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 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 dealers 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
WARNING
to the vehicle operator, a bystander or a person checking or repairing the vehicle.
CAUTION:
NOTE:
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.
Page 5
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 “2” appear in smaller print than the section title.
• To help identify parts and clarify procedure steps, there are exploded diagrams “3” at the start of each
removal and disassembly section.
• Numbers “4” are given in the order of the jobs in the exploded diagram. A number indicates a disassembly step.
• Symbols “5” indicate parts to be lubricated or replaced.
Refer to “SYMBOLS”.
• A job instruction chart “6” accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc.
• Jobs “7” requiring more information (such as special tools and technical data) are described sequentially.
Page 6
EAS20100
SYMBOLS
The following symbols are used in this manual
for easier understanding.
NOTE:
The following symbols are not relevant to every
vehicle.
CHECKING THE CONNECTIONS................................................................ 1-10
1
SPECIAL TOOLS.......................................................................................... 1-11
Page 11
EAS20130
IDENTIFICATION
EAS20140
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number “1” is stamped
into the right side of the steering head pipe.
1
EAS20150
MODEL LABEL
The model label “1” is affixed to the frame under
the rider seat. This information will be needed to
order spare parts.
IDENTIFICATION
1
1-1
Page 12
FEATURES
EAS20170
FEATURES
ET1D71017
OUTLINE OF THE 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 meter the
fuel through the use of jets have been provided with various auxiliary devices, so that an optimum airfuel 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 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.
12
2021
1. Air temperature sensor
2. ISC (idle speed control) unit
3. Cylinder-#2 intake air pressure sensor
4. Engine temperature sensor
5. Cylinder-#1 right ignition coil
6. Throttle position sensor
7. Cylinder-#1 left ignition coil
8. Cylinder-#1 intake air pressure sensor
9. Fuel pump
10.ECU (electronic control unit)
11.Relay unit (fuel pump relay)
12.EXUP servo motor
13.Speed sensor
14.O
sensor
2
345678 910 11 12
141316191817 16 15
15.Lean angle sensor
16.Spark plug
17.Injector #1
18.Crankshaft position sensor
19.Injector #2
20.Cylinder-#2 right ignition coil
21.Cylinder-#2 left ignition coil
1-2
Page 13
FEATURES
ET1D71018
FI SYSTEM
The fuel pump delivers fuel to the fuel injector via the fuel filter. The pressure regulator maintains the
fuel pressure that is applied to the fuel injector at only 392 kPa (3.92 kg/cm², 55.7 psi). Accordingly,
when the energizing signal from the ECU energizes the fuel 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 fuel injector is energized (injection duration), the greater the volume of fuel that is supplied. Conversely, the shorter the length of time the fuel injector is energized
(injection duration), 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, air temperature sensor,
engine temperature sensor, speed sensor and O
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 accordance with
the driving conditions.
Illustration is for reference only.
sensor enable the ECU to determine the injection
2
6
7
1
A
#2
#1
15
B
1. Pressure regulator
2. Fuel pump
3. Fuel injector
4. Ignition coil
5. ECU (electronic control unit)
6. Air temperature sensor
7. ISC (idle speed control) unit
8. Throttle position sensor
9. O
sensor
2
10.Catalytic converter
11.Engine temperature sensor
12.Crankshaft position sensor
13
2
C
5
8
3
4
9
10
14
11
12
13.Intake air pressure sensor
14.Throttle body
15.Air filter case
A. Fuel system
B. Air system
C. Control system
1-3
Page 14
ET1D71036
INSTRUMENT FUNCTIONS
Multi-function meter unit
EW1D71008
WARNING
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 the engine speed)
• a fuel gauge
• an odometer (which shows the total distance
traveled)
• two tripmeters (which show the distance traveled since they were last set to zero)
• a fuel reserve tripmeter (which shows the distance traveled on the fuel reserve)
• a clock
• a self-diagnosis device
• a brightness control mode
NOTE:
• Be sure to turn the key to “ON” before using the
“SELECT” and “RESET” switches, except for
setting the brightness control mode.
• To switch the odometer, the tripmeters and the
fuel reserve tripmeter displays between kilometers and miles, press the “SELECT” switch
for at least two seconds. (For USA and California only)
1. “SELECT” switch
2. “RESET” switch
Speedometer
1
1. Speedometer
The speedometer shows the riding speed.
