Yamaha FZS6W User manual

FZS6W
4S8-28197-10
SERVICE MANUAL
LIT-11616-20-60
FZS6WC

EAS20050
FZS6W/FZS6WC
SERVICE MANUAL
©2006 by Yamaha Motor
Corporation, U.S.A.
First edition, Octover 2006
All rights reserved. Any reproduction
or unauthorized use without the written
permission of Yamaha Motor Corporation,
U.S.A. is expressly prohibited.
Printed inU.S.A.
P/N LIT-11616-20-60

EAS20070
NOTICE
This manual was produced by the Yamaha Motor Company, Ltd. primarily for use by Yamaha deal-
ers and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one
manual. Therefore, anyone who uses this book to perform maintenance and repairs on Yamaha
vehicles should have a basic understanding of mechanics and the techniques to repair these types
of vehicles. Repair and maintenance work attempted by anyone without this knowledge is likely to
render the vehicle unsafe and unfit for use.
This model has been designed and manufactured to perform within certain specifications in regard
to performance and emissions. Proper service with the correct tools is necessary to ensure that the
vehicle will operate as designed. If there is any question about a service procedure, it is imperative
that you contact a Yamaha dealer for any service information changes that apply to this model. This
policy is intended to provide the customer with the most satisfaction from his vehicle and to conform
to federal environmental quality objectives.
Yamaha Motor Company, Ltd. is continually striving to improve all of its models. Modifications and
significant changes in specifications or procedures will be forwarded to all authorized Yamaha deal-
ers and will appear in future editions of this manual where applicable.
NOTE:
• This Service Manual contains information regarding periodic maintenance to the emission control
system. Please read this material carefully.
• Designs and specifications are subject to change without notice.
EAS20080
IMPORTANT MANUAL INFORMATION
Particularly important information is distinguished in this manual by the following.
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED!
Failure to follow WARNING instructions could result in severe injury or death to
the vehicle operator, a bystander or a person checking or repairing the vehicle.
A CAUTION indicates special precautions that must be taken to avoid damage
to the vehicle.
A NOTE provides key information to make procedures easier or clearer.
WARNING
CAUTION:
NOTE:

EAS20090
HOW TO USE THIS MANUAL
This manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensive
explanations of all installation, removal, disassembly, assembly, repair and check procedures are
laid out with the individual steps in sequential order.
• The manual is divided into chapters and each chapter is divided into sections. The current section
title is shown at the top of each page “1”.
• Sub-section titles appear in smaller print than the section title “2”.
• To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each
removal and disassembly section “3”.
• Numbers are given in the order of the jobs in the exploded diagram. A number indicates a disas-
sembly step “4”.
• Symbols indicate parts to be lubricated or replaced “5”.
Refer to “SYMBOLS”.
• A job instruction chart accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc “6”.
• Jobs requiring more information (such as special tools and technical data) are described sequen-
tially “7”.

EAS20100
SYMBOLS
The following symbols are used in this manual
for easier understanding.
NOTE:
The following symbols are not relevant to every
vehicle.
1. Serviceable with engine mounted
2. Filling fluid
3. Lubricant
4. Special tool
5. Tightening torque
6. Wear limit, clearance
7. Engine speed
8. Electrical data
9. Engine oil
10.Gear oil
11.Molybdenum-disulfide oil
12.Wheel-bearing grease
13.Lithium-soap-based grease
14.Molybdenum-disulfide grease
15.Apply locking agent (LOCTITE®)
GM
E
BLS M
91011
12 13 14
15 16
LT New
T
R
.
.
123
456
78
16.Replace the part

1
2
3
4
5
6
7
8
9
EAS20110 TABLE OF CONTENTS
GENERAL INFORMATION
SPECIFICATIONS
PERIODIC CHECKS AND ADJUSTMENTS
CHASSIS
ENGINE
COOLING SYSTEM
FUEL SYSTEM
ELECTRICAL SYSTEM
TROUBLESHOOTING

