgf/cm2,
113.7 psi)
V 4.5

1-17
SPEC
Specification
Fuel system technical data
Fuel system
Item Unit
Model
Fuel filter assembly
Holding pressure
Positive pressure
kPa (kgf/
cm2, psi)
200.0 (2.00, 29.0)
Negative pressure
kPa (kgf/
cm2, psi)
80.0 (0.80, 11.6)
Canister
Holding pressure
Positive pressure
kPa (kgf/
cm2, psi)
19.6 (0.196, 2.8)
Primer pump
Holding pressure
Positive pressure
kPa (kgf/
cm2, psi)
170.0 (1.70, 24.7)
Vapor separator tank
Float height mm (in) 67.5 ± 2.5 (2.66 ± 0.10)
Item Unit
Model
F300CA LF300CA
Fuel filter assembly
Holding pressure
Positive pressure
kPa (kgf/
cm2, psi)
200.0 (2.00, 29.0)
Negative pressure
kPa (kgf/
cm2, psi)
80.0 (0.80, 11.6)
Canister
Holding pressure
Positive pressure
kPa (kgf/
cm2, psi)
19.6 (0.196, 2.8)
Primer pump
Holding pressure
Positive pressure
kPa (kgf/
cm2, psi)
170.0 (1.70, 24.7)
Vapor separator tank
Float height mm (in) 67.5 ± 2.5 (2.66 ± 0.10)

1-18
Power unit technical data
0
1
2
3
4
5
6
7
8
9
10
A
Power unit
(*1) Measuring conditions: Ambient temperature 20 °C (68 °F), with spark plugs removed from all
cylinders. The figures are for reference only.
(*2) For the checking method, see “Checking the oil pressure” (7-1). The figures are for reference
only.
Item Unit
Model
Compression pressure
Minimum (*1)
kPa (kgf/
cm2, psi)
700.0 (7.00, 101.5)
Engine oil
Oil pressure (*2)
At 60 °C (140 °F) with SL
10W-30 engine oil and at
750 r/min
kPa (kgf/
cm2, psi)
350.0 (3.50, 50.8)
3000 r/min
kPa (kgf/
cm2, psi)
590.0 (5.90, 85.6)
Timing belt
Installation height mm (in) 2.5 (0.10)
Thermostat
Valve opening temperature °C (°F) 50.0–54.0 (122.0–129.0)
Fully open temperature °C (°F) 62.0 (144.0)
Fully open stroke mm (in) 4.3 (0.17)
Replacement engine oil quan-
tity (at periodic maintenance)
Without oil filter replacement
L (US qt,
Imp qt)
6.0 (6.34, 5.28)
With oil filter replacement
L (US qt,
Imp qt)
6.3 (6.66, 5.54)
Item Unit
Model
F300CA LF300CA
Compression pressure
Minimum (*1)
kPa (kgf/
cm2, psi)
700.0 (7.00, 101.5)
Engine oil
Oil pressure (*2)
750 r/min
kPa (kgf/
cm2, psi)
350.0 (3.50, 50.8)
3000 r/min
kPa (kgf/
cm2, psi)
590.0 (5.90, 85.6)
Timing belt
Installation height mm (in) 2.5 (0.10)
Fuel system technical data / Power unit technical data

1-19
SPEC
Specification
(*1) Measuring conditions: Ambient temperature 20 °C (68 °F), with spark plugs removed from all
cylinders. The figures are for reference only.
(*2) For the checking method, see “Checking the oil pressure” (7-1). The figures are for reference
only.
Cylinder head assembly
Thermostat
Valve opening temperature °C (°F) 50.0–54.0 (122.0–129.0)
Fully open temperature °C (°F) 62.0 (144.0)
Fully open stroke mm (in) 4.3 (0.17)
Replacement engine oil quan-
tity (at periodic maintenance)
Without oil filter replacement
L (US qt,
Imp qt)
6.0 (6.34, 5.28)
With oil filter replacement
L (US qt,
Imp qt)
6.3 (6.66, 5.54)
Item Unit
Model
Valve lifter
Outside diameter mm (in) 30.970–30.980 (1.2193–1.2197)
Valve lifter clearance mm (in) 0.020–0.055 (0.0008–0.0022)
Camshaft
Cam lobe height
Intake mm (in) 46.661–46.761 (1.8370–1.8410)
Exhaust mm (in) 46.960–47.060 (1.8488–1.8528)
Cam lobe width
Intake and exhaust mm (in) 35.950–36.050 (1.4154–1.4193)
Journal diameter mm (in) 24.960–24.980 (0.9827–0.9835)
Runout mm (in) 0.030 (0.0012)
Cylinder head
Warpage limit mm (in) 0.10 (0.0039)
Journal inside diameter mm (in) 25.000–25.021 (0.9843–0.9851)
Valve spring
Free length mm (in) 48.1 (1.89)
Tilt limit mm (in) 1.7 (0.07)
Valve
Clearance
Intake mm (in) 0.205 ± 0.035 (0.0081 ± 0.0014)
Exhaust mm (in) 0.345 ± 0.035 (0.0136 ± 0.0014)
Seat contact width
Intake mm (in) 1.100–1.400 (0.0433–0.0551)
Exhaust mm (in) 1.400–1.700 (0.0551–0.0669)
Margin thickness
Intake mm (in) 0.750–1.150 (0.0295–0.0453)
Exhaust mm (in) 0.900–1.300 (0.0354–0.0512)
Item Unit
Model
F300CA LF300CA