When the key is turned to “ON”, the speedometer needle will sweep once across the speed
range and then return to zero in order to test the
electrical circuit.
1-4
Page 15
FEATURES
Tachometer
1
2
1. Tachometer
2. Tachometer red zone
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 tachometer
needle will sweep once across the r/min range
and then return to zero r/min in order to test the
electrical circuit.
EC1D71017
CAUTION:
Do not operate the engine in the tachometer
red zone.
Red zone: 5000 r/min and above
Fuel gauge
1
1. Fuel gauge
The fuel gauge indicates the amount of fuel in
the fuel tank. The needle moves towards “E”
(Empty) as the fuel level decreases. When the
needle reaches “E”, approximately 3.0 L (0.79
US gal) (0.66 Imp.gal) remain in the fuel tank. If
this occurs, refuel as soon as possible.
When the key is turned to “ON”, the fuel gauge
needle will sweep once across the fuel level
range and then return to the current amount in
order to test the electrical circuit.
NOTE:
• Do not allow the fuel tank to empty itself completely.
• The fuel gauge does not indicate the correct
fuel level for the first 5 km/h (3 mi/h) after refueling.
Push the “SELECT” switch to switch the display
between the odometer mode “ODO”, the tripmeter modes “TRIP 1” and “TRIP 2” and the clock
mode in the following order:
ODO → TRIP 1 → TRIP 2 → Clock → ODO
If the fuel level warning light comes on, the
odometer display will automatically change to
the fuel reserve tripmeter mode “F-TRIP” and
start counting the distance traveled from that
point. In that case, push the “SELECT” switch to
switch the display between the various tripmeter, odometer, and clock modes in the following
order:
F-TRIP → TRIP 1 → TRIP 2 → Clock → ODO →
F-TRIP
To reset a tripmeter, select it by pushing the “SE-
LECT” switch, and then push the “RESET”
switch 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).
Clock mode
1. Clock
1-5
Page 16
FEATURES
To set the clock:
1. Push the “SELECT” switch to change the display to the clock mode.
2. Push the “SELECT” and “RESET” switches
together for at least two seconds.
3. When the hour digits start flashing, push the
“RESET” switch to set the hours.
4. Push the “SELECT” switch, and the minute
digits will start flashing.
5. Push the “RESET” switch to set the minutes.
6. Push the “SELECT” switch and then release
it to start the clock.
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
odometer/tripmeter/clock display will indicate a
two-digit error code (e.g., 12, 13, 14).
If the odometer/tripmeter/clock display indicates
any error codes, note the code number, and
then check the vehicle. Refer to “FUEL INJECTION SYSTEM” on page 7-27.
EC1D71018
CAUTION:
If the display indicates an error code, the vehicle should be checked as soon as possible
in order to avoid engine damage.
Select the brightness control mode as follows.
1. Turn the key to “OFF”.
2. Push and hold the “SELECT” switch.
3. Turn the key to “ON”, and then release the
“SELECT” switch after five seconds.
Item number “1” is displayed.
1
2
3
1. Multi-function meter unit panel
2. Item number
3. Brightness level
4. Adjust the multi-function meter unit panel
brightness level by pushing the “RESET”
switch.
5. Push the “SELECT” switch to select the LCD.
Item number “2” is displayed.
Adjust the LCD brightness level by pushing
the “RESET” switch.
Brightness control mode
1
3
4
5
2
1. Multi-function meter unit panel
2. LCD
3. Speedometer needle
4. Tachometer needle
5. Fuel gauge needle
The brightness can be adjusted for the following:
• the multi-function meter unit panel (item number “1”)
• the LCD (item number “2”)
• the speedometer, tachometer, and the fuel gauge needles (item number “3”)
1
2
3
1. LCD
2. Item number
3. Brightness level
6. Push the “SELECT” switch to select the
speedometer, tachometer, and the fuel
gauge needles.
Item number “3” is displayed.
Adjust the brightness level of the speedometer, tachometer, and the fuel gauge needles
by pushing the “RESET” switch.