1
GENERAL INFORMATION
IDENTIFICATION ..........................................................................................1-1
VEHICLE IDENTIFICATION NUMBER...................................................1-1
MODEL LABEL.......................................................................................1-1
FEATURES ...................................................................................................1-2
OUTLINE OF FI SYSTEM ......................................................................1-2
FI SYSTEM.............................................................................................1-3
INSTRUMENT FUNCTIONS ..................................................................1-4
IMPORTANT INFORMATION .......................................................................1-7
PREPARATION FOR REMOVAL AND DISASSEMBLY..........................1-7
REPLACEMENT PARTS.........................................................................1-7
GASKETS, OIL SEALS AND O-RINGS..................................................1-7
LOCK WASHERS/PLATES AND COTTER PINS ...................................1-7
BEARINGS AND OIL SEALS .................................................................1-8
CIRCLIPS ...............................................................................................1-8
CHECKING THE CONNECTIONS ...............................................................1-9
SPECIAL TOOLS........................................................................................1-10

IDENTIFICATION
1-1
EAS20130
IDENTIFICATION
EAS20140
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number “1” is
stamped into the right side of the steering
head pipe.
EAS20150
MODEL LABEL
The model label “1” is affixed to the frame. This
information will be needed to order spare
parts.

FEATURES
1-2
EAS20170
FEATURES
EAS4S81003
OUTLINE OF FI SYSTEM
The main function of a fuel supply system is to provide fuel to the combustion chamber at the opti-
mum air-fuel ratio in accordance with the engine operating conditions and the atmospheric tempera-
ture.
In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the combus-
tion chamber is created by the volume of the intake air and the fuel that is metered by the jet used in
the respective carburetor.
Despite the same volume of intake air, the fuel volume requirement varies by the engine operating
conditions, such as acceleration, deceleration, or operating under a heavy load. Carburetors that
meter the fuel through the use of jets have been provided with various auxiliary devices, so that an
optimum air-fuel ratio can be achieved to accommodate the constant changes in the operating con-
ditions of the engine.
As the requirements for the engine to deliver more performance and cleaner exhaust gases
increase, it becomes necessary to control the air-fuel ratio in a more precise and finely tuned man-
ner. To accommodate this need, this model has adopted an electronically controlled fuel injection
(FI) system, in place of the conventional carburetor system. This system can achieve an optimum
air-fuel ratio required by the engine at all times by using a microprocessor that regulates the fuel
injection volume according to the engine operating conditions detected by various sensors.
The adoption of the FI system has resulted in a highly precise fuel supply, improved engine
response, better fuel economy, and reduced exhaust emissions. Furthermore, the air induction sys-
tem (AI system) has been placed under computer control together with the FI system in order to
realize cleaner exhaust gases.
1. Ignition coil
2. Air filter case
3. Intake air temperature sensor
4. Fuel delivery hose
5. Fuel tank
6. Fuel pump
7. Intake air pressure sensor
8. Throttle position sensor
9. Fuel injector
10.Catalytic converter
11.Crankshaft position sensor
12.Coolant temperature sensor
13.Spark plug
14.Pressure regulator
15.Battery
16.ECU
17.Fuel injection system relay
18.Engine trouble warning light
19.Lean angle sensor
20.O2sensor

