Yamaha FZ6-SS 2004 User manual

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FZ6-S (S)
SERVICE MANUAL
2003 by Yamaha Motor Co., Ltd.
First edition, August 2003
All rights reserved.
Any reproduction or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.

NOTE:
WARNING
CAUTION:
EAS00002
NOTICE
This manual was produced by the Yamaha Motor Company, Ltd. primarily for use by Yamaha dealers
and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one manu-
al. 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 ve-
hicle unsafe and unfit for use.
Yamaha Motor Company, Ltd. is continually striving to improve all of its models. Modifications and sig-
nificant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers
and will appear in future editions of this manual where applicable.
Designs and specifications are subject to change without notice.
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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 motorcycle operator, a bystander or a person checking or repairing the mo-
torcycle.
A CAUTION indicates special precautions that must be taken to avoid damage
to the motorcycle.
NOTE: A NOTE provides key information to make procedures easier or clearer.

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8
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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.
1The manual is divided into chapters. An abbreviation and symbol in the upper right corner of each
page indicate the current chapter.
Refer to “SYMBOLS”.
2Each chapter is divided into sections. The current section title is shown at the top of each page,
except in Chapter 3 (“PERIODIC CHECKS AND ADJUSTMENTS”), where the sub-section title(s) ap-
pears.
3Sub-section titles appear in smaller print than the section title.
4To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each
removal and disassembly section.
5Numbers are given in the order of the jobs in the exploded diagram. A circled number indicates a
disassembly step.
6Symbols indicate parts to be lubricated or replaced.
Refer to “SYMBOLS”.
7A job instruction chart accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc.
8Jobs requiring more information (such as special tools and technical data) are described sequen-
tially.

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1
3
5
7
9
2
4
8
6
24 25
2321
19 2018
16 1715
1413
11 12
10
GEN
INFO SPEC
ENG
FI ELEC
COOL
CHK
ADJ
TRBL
SHTG
CHAS
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SYMBOLS
The following symbols are not relevant to every
vehicle.
Symbols 1to 9indicate the subject of each
chapter.
1General information
2Specifications
3Periodic checks and adjustments
4Chassis
5Engine
6Cooling system
7Fuel injection system
8Electrical system
9Troubleshooting
Symbols 10 to 17 indicate the following.
10 Serviceable with engine mounted
11 Filling fluid
12 Lubricant
13 Special tool
14 Tightening torque
15 Wear limit, clearance
16 Engine speed
17 Electrical data
Symbols 18 to 23 in the exploded diagrams indi-
cate the types of lubricants and lubrication
points.
18 Engine oil
19 Gear oil
20 Molybdenum-disulfide oil
21 Wheel-bearing grease
22 Lithium-soap-based grease
23 Molybdenum-disulfide grease
Symbols 24 to 25 in the exploded diagrams indi-
cate the following.
24 Apply locking agent (LOCTITE)
25 Replace the part

GENERAL INFORMATION
SPECIFICATIONS
PERIODIC CHECKS AND
ADJUSTMENTS
CHASSIS
ENGINE
COOLING SYSTEM
FUEL INJECTION SYSTEM
ELECTRICAL SYSTEM
TROUBLESHOOTING
GEN
INFO 1
SPEC 2
3
ENG
4
COOL
5
FI
6
CHAS
7
ELEC 8
TRBL
SHTG 9
CHK
ADJ
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TABLE OF CONTENTS

GEN
INFO
CHAPTER 1
GENERAL INFORMATION
MOTORCYCLE 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 FUNCTION 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT INFORMATION 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PREPARATION FOR REMOVAL AND DISASSEMBLY 1-6. . . . . . . . .
REPLACEMENT PARTS 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GASKETS, OIL SEALS AND O-RINGS 1-6. . . . . . . . . . . . . . . . . . . . . . .
LOCK WASHERS /PLATES AND COTTER PINS 1-7. . . . . . . . . . . . . .
BEARINGS AND OIL SEALS 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CIRCLIPS 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECKING THE CONNECTIONS 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GEN
INFO

1-1
MOTORCYCLE IDENTIFICATION GEN
INFO
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GENERAL INFORMATION
MOTORCYCLE IDENTIFICATION
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VEHICLE IDENTIFICATION NUMBER
The vehicle identification number 1is stamped
into the right side of the steering head pipe.
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MODEL LABEL
The model label 1is affixed to the frame. This
information will be needed to order spare parts.