1-6
Page 17
1
2
3
4
5
1. Speedometer needle
2. Tachometer needle
3. Fuel gauge needle
4. Item number
5. Brightness level
7. Push the “SELECT” switch.
The odometer/tripmeter/clock display will return to the prior mode.
FEATURES
1-7
Page 18
EAS20180
IMPORTANT INFORMATION
EAS20190
PREPARATION FOR REMOVAL AND
DISASSEMBLY
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 1-11.
3. When disassembling, always keep mated
parts together. This includes gears, cylinders,
pistons and other parts that have been “mat-
ed” through normal wear. Mated parts must
always be reused or replaced as an assembly.
IMPORTANT INFORMATION
EAS20210
GASKETS, OIL SEALS AND O-RINGS
1. When overhauling the engine, replace all
gaskets, seals and O-rings. All gasket surfaces, 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.
4. During disassembly, clean all of the parts and
place them in trays in the order of disassembly. 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 replacements. Use oil and grease recommended by
Yamaha for all lubrication jobs. Other brands
may be similar in function and appearance, but
inferior in quality.
1. Oil
2. Lip
3. Spring
4. 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.
1-8
Page 19
EAS20230
BEARINGS AND OIL SEALS
Install bearings and oil seals so that the manufacturer’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 appropriate.
ECA13300
CAUTION:
Do not spin the bearing with compressed air
because this will damage the bearing surfaces.
IMPORTANT INFORMATION
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.
1-9
Page 20
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.
CHECKING THE CONNECTIONS
Pocket tester
90890-03112
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.
Analog pocket tester
YU-03112-C
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)
1-10
Page 21
SPECIAL TOOLS
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 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.
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
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
Tappet adjusting tool (4 mm)
90890-04133
Valve adjustment wrench 3 mm & 4 mm
YM-08035-A
Recommended fuelPremium unleaded gasoline only
Fuel tank capacity17.0 L (4.49 US gal) (3.74 Imp.gal)
Fuel reserve amount3.0 L (0.79 US gal) (0.66 Imp.gal)
Engine oil
Lubrication systemDry sump
TypeYAMALUBE 4 (20W40) or SAE20W40
Recommended engine oil gradeAPI service SG type or higher, JASO standard
MA
Engine oil quantity
Total amount5.20 L (5.50 US qt) (4.58 Imp.qt)
Engine3.2 L (3.38 US qt) (2.82 Imp.qt)
Oil tank2.0 L (2.11 US qt) (1.76 Imp.qt)
Without oil filter cartridge replacement4.10 L (4.33 US qt) (3.61 Imp.qt)
With oil filter cartridge replacement4.90 L (5.18 US qt) (4.31 Imp.qt)
TypeSAE80 API GL-4 Hypoid gear oil
Quantity (disassembled)0.60 L (0.63 US qt) (0.53 Imp.qt)
Quantity0.55 L (0.58 US qt) (0.48 Imp.qt)
Oil filter
Oil filter typeCartridge (paper)
Oil pump
Oil pump typeTrochoid
Inner-rotor-to-outer-rotor-tip clearanceLess than 0.12 mm (0.0047 in)
Limit0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-housing clearance0.09–0.19 mm (0.0035–0.0075 in)