FEATURES
1-3
EAS4S81004
FI SYSTEM
The fuel pump delivers fuel to the injector via the fuel filter. The pressure regulator maintains the fuel
pressure that is applied to the injector at only 250 kPa (2.5 kg/cm2). Accordingly, when the energiz-
ing signal from the ECU energizes the injector, the fuel passage opens, causing the fuel to be
injected into the intake manifold only during the time the passage remains open. Therefore, the
longer the length of time the injector is energized (injection duration), the greater the volume of fuel
that is supplied. Conversely, the shorter the length of time the injector is energized (injection dura-
tion), the lesser the volume of fuel that is supplied.
The injection duration and the injection timing are controlled by the ECU. Signals that are input from
the throttle position sensor, crankshaft position sensor, intake air pressure sensor, intake tempera-
ture sensor, coolant temperature sensor and O2sensor enable the ECU to determine the injection
duration. The injection timing is determined through the signals from the crankshaft position sensor.
As a result, the volume of fuel that is required by the engine can be supplied at all times in accor-
dance with the driving conditions.
1. Fuel pump
2. Pressure regulator
3. Fuel injector
4. Throttle body
5. Intake air temperature sensor
6. Throttle position sensor
7. Intake air pressure sensor
8. ECU
9. Coolant temperature sensor
10.Crankshaft position sensor
11.O2sensor
A. Fuel system
B. Control system

FEATURES
1-4
EAS4S81005
INSTRUMENT FUNCTIONS
WARNING
EWA4S81002
Be sure to stop the vehicle before making
any setting changes to the multi-function
meter unit.
The multi-function meter unit is equipped with
the following:
• a speedometer (which shows the riding
speed)
• a tachometer (which shows engine speed)
• an odometer (which shows the total distance
traveled)
• two tripmeters (which show the distance trav-
eled since they were last set to zero)
• a fuel reserve tripmeter (which shows the
distance traveled since the left segment of
the fuel meter started flashing)
•aclock
• a fuel meter
• a coolant temperature display
• an air intake temperature displaya self-diag-
nosis device
• an LCD and tachometer brightness control
mode
NOTE:
• Be sure to turn the key to “ON” before using
the “SELECT” and “RESET” buttons.
• To switch the speedometer and odometer/
tripmeter displays between kilometers and
miles, press the “SELECT” button for at least
one second.
Tachometer
The electric tachometer allows the rider to
monitor the engine speed and keep it within
the ideal power range.
When the key is turned to “ON”, the tachome-
ter needle will sweep once across the r/min
range and then return to zero r/min in order to
test the electrical circuit.
CAUTION:
ECA4S81004
Do not operate the engine in the tachome-
ter red zone.
Red zone: 14000 r/min and above
Clock mode
The clock is displayed when the key is turned
to “ON”. In addition, the clock can be displayed
for 10 seconds by pushing the “SELECT” but-
ton when the main switch is in the “OFF” or
“LOCK” position.
To set the clock
1 Turn the key to “ON”.
2. Push the “SELECT” button and “RESET”
button together for at least two seconds.
3. When the hour digits start flashing, push
the “RESET” button to set the hours.
4. Push the “SELECT” button, and the minute
digits will start flashing.
5. Push the “RESET” button to set the min-
utes.
6. Push the “SELECT” button and then
release it to start the clock.
1. Coolant temperature display/air intake tem-
perature display
2. Speedometer
3. Tachometer
4. Odometer/tripmeter/fuel reserve tripmeter
5. “SELECT” button
6. “RESET” button
7. Clock
8. Fuel meter
1. Tachometer
2. Tachometer red zone.
1. Clock
2. Speedometer