1-2
FEATURES GEN
INFO
7Intake air pressure
sensor
8Throttle position sen-
sor
9Fuel 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 warn-
ing light
19 Lean angle cut-off
switch
1Ignition coil
2Air filter case
3Intake air temperature
sensor
4Fuel delivery hose
5Fuel tank
6Fuel pump
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FEATURES
OUTLINE OF FI SYSTEM
The main function of a fuel supply system is to provide fuel to the combustion chamber at the optimum
air-fuel ratio in accordance with the engine operating conditions and the atmospheric temperature.
In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the combustion
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 me-
ter the fuel through the use of jets have been provided with various auxiliary devices, so that an opti-
mum air-fuel ratio can be achieved to accommodate the constant changes in the operating conditions
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 manner. To accom-
modate 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 re-
quired 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 system (AI sys-
tem) has been placed under computer control together with the FI system in order to realize cleaner
exhaust gases.

1-3
FEATURES GEN
INFO
Illustration is for reference only.
6Throttle position sen-
sor
7Intake air pressure
sensor
8ECU
9Coolant temperature
sensor
10 Crankshaft position
sensor
A Fuel system
B Control system
1Fuel pump
2Pressure regulator
3Fuel injector
4Throttle body
5Intake air temperature
sensor
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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 energizing
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. Con-
versely, the shorter the length of time the injector is energized (injection duration), the lesser the vol-
ume 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 temperature
sensor and coolant temperature sensor enable the ECU to determine the injection duration. The injec-
tion timing is determined through the signals from the crankshaft position sensor. As a result, the vol-
ume of fuel that is required by the engine can be supplied at all times in accordance with the driving
conditions.

1-4
FEATURES GEN
INFO
1 Multi-function display
2 “SELECT” button
3 “RESET” button
4 Engine trouble warning light
NOTE:
INSTRUMENT FUNCTION
Multi-function display
The multi-function display is equipped with the
following:
Sa speedometer (which shows the riding
speed)
San odometer (which shows the total distance
traveled)
Stwo tripmeters (which show the distance
traveled since they were last set to zero)
Sa fuel reserve tripmeter (which shows the
distance traveled since the bottom segment
of the fuel meter started flashing)
Sa tachometer (which shows the engine
speed)
Sa fuel meter
Sa water temperature
Sa clock
Sa intake air temperature
Sa self-diagnosis device
SBe sure to turn the key to “ON” before using the “SELECT” and ”RESET” buttons.
SFor the U.K. only: To switch the speedometer and odometer/tripmeter display between kilometers
and miles, press the “SELECT” button for at least two seconds.
Odometer, tripmeter and tachometer modes
Pushing the “SELECT” button switches the display between the odometer mode “ODO” and the trip-
meter modes “TRIP 1” and “TRIP 2” and the tachometer mode “E” is the following order:
ODO !TRIP 1 !TRIP 2 !(TRIP F) !E !ODO
When approximately 3.6 L of fuel remain in the fuel tank, the bottom segment of the fuel meter will start
flashing, and the odometer display will automatically change to the fuel reserve tripmeter mode “TRIP
F” and start counting the distance traveled from that point. In that case, pushing the “SELECT” button
switches the display between the various tripmeter and odometer modes in the following order:
TRIP-F !E !ODO !TRIP 1 !TRIP 2 !TRIP F
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 (3.1 mi).
Tachometer mode
Displays the digital indication of the engine speed on the odometer section.
Air intake temperature indicator.
When “ODO” is displayed, pressing the “RESET” for a long time allows the indicator to switch displays
between Clock and Air intake temperature. (It activates the clock indication when the main switch is
turned OFF.)
In the Co adjustment mode, the indication automatically changes from clock (Air intake temperature) to
the engine speed.

1-5
FEATURES GEN
INFO
Clock mode
To set the clock:
1. Push the “SELECT” button and “RESET” button together for at least two seconds.
2. When the hour digits start flashing, push the “RESET” button to set the hours.
3. Push the “SELECT” button, and the minute digits will start flashing.
4. Push the “RESET” button to set the minutes.
5. Push the “SELECT” button and then release it to start the clock.