Limit0.26 mm (0.0102 in)
Oil-pump-housing-to-inner-and-outer-rotor
clearance0.06–0.13 mm (0.0024–0.0051 in)
Limit0.20 mm (0.0079 in)
Bypass valve opening pressure80.0–120.0 kPa (11.6–17.4 psi) (0.80–1.20
Inner-rotor-to-outer-rotor-tip clearanceLess than 0.12 mm (0.0047 in)
Limit0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-housing clearance0.10–0.15 mm (0.0039–0.0059 in)
Limit0.22 mm (0.0087 in)
Oil-pump-housing-to-inner-and-outer-rotor
clearance0.04–0.09 mm (0.0016–0.0035 in)
Limit0.160 mm (0.0063 in)
Spark plug (s)
Manufacturer/modelNGK/DPR8EA-9
Manufacturer/modelDENSO/X24EPR-U9
Spark plug gap0.8–0.9 mm (0.031–0.035 in)
Cylinder head
Volume80.90–84.90 cm³ (4.94–5.18 cu.in)
Warpage limit0.03 mm (0.0012 in)
Camshaft
Drive systemGear drive
Crankcase hole inside diameter25.000–25.021 mm (0.9843–0.9851 in)
Camshaft journal diameter (crankcase side)24.957–24.980 mm (0.9826–0.9835 in)
Camshaft to crankcase clearance0.020–0.064 mm (0.0008–0.0025 in)
Camshaft cover hole inside diameter28.000–28.021 mm (1.1024–1.1032 in)
Camshaft journal diameter (camshaft cover side)27.957–27.980 mm (1.1007–1.1016 in)
Camshaft to camshaft cover clearance0.020–0.064 mm (0.0008–0.0025 in)
Camshaft lobe dimensions
Intake A42.532–42.632 mm (1.6745–1.6784 in)
Limit42.432 mm (1.6705 in)
Intake B35.950–36.050 mm (1.4154–1.4193 in)
Limit35.850 mm (1.4114 in)
Exhaust A42.530–42.630 mm (1.6744–1.6783 in) (cylinder
#1)
42.531–42.631 mm (1.6744–1.6784 in) (cylinder
#2)
Limit42.430 mm (1.6705 in) (cylinder #1)
42.431 mm (1.6705 in) (cylinder #2)
Exhaust B35.950–36.050 mm (1.4154–1.4193 in)
Limit35.850 mm (1.4114 in)
2-3
Page 30
ENGINE SPECIFICATIONS
A
B
Rocker arm/rocker arm shaft
Rocker arm inside diameter18.000–18.018 mm (0.7087–0.7094 in)
Limit18.036 mm (0.7101 in)
Rocker arm shaft outside diameter17.976–17.991 mm (0.7077–0.7083 in)
Rocker-arm-to-rocker-arm-shaft clearance0.009–0.042 mm (0.0004–0.0017 in)
Limit0.080 mm (0.0032 in)
Valve, valve seat, valve guide
Valve clearance (cold)
Intake0.00–0.04 mm (0.0000–0.0016 in)
Exhaust0.00–0.04 mm (0.0000–0.0016 in)
Valve dimensions
Valve head diameter A (intake)35.90–36.10 mm (1.4134–1.4213 in)
Valve head diameter A (exhaust)30.90–31.10 mm (1.2165–1.2244 in)
A
Valve seat width C (intake)1.10–1.30 mm (0.0433–0.0512 in)
Limit2.0 mm (0.08 in)
Valve seat width C (exhaust)1.10–1.30 mm (0.0433–0.0512 in)
Limit2.0 mm (0.08 in)
C
Valve margin thickness D (intake)1.15–1.45 mm (0.0453–0.0571 in)
Limit0.4 mm (0.02 in)
Valve margin thickness D (exhaust)1.15–1.45 mm (0.0453–0.0571 in)
Limit0.4 mm (0.02 in)
D
Valve stem diameter (intake)5.975–5.990 mm (0.2352–0.2358 in)
Limit5.945 mm (0.2341 in)
Valve stem diameter (exhaust)5.960–5.975 mm (0.2346–0.2352 in)
Limit5.920 mm (0.2331 in)
Valve guide inside diameter (intake)6.000–6.012 mm (0.2362–0.2367 in)
Limit6.050 mm (0.2382 in)
2-4
Page 31
ENGINE SPECIFICATIONS
Valve guide inside diameter (exhaust)6.000–6.012 mm (0.2362–0.2367 in)
Limit6.050 mm (0.2382 in)
Valve-stem-to-valve-guide clearance (intake)0.010–0.037 mm (0.0004–0.0015 in)
Limit0.080 mm (0.0032 in)
Valve-stem-to-valve-guide clearance (exhaust)0.025–0.052 mm (0.0010–0.0020 in)