FEATURES
1-5
Odometer and tripmeter modes
Push the “SELECT” button to switch the dis-
play between the odometer mode “ODO” and
the tripmeter modes “TRIP A” and “TRIP B” in
the following order:
“TRIP A” →“TRIP B” →“ODO” →“TRIP A”
When the fuel amount in the fuel tank
decreases to 3.4 L (0.90 US gal) (0.75
Imp.gal), the left segment of the fuel meter will
start flashing, and the odometer display will
automatically change to the fuel reserve trip-
meter mode “F TRIP” and start counting the
distance traveled from that point. In that case,
push the “SELECT” button to switch the dis-
play between the various tripmeter and odom-
eter modes in the following order:
“F-TRIP” →“TRIP A” →“TRIP B” →“ODO” →
“F-TRIP”
To reset a tripmeter, select it by pushing the
“SELECT” button, and then push the “RESET”
button for at least one second. If you do not
reset the fuel reserve tripmeter manually, it will
reset itself automatically and the display will
return to the prior mode after refueling and
traveling 5 km (3 mi).
Fuel meter
The fuel meter indicates the amount of fuel in
the fuel tank. The display segments of the fuel
meter disappear towards “E” (Empty) as the
fuel level decreases. When only one segment
is left near “E”, refuel as soon as possible.
NOTE:
This fuel meter is equipped with a self-diagno-
sis system. If the electrical circuit is defective,
the following cycle will be repeated until the
malfunction is corrected: “E” (Empty), “F” (Full)
and symbol “ ” will flash eight times, then go
off for approximately 3 seconds. If this occurs,
have a Yamaha dealer check the electrical cir-
cuit.
Coolant temperature mode
The coolant temperature display indicates the
temperature of the coolant.
Push the “RESET” button to switch the coolant
temperature display to the air intake tempera-
ture display.
NOTE:
When the coolant temperature display is
selected, “C” is displayed for one second, and
then the coolant temperature is displayed.
CAUTION:
ECA4S81009
Do not operate the engine if it is over-
heated.
Air intake temperature mode
The air intake temperature display indicates
the temperature of the air drawn into the air fil-
ter case. Push the “RESET” button to switch
the coolant temperature display to the air
intake temperature display.
1. Odometer/tripmeter/fuel reserve tripmeter
1. Fuel meter
1. Coolant temperature display
1. Air intake temperature display

FEATURES
1-6
NOTE:
• Even if the air intake temperature is set to be
displayed, the coolant temperature warning
light comes on when the engine overheats.
• When the key is turned to “ON”, the coolant
temperature is automatically displayed, even
if the air intake temperature was displayed
prior to turning the key to “OFF”.
• When the air intake temperature display is
selected, “A” is displayed for one second,
and then the air intake temperature is dis-
played.
Self-diagnosis device
This model is equipped with a self-diagnosis
device for various electrical circuits.
If any of those circuits are defective, the engine
trouble warning light will come on, and then the
display will indicate a two-digit error code (e.g.,
11, 12, 13).
LCD and tachometer brightness control mode
This function allows you to adjust the bright-
ness of the LCD and the tachometer panel and
needle to suit the outside lighting conditions.
To set the brightness
1. Turn the key to “OFF”.
2. Push and hold the “SELECT” button.
3. Turn the key to “ON”, and then release the
“SELECT” button after five seconds.
4. Push the “RESET” button to select the
desired brightness level.
5. Push the “SELECT” button to confirm the
selected brightness level. The display will
return to the odometer or tripmeter mode.
1. Error code display
1. Tachometer panel
2. Tachometer needle
3. LCD
4. Brightness level

IMPORTANT INFORMATION
1-7
EAS20180
IMPORTANT INFORMATION
EAS20190
PREPARATION FOR REMOVAL AND DISAS-
SEMBLY
1. Before removal and disassembly, remove
all dirt, mud, dust and foreign material.
2. Use only the proper tools and cleaning
equipment.
Refer to "SPECIAL TOOLS" on page 1-10.
3. When disassembling, always keep mated
parts together. This includes gears, cylin-
ders, pistons and other parts that have
been “mated” through normal wear. Mated
parts must always be reused or replaced
as an assembly.
4. During disassembly, clean all of the parts
and place them in trays in the order of dis-
assembly. This will speed up assembly and
allow for the correct installation of all parts.
5. Keep all parts away from any source of fire.
EAS20200
REPLACEMENT PARTS
Use only genuine Yamaha parts for all replace-
ments. Use oil and grease recommended by
Yamaha for all lubrication jobs. Other brands
may be similar in function and appearance, but
inferior in quality.
EAS20210
GASKETS, OIL SEALS AND O-RINGS
1. When overhauling the engine, replace all
gaskets, seals and O-rings. All gasket sur-
faces, oil seal lips and O-rings must be
cleaned.
2. During reassembly, properly oil all mating
parts and bearings and lubricate the oil
seal lips with grease.
EAS20220
LOCK WASHERS/PLATES AND COTTER
PINS
After removal, replace all lock washers/plates
“1” and cotter pins. After the bolt or nut has
been tightened to specification, bend the lock
tabs along a flat of the bolt or nut.
1. Oil
2. Lip
3. Spring
4. Grease