1-20
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1
2
3
4
5
6
7
8
9
10
A
Valve stem
Diameter
Intake mm (in) 5.477–5.492 (0.2156–0.2162)
Exhaust mm (in) 5.464–5.479 (0.2151–0.2157)
Runout
Intake and exhaust mm (in) 0.01 (0.0004)
Valve guide
Inside diameter
Valve guide clearance
Intake mm (in) 0.012–0.045 (0.0005–0.0018)
Exhaust mm (in) 0.025–0.058 (0.0010–0.0023)
Installation height mm (in) 11.300–11.700 (0.4449–0.4606)
Item Unit
Model
F300CA LF300CA
Valve lifter
Outside diameter mm (in) 30.970–30.980 (1.2193–1.2197)
Valve lifter clearance mm (in) 0.020–0.055 (0.0008–0.0022)
Camshaft
Cam lobe height
Intake mm (in) 46.661–46.761 (1.8370–1.8410)
Exhaust mm (in) 46.960–47.060 (1.8488–1.8528)
Cam lobe width
Runout mm (in) 0.030 (0.0012)
Cylinder head
Warpage limit mm (in) 0.10 (0.0039)
Journal inside diameter mm (in) 25.000–25.021 (0.9843–0.9851)
Valve spring
Free length mm (in) 48.1 (1.89)
Tilt limit mm (in) 1.7 (0.07)
Valve
Clearance
Intake mm (in) 0.205 ± 0.035 (0.0081 ± 0.0014)
Exhaust mm (in) 0.345 ± 0.035 (0.0136 ± 0.0014)
Seat contact width
Intake mm (in) 1.100–1.400 (0.0433–0.0551)
Exhaust mm (in) 1.400–1.700 (0.0551–0.0669)
Margin thickness
Intake mm (in) 0.750–1.150 (0.0295–0.0453)
Exhaust mm (in) 0.900–1.300 (0.0354–0.0512)
Item Unit
Model

1-21
SPEC
Specification
Crankcase assembly
Valve stem
Diameter
Intake mm (in) 5.477–5.492 (0.2156–0.2162)
Exhaust mm (in) 5.464–5.479 (0.2151–0.2157)
Runout
Intake and exhaust mm (in) 0.01 (0.0004)
Valve guide
Inside diameter
Valve guide clearance
Intake mm (in) 0.012–0.045 (0.0005–0.0018)
Exhaust mm (in) 0.025–0.058 (0.0010–0.0023)
Installation height mm (in) 11.300–11.700 (0.4449–0.4606)
Item Unit
Model
Piston
Diameter mm (in) 95.945–95.960 (3.7774–3.7779)
Measuring point mm (in) 13.500 (0.5315)
Piston clearance mm (in) 0.040–0.067 (0.0016–0.0026)
Ring groove (top) mm (in) 1.230–1.250 (0.0484–0.0492)
Ring groove (2nd) mm (in) 1.220–1.240 (0.0480–0.0488)
Ring groove (oil) mm (in) 2.510–2.530 (0.0988–0.0996)
Pin boss inside diameter mm (in) 22.011–22.018 (0.8666–0.8668)
Pin outside diameter mm (in) 21.996–22.005 (0.8660–0.8663)
Cylinder
Bore mm (in) 96.000–96.012 (3.7795–3.7800)
Piston ring
Top ring
Type Barrel
Dimension height (B) mm (in) 1.200 (0.0472)
Dimension width (T) mm (in) 2.800–3.000 (0.1102–0.1181)
End gap (*1) mm (in) 0.200–0.300 (0.0079–0.0118)
Side clearance mm (in) 0.030–0.050 (0.0012–0.0020)
2nd ring
Type Taper
Dimension height (B) mm (in) 1.170–1.190 (0.0461–0.0469)
End gap (*1) mm (in) 0.600–0.750 (0.0236–0.0295)
Oil ring
End gap (*1) mm (in) 0.150–0.600 (0.0059–0.0236)
Item Unit
Model
F300CA LF300CA

1-22
0
1
2
3
4
5
6
7
8
9
10
A
Connecting rod
Small end inside diameter mm (in) 22.010–22.024 (0.8665–0.8671)
Big end inside diameter mm (in) 55.990–56.010 (2.2043–2.2051)
Big end side clearance mm (in) 0.140–0.310 (0.0055–0.0122)
Oil clearance (*1) mm (in) 0.025–0.050 (0.0010–0.0020)
Crankshaft
Crankpin diameter mm (in) 52.980–53.000 (2.0858–2.0866)
Runout mm (in) 0.030 (0.0012)
Crankpin width mm (in) 21.000–21.100 (0.8268–0.8307)
Crankcase
Item Unit
Model
F300CA LF300CA
Piston
Diameter mm (in) 95.945–95.960 (3.7774–3.7779)
Measuring point mm (in) 13.500 (0.5315)
Piston clearance mm (in) 0.040–0.067 (0.0016–0.0026)
Ring groove (top) mm (in) 1.230–1.250 (0.0484–0.0492)
Ring groove (2nd) mm (in) 1.220–1.240 (0.0480–0.0488)
Ring groove (oil) mm (in) 2.510–2.530 (0.0988–0.0996)
Pin boss inside diameter mm (in) 22.011–22.018 (0.8666–0.8668)
Pin outside diameter mm (in) 21.996–22.005 (0.8660–0.8663)
Cylinder
Bore mm (in) 96.000–96.012 (3.7795–3.7800)
Piston ring
Top ring
Type Barrel
Dimension height (B) mm (in) 1.200 (0.0472)
End gap (*1) mm (in) 0.200–0.300 (0.0079–0.0118)
2nd ring
Type Taper
End gap (*1) mm (in) 0.600–0.750 (0.0236–0.0295)
Oil ring
End gap (*1) mm (in) 0.150–0.600 (0.0059–0.0236)
Item Unit
Model

1-23
SPEC
Specification
Connecting rod
Small end inside diameter mm (in) 22.010–22.024 (0.8665–0.8671)
Big end inside diameter mm (in) 55.990–56.010 (2.2043–2.2051)
Big end side clearance mm (in) 0.140–0.310 (0.0055–0.0122)
Crankshaft
Crankpin diameter mm (in) 52.980–53.000 (2.0858–2.0866)
Runout mm (in) 0.030 (0.0012)
Crankpin width mm (in) 21.000–21.100 (0.8268–0.8307)
Crankcase
Item Unit
Model
F300CA LF300CA