1-6
IMPORTANT INFORMATION GEN
INFO
spring
lip
oil
grease
lip
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IMPORTANT INFORMATION
PREPARATION FOR REMOVAL AND
DISASSEMBLY
1. Before removal and disassembly, eliminate
all dirt, mud, dust and foreign material.
2. Use only the proper tools and cleaning
equipment.
Refer to the “SPECIAL TOOLS”.
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 as-
sembly.
4. During disassembly, clean all of the parts
and place them in trays in the order of disas-
sembly. This will speed up assembly and al-
low for the correct installation of all parts.
5. Keep all parts away from any source of fire.
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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.
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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.

1-7
IMPORTANT INFORMATION GEN
INFO
CAUTION:
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LOCK WASHERS/PLATES AND COTTER
PINS
After removal, replace all lock washers/plates
1and cotter pins. After the bolt or nut has been
tightened to specification, bend the lock tabs
along a flat of the bolt or nut.
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BEARINGS AND OIL SEALS
Install bearings and oil seals so that the
manufacturer’s marks or numbers are visible.
When installing oil seals, lubricate the oil seal
lips with a light coat of lithium-soap-based
grease. Oil bearings liberally when installing, if
appropriate.
1Oil seal
Do not spin the bearing with compressed air
because this will damage the bearing sur-
faces.
1Bearing
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CIRCLIPS
Before reassembly, check all circlips carefully
and replace damaged or distorted circlips. Al-
ways replace piston pin clips after one use.
When installing a circlip 1, make sure the
sharp-edged corner 2is positioned opposite
the thrust 3that the circlip receives.
4Shaft

1-8
CHECKING THE CONNECTIONS GEN
INFO
NOTE:
NOTE:
NOTE:
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CHECKING THE CONNECTIONS
Check the leads, couplers, and connectors for
stains, rust, moisture, etc.
1. Disconnect:
Slead
Scoupler
Sconnector
2. Check:
Slead
Scoupler
Sconnector
Moisture !Dry with an air blower.
Rust/stains !Connect and disconnect sev-
eral times.
3. Check:
Sall connections
Loose connection !Connect properly.
If the pin 1on the terminal is flattened, bend it
up.
4. Connect:
Slead
Scoupler
Sconnector
Make sure all connections are tight.
5. Check:
Scontinuity
(with the pocket tester)
Pocket tester
90890-03112, YU-3112
SIf there is no continuity, clean the terminals.
SWhen checking the wire harness, perform
steps (1) to (3).
SAs a quick remedy, use a contact revitalizer
available at most part stores.

1-9
SPECIAL TOOLS GEN
INFO
NOTE:
1
21
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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 inappropriate 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.
SFor U.S.A. and Canada, use part number starting with “YM-”, “YU-”, or “ACC-”.
SFor others, use part number starting with “90890-”.
Tool No. Tool name/Function Illustration
Flywheel puller
90890-01362
YU-33270-B
Adapter
90890-04089
YM-33282
Flywheel puller
Adapter
This tool is used to remove the generator ro-
tor.
90890-01701
YS-01880-A
Sheave holder
This tool is used to hold the generator rotor
when removing or installing the generator ro-
tor bolt or pickup coil rotor bolt.
90890-01304
YU-01304
Piston pin puller
This tool is used to remove the piston pins.
Radiator cap
tester
90890-01325
YU-24460-01
Adapter
90890-01352
YU-33984
Radiator cap tester
Adapter
These tools are used to check the cooling
system.
90890-01403
YU-33975
Steering nut wrench
This tool is used to loosen or tighten the steer-
ing stem ring nuts.
90890-01460
-01326
Damper rod holder
T-handle
These tool are used for holding the damper
rod when removing or installing the damper
rod.
Pivot shaft
wrench
90890-01471
YM-01471
Pivot shaft wrench
adapter
90890-01476
Pivot shaft wrench
Pivot shaft wrench adapter
This tool is used to loosen or tighten the pivot
adjust bolt and engine mount adjust bolt.