IMPORTANT INFORMATION
1-8
EAS20230
BEARINGS AND OIL SEALS
Install bearings and oil seals so that the manu-
facturer’s marks or numbers are visible. When
installing oil seals “1”, lubricate the oil seal lips
with a light coat of lithium-soap-based grease.
Oil bearings liberally when installing, if appro-
priate.
CAUTION:
ECA13300
Do not spin the bearing with compressed
air because this will damage the bearing
surfaces.
EAS20240
CIRCLIPS
Before reassembly, check all circlips carefully
and replace damaged or distorted circlips.
Always replace piston pin clips after one use.
When installing a circlip “1”, make sure the
sharp-edged corner “2” is positioned opposite
the thrust “3” that the circlip receives.

CHECKING THE CONNECTIONS
1-9
EAS20250
CHECKING THE CONNECTIONS
Check the leads, couplers, and connectors for
stains, rust, moisture, etc.
1. Disconnect:
• Lead
• Coupler
• Connector
2. Check:
• Lead
• Coupler
• Connector
Moisture →Dry with an air blower.
Rust/stains →Connect and disconnect
several times.
3. Check:
• All connections
Loose connection →Connect properly.
NOTE:
If the pin “1” on the terminal is flattened, bend
it up.
4. Connect:
• Lead
• Coupler
• Connector
NOTE:
Make sure all connections are tight.
5. Check:
•Continuity
(with the pocket tester)
NOTE:
• If there is no continuity, clean the terminals.
• When checking the wire harness, perform
steps (1) to (3).
• As a quick remedy, use a contact revitalizer
available at most part stores.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C

SPECIAL TOOLS
1-10
EAS20260
SPECIAL TOOLS
The following special tools are necessary for complete and accurate tune-up and assembly. Use
only the appropriate special tools as this will help prevent damage caused by the use of inappropri-
ate tools or improvised techniques. Special tools, part numbers or both may differ depending on the
country.
When placing an order, refer to the list provided below to avoid any mistakes.
NOTE:
• For U.S.A. and Canada, use part number starting with “YM-”, “YU-”, or “ACC-”.
• For others, use part number starting with “90890-”.
Tool name/Tool No. Illustration Reference
pages
Flywheel puller
90890-01362
Heavy duty puller
YU-33270-B
5-30
Flywheel puller attachment
90890-04089
Crankshaft protector
YM-33282
5-30
Sheave holder
90890-01701
Primary clutch holder
YS-01880-A
5-30, 5-31, 5-
32, 5-34
Piston pin puller set
90890-01304
Piston pin puller
YU-01304
5-62
Radiator cap tester
90890-01325
Radiator pressure tester
YU-24460-01
6-3
Radiator cap tester adapter
90890-01352
Radiator pressure tester adapter
YU-33984
6-3

SPECIAL TOOLS
1-11
Steering nut wrench
90890-01403
Spanner wrench
YU-33975
3-26, 4-53
Damper rod holder
90890-01294
Damping rod holder set
YM-01300
4-45, 4-47
T-handle
90890-01326
YM-01326
4-45, 4-47
Oil filter wrench
90890-01426
YU-38411
3-13
Fork seal driver weight
90890-01367
Replacement hammer
YM-A9409-7
4-47, 4-48
Fork seal driver attachment (ø43)
90890-01374
Replacement 43 mm
YM-A5142-3
4-47
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
3-7
Compression gauge
90890-03081
Engine compression tester
YU-33223
3-11
Tool name/Tool No. Illustration Reference
pages