1-24
Lower unit technical data
0
1
2
3
4
5
6
7
8
9
10
A
Lower unit technical data
Lower unit assembly (regular rotation model)
(*1) Figures obtained using the special service tools.
Lower unit assembly (counter rotation model)
(*1) Figures obtained using the special service tools.
Item Unit
Model
F225CA F250CA F300CA
Lower unit
Holding pressure
kPa (kgf/
cm2, psi)
68.6 (0.686, 9.9)
Forward gear backlash (*1) mm (in) 0.04–0.59 (0.0016–0.0232)
Reverse gear backlash (*1) mm (in) 0.15–0.88 (0.0059–0.0346)
Pinion shim (T3) mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Forward gear shim (T1) mm 2.00, 2.03, 2.06, 2.09, 2.12, 2.15
Reverse gear shim (T2) mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Propeller shaft shim (T4) mm 0.7, 0.8, 0.9, 1.0, 1.1, 1.2
Propeller shaft
Motive torque
N·m (kgf·m,
ft·lb)
0.44–1.32 (0.04–0.13, 0.32–0.97)
Runout mm (in) 0.02 (0.0008)
Drive shaft
Motive torque
N·m (kgf·m,
ft·lb)
0.27–1.94 (0.03–0.20,
0.20–1.43)
Runout mm (in) 1.0 (0.0394)
Item Unit
Model
LF225CA LF250CA LF300CA
Lower unit
Holding pressure
kPa (kgf/
cm2, psi)
68.6 (0.686, 9.9)
Forward gear backlash (*1) mm (in) 0.18–0.76 (0.0071–0.0299)
Reverse gear backlash (*1) mm (in) 0.19–0.84 (0.0075–0.0331)
Pinion shim (T3) mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Forward gear shim (T2) mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Reverse gear shim (T1) mm 2.00, 2.03, 2.06, 2.09, 2.12, 2.15
Propeller shaft shim (T4) mm 0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Propeller shaft
Free play mm (in) 0.25–0.35 (0.0098–0.0138)
Runout mm (in) 0.02 (0.0008)
Drive shaft
Motive torque
N·m (kgf·m,
ft·lb)
0.27–1.94 (0.03–0.20, 0.20–1.43)
Runout mm (in) 1.0 (0.0394)
Power unit technical data / Lower unit technical data

1-25
SPEC
Specification
Bracket unit technical data
PTT system
Item Unit
Model
PTT
Hydraulic pressure
Down
MPa (kgf/
cm2, psi)
6.7–8.7 (67.0–87.0, 971.5–1261.5)
Up
MPa (kgf/
cm2, psi)
13.0–15.0 (130.0–150.0, 1885.0–2175.0)
Motor commutator
Standard undercut (*1) mm (in) 1.4 (0.06)
Motor brush
Item Unit
Model
F300CA LF300CA
PTT
Hydraulic pressure
Down
MPa (kgf/
cm2, psi)
6.7–8.7 (67.0–87.0, 971.5–1261.5)
Up
MPa (kgf/
cm2, psi)
13.0–15.0 (130.0–150.0, 1885.0–2175.0)
Motor commutator
Standard undercut (*1) mm (in) 1.4 (0.06)
Motor brush

1-26
Specified tightening torque
0
1
2
3
4
5
6
7
8
9
10
A
Specified tightening torques are provided for specific nuts, bolts, and screws. When tightening these
fasteners, follow the tightening torque specifications indicated throughout the manual to meet the
design aims of the outboard motor.
Rigging information
Fuel system
Power unit
Part to be tightened Screw size
Tightening torques
N·m kgf·m ft·lb
Water pressure sensor adapter — 23 2.3 17.0
Water pressure sensor — 18 1.8 13.3
Receiver screw M4 4 0.4 3.0
Tightening torques
N·m kgf·m ft·lb
Fuel cup assembly — 5 0.5 3.7
Intake manifold bolt
1st
M8
24 2.4 17.7
2nd 24 2.4 17.7
1st
M6
11 1.1 8.1
2nd 11 1.1 8.1
Intake silencer bolt M6 7 0.7 5.2
Surge tank bracket bolt M6 11 1.1 8.1
Fuel pump cover bolt M6 5 0.5 3.7
Vapor separator drain screw — 2 0.2 1.5
Needle valve assembly screw M4 2 0.2 1.5
Float pin screw M4 2 0.2 1.5
Float chamber cover screw M5 2 0.2 1.5
Vapor separator cover bolt M4 2 0.2 1.5
Pressure regulator screw M5 4 0.4 3.0
Fuel cooler cover screw M5 4 0.4 3.0
Tightening torques
N·m kgf·m ft·lb
Spark plug — 28 2.8 20.7
Power unit mounting bolts
1st
M10
42 4.2 31.0
2nd 42 4.2 31.0
Apron screw M6 3 0.3 2.2
PTT motor lead bolt M6 4 0.4 3.0
Pulser coil bolt M5 4 0.4 3.0
Flywheel magnet bolt
1st
M10
40 4.0 29.5
2nd 90°
Starter motor lead screw M4 2 0.2 1.5
Fuse box screw ø5 2 0.2 1.5
Terminal bolt M8 25 2.5 18.4
PTT relay nut — 5 0.5 3.7
Starter motor nut — 9 0.9 6.6
Bracket unit technical data / Specified tightening torque

1-27
SPEC
Specification
Lower unit (regular rotation model)
Rectifier Regulator cover bolt
1st
M6
6 0.6 4.4
2nd 12 1.2 8.9
Starter motor bracket bolt
M8 25 2.5 18.4
M6 12 1.2 8.9
Starter motor bolt M8 30 3.0 22.1
Engine ECM bolt M6 7 0.7 5.2
Shift actuator bolt M6 19 1.9 14.0
Timing belt tensioner bolt — 39 3.9 28.8
Pulley bolt M10 39 3.9 28.8
Camshaft cap bolts
1st
M7
8 0.8 5.9
2nd 17 1.7 12.5
Driven sprocket bolt M10 60 6.0 44.3
VCT bolt — 60 6.0 44.3
VCT cap — 32 3.2 23.6
Exhaust plug M18 56 5.6 41.3
Braided plug M14 23 2.3 17.0
OCV bolt M6 7 0.7 5.2
Cylinder head bolt
1st
M11
39 3.9 28.8
2nd 180°
1st
M8
14 1.4 10.3
2nd 28 2.8 20.7
Oil pump cover screw M6 4 0.4 3.0
Oil cooler bolt
1st
M6
6 0.6 4.4
2nd 12 1.2 8.9
Bracket bolt M6 12 1.2 8.9
Oil filter union bolt UNF 49 4.9 36.1
Oil pressure sensor — 13 1.3 9.6
Oil filter — 18 1.8 13.3
Thermostat housing bolt M6 12 1.2 8.9
Thermostat cover bolt M6 12 1.2 8.9
Knock sensor — 32 3.2 23.6
Knock sensor bracket bolt M6 12 1.2 8.9
Pulley bracket bolt
1st
M8
14 1.4 10.3
2nd 28 2.8 20.7
Connecting rod bolt
1st
M9
40 4.0 29.5
2nd 90°
Crankcase bolt
1st
M10
55 5.5 40.6
2nd 90°
1st
M8
14 1.4 10.3
2nd 28 2.8 20.7
Tightening torques
N·m kgf·m ft·lb
Water inlet cover bolt M5 2 0.2 1.5
Drain screw — 9 0.9 6.6
Check screw — 9 0.9 6.6
Tightening torques
N·m kgf·m ft·lb

1-28
0
1
2
3
4
5
6
7
8
9
10
A
Lower unit (counter rotation model)
Bracket unit
Trim tab bolt M10 42 4.2 31.0
Propeller nut — 54 5.4 39.8
Lower case mounting bolt (X-transom model) M10 47 4.7 34.7
Lower case stud bolt (U-transom model) — 23 2.3 17.0
Lower case mounting nut (U-transom model) — 47 4.7 34.7
Lower case mounting bolt (U-transom model) M10 47 4.7 34.7
Water inlet cover screw M5 1 0.1 0.7
Propeller shaft housing ring nut — 155 15.5 114.3
Cover bolt M8 8 0.8 5.9
Drive shaft nut — 40 4.0 29.5
Drive shaft ring nut — 177 17.7 130.5
Pinion nut — 143 14.3 105.5
Tightening torques
N·m kgf·m ft·lb
Water inlet cover bolt M5 2 0.2 1.5
Drain screw — 9 0.9 6.6
Check screw — 9 0.9 6.6
Trim tab bolt M10 42 4.2 31.0
Propeller nut — 54 5.4 39.8
Lower case mounting bolt (X-transom model) M10 47 4.7 34.7
Lower case stud bolt (U-transom model) — 23 2.3 17.0
Lower case mounting nut (U-transom model) — 47 4.7 34.7
Lower case mounting bolt (U-transom model) M10 47 4.7 34.7
Water inlet cover screw M5 1 0.1 0.7
Propeller shaft housing ring nut — 155 15.5 114.3
Cover bolt M8 8 0.8 5.9
Drive shaft nut — 40 4.0 29.5
Drive shaft ring nut — 177 17.7 130.5
Pinion nut — 143 14.3 105.5
Tightening torques
N·m kgf·m ft·lb
Speed sensor — 18 1.8 13.3
Adapter screw ø6 4 0.4 3.0
Upper mounting nut — 72 7.2 53.1
Lower mounting nut — 72 7.2 53.1
Upper mount bracket bolt M10 55 5.5 40.6
Lower mount bracket bolt M10 55 5.5 40.6
Upper case bolt
M10 42 4.2 31.0
M8 20 2.0 14.8
Anode screw M6 4 0.4 3.0
Drain bolt — 27 2.7 19.9
Oil strainer bolt M6 12 1.2 8.9
Exhaust manifold bolt M8 20 2.0 14.8
Tightening torques
N·m kgf·m ft·lb

1-29
SPEC
Specification
PTT unit
Oil pan bolt M8 20 2.0 14.8
Muffler bolt M8 20 2.0 14.8
Plate screw M6 4 0.4 3.0
Self-locking nut — 23 2.3 17.0
Grease nipple — 3 0.3 2.2
Trim sensor screw M6 4 0.4 3.0
Tightening torques
N·m kgf·m ft·lb
Reservoir mounting bolt M8 19 1.9 14.0
Reservoir cap — 7 0.7 5.2
PTT motor mounting bolt M8 19 1.9 14.0
Pump bracket bolt M5 7 0.7 5.2
Gear pump bolt M5 7 0.7 5.2
Manual valve — 2 0.2 1.5
Tilt ram — 65 6.5 47.9
Tilt piston screw M6 7 0.7 5.2
Pipe joint — 15 1.5 11.1
Pipe joint adapter — 20 2.0 14.8
Trim cylinder end screw — 160 16.0 118.0
Tilt cylinder end screw — 90 9.0 66.4
Tightening torques
N·m kgf·m ft·lb

1-30
General tightening torque
0
1
2
3
4
5
6
7
8
9
10
A
General tightening torque
This chart indicates the tightening torques for
standard fasteners with a standard ISO
thread pitch.
Width
across
flats (A)
Screw
size (B)
General torque
specifications
N·m kgf·m ft·lb
8 mm
10 mm
12 mm
14 mm
17 mm
M5
M6
M8
M10
M12
5
8
18
36
43
0.5
0.8
1.8
3.6
4.3
3.7
5.9
13.3
26.6
31.7
Specified tightening torque / General tightening torque

1-31
SPEC
Specification
— MEMO —

TECH
FEA
0
1
2
3
4
5
6
7
8
9
10
A
Technical features and description 2
Electronic control system ................................................ 2-1
Engine ECM component ........................................................... 2-2
Sensor, switch, and actuator ..................................................... 2-3
Electronic fuel injection control .................................................. 2-5
Ignition timing control ................................................................ 2-8
VCT control ............................................................................. 2-10
Knock control ........................................................................... 2-11
Engine speed control ............................................................... 2-12
ETV control .............................................................................. 2-14
Electronic shift control system ................................................. 2-15
Fail-safe control ....................................................................... 2-16
Charging system ..................................................................... 2-18
Digital network control ............................................................. 2-19
Sensor, switch ......................................................................... 2-22
Y-COP ............................................................................... 2-23
Power unit system .......................................................... 2-24
Shimless valve lifter ................................................................. 2-25
Sleeveless cylinder .................................................................. 2-25
Oil cooler ................................................................................. 2-26
Fuel system ..................................................................... 2-27
Fuel diagram ........................................................................... 2-27
Lubrication system ......................................................... 2-29
Lubrication diagram ................................................................. 2-29
Cooling system ............................................................... 2-30
Cooling diagram ...................................................................... 2-30
Intake and exhaust system ............................................ 2-32
Intake and exhaust diagram .................................................... 2-32
Lower unit ........................................................................ 2-33
Double taper roller bearing ...................................................... 2-33
Propeller shaft bearing (regular rotation model) ...................... 2-33
Propeller .................................................................................. 2-34

2-1
TECH
FEA Technical features and description
Electronic control system
This model uses an electronic fuel injection control, ignition timing control, knock control, engine
speed control, Digital Electronic Control, electronic shift control, ETV control, and fail-safe control.
The engine ECM performs these controls based on data received from each sensor and switch.
The engine ECM is equipped with a self-diagnosis function. This function can be used to check trou-
ble codes on the YDIS.
It is also equipped with Y-COP as an anti-theft measure (optional).
LPS
YDISY-COP
TPS
ETV
OCV
OCV
SPS
Check valve
Air
Pressure regulator Filter
Check valve
High-pressure
fuel pump
Vapor separator
Fuel injector
Ignition
coil
Canister
Water separator
Fuel
Water
detection
switch
Vapor shut-off
valve
Air
Shift actuator
Ignition
coil
Fuel injector
Shift control
Valve control
Fuel control
Ignition control
Command
Link Plus
Multifunction
Color Gauge
Battery
Hub
Engine
shut-off
switch
Engine
ECM
Engine
start switch
Cam position sensor
Pulser coil
Air pressure sensor
Oil pressure sensor
Knock sensor
Thermoswitch
Water pressure sensor (optional)
Speed sensor (optional)
Digital
Electronic
Control
ECM
(optional)

2-2
0
1
2
3
4
5
6
7
8
9
10
A
Engine ECM component
a ETV
b Air pressure sensor
c Air temperature sensor
d Pulser coil
e Engine temperature sensor
f Vapor shut-off valve
g Thermoswitch (PORT)
h OCV (PORT)
i Cam position sensor (PORT IN)
j Fuel injector (PORT)
k High-pressure fuel pump
l Low-pressure fuel pump
m TPS
n SPS
o Shift actuator
p OCV (STBD)
q Thermoswitch (STBD)
r Cam position sensor (STBD IN)
s Oil pressure sensor
t Fuel injector (STBD)
u Ignition coil (STBD)
v Knock sensor
w Engine ECM
x Ignition coil (PORT)
y Cam position sensor (PORT EX)
a
b
c
d e f g
h
i
j
k
y
x
w
v s
p
q
r
lmo n
u t

2-3
TECH
Sensor, switch, and actuator
Engine ECM Determines the engine operating conditions according to the input signals
from the sensors which are installed at various locations on the engine,
and sends output signals to operate the actuators to perform the various
control functions.
Pulser coil Detects the engine speed.
Detects the crankshaft angle and piston positions.
Determines each group of cylinders (#1 and #4, #2 and #5, and #3 and
#6).
Cam position sen-
sor (PORT EX)
Determines the stroke. (For example, distinguishes the compression stroke
TDC from the exhaust stroke TDC.)
Determines each group of cylinders (#1 and #4, #2 and #5, and #3 and
#6).
Determines the stroke of each cylinder according to the signals from both
the pulser coil and the cam position sensor (PORT EX).
Cam position sen-
sor (PORT IN)
Detects the advance angle on the port camshaft.
Cam position sen-
sor (STBD IN)
Detects the advance angle on the starboard camshaft.
TPS 1 Detect the throttle valve opening. TPS 1 is the main sensor and TPS 2 is
the sub sensor. TPS 1 and TPS 2 mutually monitor each other for malfunc-
tions.
TPS 2
SPS 1 Detect the shift position. SPS 1 is the main sensor and SPS 2 is the sub
sensor. SPS 1 and SPS 2 mutually monitor each other for malfunctions.SPS 2
ETV Opens and closes the throttle valve using a motor.
Shift actuator Drives the motor according to the engine ECM command for engaging or
disengaging the gearshift.
Air pressure sensor Detects the intake air pressure.
Air temperature
sensor
Detects the intake air temperature.
Engine tempera-
ture sensor
Detects the engine temperature.
Oil pressure sensor Detects the oil pressure.
Thermoswitch Detects engine overheating.
Knock sensor Detects engine knocking.
Engine shut-off
switch
Stops the engine forcibly.
Fuel injector Injects fuel.
Ignition coil Activates the ignition.
Vapor shut-off
valve
Controls the amount of vapor gas to be sent from the vapor separator to
the intake system.
OCV Advances or retards the camshaft timing by switching the oil passages
through which the engine oil is sent into the advance chamber or the retard
chamber in the rotor vane housing.
High-pressure fuel
pump
Pressurizes the fuel and sends the fuel to the fuel rails.

2-4
0
1
2
3
4
5
6
7
8
9
10
A
Low-pressure fuel
pump
Sends the fuel from the fuel tank to the vapor separator.

2-5
TECH
Electronic fuel injection control
In electronic fuel injection control, the engine ECM determines the fuel injection timing and fuel
injection amount according to the signals from the sensors and performs the appropriate fuel injec-
tion. The fuel injection amount is controlled by the fuel injector actuation time. There are 2 types of
fuel injection timing control: synchronous fuel injection and asynchronous fuel injection. According
to the engine operating conditions during the control, the control mode switches automatically
between the start-up mode, normal operating mode, and fuel injection cutoff mode. In addition, vari-
ous compensations are made to determine the actual fuel injection timing and fuel injection amount.
Also, a fuel injector anti-sticking control has been adopted.
TPS
SPS
LPS
Pulser coil
Cam position sensor
(PORT EX)
Cam position sensor
(PORT IN)
Cam position sensor
(STBD IN)
Air pressure sensor
Thermoswitch
Engine shut-off switch
Battery
Engine
ECM
Fuel injector
Low-pressurefuel
pump
Vapor shut-off
valve
High-pressure
fuel pump

2-6
0
1
2
3
4
5
6
7
8
9
10
A
Synchronous fuel injection
Synchronous fuel injection is fuel injection that occurs using a fixed timing, which is synchronized
with the crankshaft angle set by the engine ECM according to the signals from the pulser coil.
Example: Group fuel injection in the start-up mode
Fuel injection
type
Fuel injection timing Fuel injection amount Condition
Simultaneous
fuel injection
in the start-up
mode
All cylinders according to
the fuel injection setting
data
According to the fuel
injection setting data when
the engine temperature is
78–80 °C (172–176 °F) or
more and the fuel injection
setting data when the
engine temperature is less
than 78–80 °C (172–176
°F)
Until cylinder
identification is
completed by the
pulser coil
Group fuel
injection in the
start-up mode
Each cylinder group (#1
and #4, #2 and #5, and #3
and #6) at BTDC 430°
(BTDC 70° according to the
exhaust TDC)
Until engine
starting is detected
(500 r/min or more)
Group fuel
injection in the
normal
operating
mode
Each cylinder group (#1
and #4, #2 and #5, and #3
and #6) according to the
exhaust and compression
TDCs
According to the fuel
injection setting data for the
fuel octane rating and the
knock learning value, which
are recorded in the engine
ECM
Until cylinder
identification is
completed by the
cam position
sensor (PORT EX)
2 times for every 2 turns of
the crankshaft
Sequential
fuel injection
in the normal
operating
mode
Each cylinder according to
the injection completion
timing, which is set using
the exhaust TDC
After cylinder
identification is
completed by the
cam position
sensor (PORT EX)
Compression Combustion Exhaust Intake Compression
ExhaustIntake Compression Combustion Intake
ExhaustCompression Combustion IntakeIntakeExhaust
Compression CombustionIntakeExhaust Exhaust
Compression CombustionIntakeExhaustCombustion
CompressionIntakeExhaustCombustionCompression
#1
Cam position
sensor (EX)
signal
Injection #1
Injection #2
Injection #3
Injection #4
Injection #5
Injection #6
#2
#3
#4
#5
#6
Pulser coil
signal

2-7
TECH
Asynchronous fuel injection
Asynchronous fuel injection is fuel injection that occurs using the timing determined necessary by
the engine ECM according to the signals from the sensors, not synchronized with the crankshaft
angle set by the engine ECM. At engine start-up or during acceleration, if the changes in the signals
from the TPS or air pressure sensor exceed a predetermined level, fuel injection is performed simul-
taneously for all of the cylinders.
In the fuel injection cutoff mode, the fuel injection is cut off while the engine speed control is being
performed. See “Engine speed control” (2-12).
Fuel injection amount compensation
The fuel injection control makes compensations to the fuel injection amount according to the engine
operating conditions. The compensations are determined according to the signals from the following
sensors.
Fuel injector anti-sticking control
After the engine start switch is turned to ON and before the high-pressure fuel pump starts operat-
ing, the engine ECM sends a signal once to actuate all of the fuel injectors simultaneously to pre-
vent the fuel injector valves from sticking.
Compensation Corresponding sensor
For changes in intake air pressure Air pressure sensor
For changes in intake air temperature Air temperature sensor
During warm-up Engine temperature sensor
After start-up Engine temperature sensor
For atmospheric pressure Air pressure sensor
During dashpot function operation Air pressure sensor, LPS, SPS, and pulser coil
For changes in air and fuel ratio Air pressure sensor, engine temperature
sensor, and pulser coil
During acceleration Air pressure sensor and TPS
For retarded ignition timing Engine temperature sensor and pulser coil

2-8
0
1
2
3
4
5
6
7
8
9
10
A
Ignition timing control
In ignition timing control, the engine ECM uses signals from the sensors to assess engine operating
conditions and determines the basic ignition timing and ignition coil energization time. The engine
ECM also applies various restrictions and compensations to determine the actual ignition timing.
The ignition timing is also controlled according to the knock control. See “Knock control” (2-11).
TPS
LPS
SPS
Pulser coil
Cam position sensor
(PORT EX)
Cam position sensor
(PORT IN)
Cam position sensor
(STBD IN)
Air pressure sensor
Knock sensor
Battery
Engine
ECM Ignition coil

2-9
TECH
Basic ignition timing
The basic ignition timing is divided into 3 types: engine starting ignition timing, idling basic ignition
timing, and normal basic ignition timing.
Ignition timing restriction
The advancing or retarding of the ignition timing is restricted according to the engine speed, engine
temperature, and dashpot function.
Ignition timing compensation
The ignition timing control makes advance or retard compensations to the ignition timing according
to the engine operating conditions. The compensations are determined according to the signals
from the following sensors.
Basic ignition timing Criteria Ignition cylinder
Engine starting ignition timing
(BTDC 10°)
Engine is starting (less than
500 r/min)
All cylinders simultaneously
Idling basic ignition timing Engine speed is at engine idle
speed
Each cylinder sequentially
Normal basic ignition timing Engine speed is more than
engine idle speed
Each cylinder sequentially
Restriction Corresponding sensor Details
Engine speed restriction Pulser coil The ignition timing is restricted
between BTDC 50° (advance
angle) and ATDC 20° (retard
angle) according to the engine
speed.
Engine temperature restriction Engine temperature sensor The ignition timing is restricted
between BTDC 50° (advance
angle) and ATDC 30° (retard
angle) according to the engine
temperature.
Dashpot function restriction
(when the throttle valve is
closed quickly)
Pulser coil and LPS The ignition timing is restricted
to ATDC 20° when the
dashpot function operates.
Compensation Corresponding sensor
After start-up Engine temperature sensor
For stable idle speed LPS and pulser coil
During dashpot function operation LPS, SPS, and pulser coil
For shift-cutout control Pulser coil and SPS
During acceleration Air pressure sensor and TPS

2-10
0
1
2
3
4
5
6
7
8
9
10
A
VCT control
In VCT control, the engine ECM determines the appropriate intake valve opening timing according
to the signals from the sensors. According to the engine operating conditions, the OCVs are oper-
ated and the VCT assemblies are advanced, retarded, or maintained in the current position to con-
trol the intake valve opening timing.
TPS
LPS
Pulser coil
Cam position sensor
(PORT EX)
Cam position sensor
(PORT IN)
Cam position sensor
(STBD IN)
Air pressure sensor
Engine
ECM
OCV (PORT)
OCV (STBD)

2-11
TECH
Knock control
In knock control, the engine ECM receives the knock signal from the knock sensor which is installed
on the cylinder block between the cylinder banks. The engine ECM retards the ignition timing and
decreases the engine speed according to the amount of knocking to protect the engine from dam-
age.
If the knocking occurs frequently, the ignition timing is retarded until the knocking is no longer
detected, and the retarded ignition timing is maintained, using the learning function.
The knock control activates according to the following conditions:
The knock control also activates when the engine temperature sensor is malfunctioning regardless
of the preceding conditions.
Engine
temperature Less than 20 °C
(68 °F)
20–25 °C (68–77 °F)
More than 25 °C
(77 °F)
Engine speed
Less than 4500 r/min Knock control does
not activate
Knock control
activates if conditions
continue for 0.5
seconds
Knock control
activates
4500 r/min or more Knock control
activates

2-12
0
1
2
3
4
5
6
7
8
9
10
A
Engine speed control
In engine speed control, the engine ECM decreases the engine speed to protect the engine from
damage.
Overheat control
Low oil pressure control
Criteria Description
The thermoswitch is on. The engine ECM controls the throttle valve opening. As a
result, the engine speed cannot increase to more than 2000–
3000 r/min. Also, the alert buzzer sounds and the overheat
alert indicator comes on.
The pressure decreases to less
than 250 kPa (2.5 kgf/cm2,
36.25 psi).
The engine ECM controls the throttle valve opening. As a
result, the engine speed cannot increase to more than 2000–
3000 r/min. Also, the alert buzzer sounds and the oil pressure
alert indicator comes on.
TPS
LPS
SPS
Pulser coil
Cam position sensor
(PORT EX)
Cam position sensor
(PORT IN)
Cam position sensor
(STBD IN)
Air pressure sensor
Oil pressure sensor
Thermoswitch
Engine
ECM
Fuel injector
Digital Electronic
Control ECM
Command Link Plus
Multifunction Color
Gauge
Ignition coil
ETV motor

2-13
TECH
Skip-firing control
ETV is locked in
an open position.
Controls the
engine speed
when it has been
determined that
the ETV is locked
in an open
position.
Over 1501 r/min Firing and fuel injection will be
skipped for all of the cylinders.
1399–1500 r/min Firing and fuel injection will be
skipped for cylinders #1, #2, #3, #5,
and #6.
skipped for cylinders #2, #3, #5, and
#6.
skipped for cylinders #2, #3, and #5.
skipped for cylinders #2 and #5.
skipped for cylinder #2.
Engine is over
revving.
Controls the
engine speed
when over
revving is
detected.
Over 6450 r/min Firing and fuel injection will be
skipped for all of the cylinders.
skipped for cylinders #1, #2, #3, #5,
and #6.
skipped for cylinders #2, #3, #5, and
#6.
skipped for cylinders #2, #3, and #5.
skipped for cylinders #2 and #5.
skipped for cylinder #2.
Engine is rotating
in reverse.
Stops the engine
if the engine
reverse rotation
is detected.
Engine reverse rotation is determined using 2
parameters: presence or absence of the cam position
sensor (PORT EX) signal, and the actual advance angle
of the intake camshaft.
If the reverse rotation is detected, the engine ECM cuts
off the fuel injection and ignition to stop the engine.
Engine speed is
high when
shifting gears.
Detects the
activation of shift
cutout control,
and controls the
engine speed.
Decreases the engine speed to less than 1500 r/min.
Engine shut-off
switch is on.
Cancels the fuel injection control and ignition control at all of the cylinders.

2-14
0
1
2
3
4
5
6
7
8
9
10
A
ETV control
In ETV control, the engine ECM determines the appropriate throttle valve opening according to the
signals from the sensors, and controls the throttle valve. The engine ECM is equipped with a learn-
ing function that records all of the compensations made by the control to the throttle valve opening
for the operating conditions up to that point. In addition, the engine idle speed is controlled using the
ETV control.
TPS
LPS
SPS
Pulser coil
Air pressure sensor
Thermoswitch
Engine
ECM ETV motor

2-15
TECH
Electronic shift control system
The electronic shift control system operates the shift actuator based on the Digital Electronic Control
communication data transmitted by the Digital Electronic Control ECM.
TPS
SPS
Pulser coil
Cam position sensor
(PORT EX)
Cam position sensor
(PORT IN)
Cam position sensor
(STBD IN)
Digital Electronic
Control ECM
Engine
ECM
Fuel injector
Ignition coil
ETV motor
Shift actuator

2-16
0
1
2
3
4
5
6
7
8
9
10
A
Fail-safe control
In fail-safe control, the engine ECM enters the fail-safe mode when an electrical component mal-
functions. The fail-safe control system records the trouble codes according to the engine trouble
conditions.
Trouble
code
Item
LAN
gauge
display
Trouble conditions to be detected
13 Pulser coil C/E No signal
15 Engine
temperature
sensor
C/E
Open or short circuit in the engine temperature sensor
circuit. Output voltage is less than 0.18 V or more than
4.90 V.
17 Knock sensor C/E Output voltage is less than 0.90 V or more than 4.00 V.
23 Air temperature
sensor
C/E
Output voltage is less than 0.10 V or more than 4.60 V.
24 Cam position
sensor (PORT
EX)
C/E
Signal error (irregular)
29 Air pressure
sensor
C/E
Output voltage is less than 0.20 V or more than 4.50 V.
39 Oil pressure
sensor L (*1)
Output voltage is less than 0.30 V, more than 4.80 V for
260 seconds, or more than 4.80 V when the engine is
stopped.
71 Cam position
sensor (PORT
EX)
C/E
72 Cam position
sensor (PORT
IN)
C/E
73 OCV (STBD) C/E Open or short circuit in the OCV circuit
74 OCV (PORT) C/E Open or short circuit in the OCV circuit
86 Y-COP
C/E
Open or short circuit in the Y-COP circuit
Communication error continues for more than 3
seconds.
112, 113,
114, 115,
116, 117,
118, 119,
121, 122,
123, 129,
136, 137,
138, 139,
141, 142,
144, 145
ETV
C/E
Open or short circuit in the ETV relay and ETV motor
circuit
124, 125,
126, 127,
128
TPS
C/E
Output voltage is less than 0.35 V or more than 4.80 V,
or the output voltage difference between TPS 1 and
TPS 2 is 2.30 V or more.

2-17
TECH
(*1) Low oil pressure alert is displayed.
146, 147,
148, 149,
150, 153,
154, 155
SPS
C/E
Open or short circuit in the SPS circuit, and shift
actuator does not operate.
156, 157 Extension
wiring harness
C/E
Communication error between the engine ECM and
Digital Electronic Control
160, 161,
162, 163,
164, 165,
166, 167,
168, 169,
170, 171,
172, 173,
174, 175,
176, 177,
178, 179,
180, 181
LPS
C/E
Open or short circuit in the LPS circuit
Trouble
code
Item
LAN
gauge
display
Trouble conditions to be detected

2-18
0
1
2
3
4
5
6
7
8
9
10
A
Charging system
This model features a high output charging system that provides up to 70 A.
This charging system also functions as a battery isolator that will charge a house (accessory) bat-
tery.
The engine ECM senses the voltage of the main battery and house (accessory) battery based on
the signals from the Rectifier Regulator.
If the main battery voltage decreases below 13.5 V when the house (accessory) battery is con-
nected, the regulator function of the Rectifier Regulator will be turned off by the engine ECM to
increase the efficiency of charging the main battery.
Lighting coil
(stator assembly)
Engine ECM
Fuse box
Rectifier
Regulator
Isolator lead
(optional)
Main
battery
House
battery
(optional)

2-19
TECH
Digital network control
This model features the newly developed Command Link Plus Digital Electronic Control that
includes the Digital Electronic Control ECM.
Mutual authentication is performed between the Digital Electronic Control ECM and the engine
ECM. The Digital Electronic Control system operates only when the mutual authentication has suc-
ceeded.
The Digital Electronic Control ECM converts actions on the control lever related to the gear shift and
the throttle opening or closing into the electrical signals and transmits the signals to the engine
ECM. The engine ECM controls the operation of ETV and shift actuator based on the electrical sig-
nals.
The electric controlled shift-in or shift-out provides smooth, reliable, and quiet gear shift engage-
ment.
The Command Link Plus Multifunction Color Gauge and the new engine start switch can be
installed (optional).

2-20
0
1
2
3
4
5
6
7
8
9
10
A
SET
MENU
CANCEL
SET
MENU
CANCEL
Y-COP
LPS LPS LPSLPS LPS LPS
Command Link Plus
Multifunction Color
Gauge
Command Link Plus
Multifunction Color
Gauge
Hub Hub
Engine start/
stop button
Engine shut-off
switch
Station
selector
switch
Control
lever
Control
lever
Digital
Electronic
Control ECM
(PORT)
Digital
Electronic
Control ECM
(STBD)
Digital
Electronic
Control ECM
(center)
Digital
Electronic
Control ECM
(PORT)
Digital
Electronic
Control ECM
(STBD)
Digital
Electronic
Control ECM
(center)
Control
lever
Control
lever
Station
selector
switch
Engine
start/stop
button
Main switch
Engine
ECM
Engine
ECM
Engine
ECM
(optional)

2-21
TECH
Digital Electronic Control component
A Single type (6X6)
B Twin type (6X6)
C Triple type (6X6)
D Single type (6X7)
a Control lever
b PTT switch
c LPS
d Free throttle switch
e Digital Electronic Control ECM
f Active indicator
g Alert indicator
h Engine selector switch
i Engine start switch
j Main switch
k Command Link Plus Multifunction Color
Gauge
l Engine start/stop button (single type)
m Engine start/stop button (twin type)
n Engine start/stop button (triple type)
o Engine start/stop button (all type)
p Station selector switch
a
c
d
e
f
g
a ab
c
d
f
g
B
e
h
b
d
f
g
C
e
D
b
c
d
e
f
g
a
bA
i
j
k
l m pon
c

2-22
0
1
2
3
4
5
6
7
8
9
10
A
Sensor, switch
Digital Electronic Control
ECM
Converts actions on the control lever related to the gearshift and the
throttle opening or closing into electrical signals and transmits the
signals to the engine ECM.
Receives digital signals transmitted from the engine ECM. Performs
mutual authentication with the engine ECM to perform various
controls.
LPS Detects the control lever position. LPS 1 is the main sensor and
LPS 2 is the sub sensor. LPS 1 and LPS 2 mutually monitor each
other for malfunctions.
Free throttle switch Enables engine speed to be increased while in neutral using the
control lever.
Active indicator Displays operational conditions of the Digital Electronic Control.
Active indicator Comes on when communication error occurs between the 6Y9
Digital Electronic Control and the engine ECM.
Engine selector switch Selects the outboard motor to be operated.
Engine start/stop button Starts and stops the engine while the system is activated.
Engine start switch Activates and deactivates the system.
Starts and stops the engine.
Main switch Activates (with the engine start switch ON) and deactivates the
system.
PTT switch Operates the PTT unit to adjust the trim/tilt angle of the outboard
motor.
Station selector switch Switches between the main station and substation.
Command Link Plus
Multifunction Color Gauge
Displays engine status and boat status on a single display.

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2011 YAMAHA F225CA 4-STROKE OUTBOARD Service Repair Manual SN：1000001 and up

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2011 YAMAHA F225CA 4-STROKE OUTBOARD Service Repair Manual SN：1000001 and up