Limit0.100 mm (0.0039 in)
Valve stem runout0.010 mm (0.0004 in)
Valve spring
Free length (intake)46.71 mm (1.84 in)
Limit44.71 mm (1.76 in)
Free length (exhaust)46.71 mm (1.84 in)
Limit44.71 mm (1.76 in)
Installed length (intake)32.66 mm (1.29 in)
Installed length (exhaust)32.66 mm (1.29 in)
Spring rate K1 (intake)16.58 N/mm (94.67 lb/in) (1.69 kgf/mm)
Spring rate K2 (intake)21.98 N/mm (125.51 lb/in) (2.24 kgf/mm)
Spring rate K1 (exhaust)16.58 N/mm (94.67 lb/in) (1.69 kgf/mm)
Spring rate K2 (exhaust)21.98 N/mm (125.51 lb/in) (2.24 kgf/mm)
Installed compression spring force (intake)217.00–249.00 N (48.78–55.98 lb) (22.13–
25.39 kgf)
Installed compression spring force (exhaust)217.00–249.00 N (48.78–55.98 lb) (22.13–
25.39 kgf)
Spring tilt (intake)2.5 °/2.0 mm
Spring tilt (exhaust)2.5 °/2.0 mm
Winding direction (intake)Clockwise
Winding direction (exhaust)Clockwise
Valve lifter
Valve lifter outside diameter (intake)22.962–22.974 mm (0.9040–0.9045 in)
Valve lifter outside diameter (exhaust)22.962–22.974 mm (0.9040–0.9045 in)
Valve lifter hole inside diameter (intake)23.000–23.021 mm (0.9055–0.9063 in)
Valve lifter hole inside diameter (exhaust)23.000–23.021 mm (0.9055–0.9063 in)
Valve-lifter-to-valve-lifter-hole clearance0.026–0.059 mm (0.0010–0.0023 in)
Valve push rod
Valve push rod 1 length286.5 mm (11.280 in)
Valve push rod 2 length288.5 mm (11.358 in)
2-5
Page 32
ENGINE SPECIFICATIONS
Valve push rod runout0.3 mm (0.012 in)
Cylinder
Bore100.000–100.010 mm (3.9370–3.9374 in)
Taper limit0.050 mm (0.0020 in)
Out of round limit0.050 mm (0.0020 in)
Piston
Piston-to-cylinder clearance0.025–0.050 mm (0.0010–0.0020 in)
Limit0.15 mm (0.0059 in)
Diameter D99.960–99.975 mm (3.9354–3.9360 in)
Height H10.0 mm (0.39 in)
H
D
Offset0.50 mm (0.0197 in)
Piston pin bore inside diameter23.004–23.015 mm (0.9057–0.9061 in)
Limit23.045 mm (0.9073 in)
Piston pin outside diameter22.991–23.000 mm (0.9052–0.9055 in)
Limit22.971 mm (0.9044 in)
Piston-pin-to-piston-pin-bore clearance0.004–0.024 mm (0.00016–0.00094 in)
Limit0.074 mm (0.00291 in)
Piston ring
Top ring
Ring typeBarrel
Dimensions (B × T)1.20 × 3.80 mm (0.05 × 0.15 in)
B
T
End gap (installed)0.20–0.35 mm (0.0079–0.0138 in)
Limit0.55 mm (0.0217 in)
Ring side clearance0.030–0.080 mm (0.0012–0.0032 in)
Limit0.120 mm (0.0047 in)
2nd ring
Ring typeTaper
Dimensions (B × T)1.20 × 4.00 mm (0.05 × 0.16 in)
B
T
End gap (installed)0.45–0.60 mm (0.0177–0.0236 in)
Limit0.95 mm (0.0374 in)
Ring side clearance0.030–0.070 mm (0.0012–0.0028 in)
Limit0.120 mm (0.0047 in)
2-6
Page 33
ENGINE SPECIFICATIONS
Oil ring
Dimensions (B × T)2.50 × 3.40 mm (0.10 × 0.13 in)
B
T
End gap (installed)0.20–0.70 mm (0.0079–0.0276 in)
Width A105.80–106.20 mm (4.165–4.181 in)
Runout limit C0.040 mm (0.0016 in)
Big end side clearance D0.320–0.474 mm (0.0126–0.0187 in)
Big end radial clearance E0.037–0.074 mm (0.0015–0.0029 in)
Limit0.09 mm (0.0035 in)
)0.050–0.074 mm (0.0020–0.0029 in)
Journal oil clearance (using plastigauge
Limit0.10 mm (0.0039 in)
Resistance4.0–6.0 kΩ/blue-black
Output voltage (at idle)0.63–0.73 V
Fuel injection sensor
Crankshaft position sensor resistance248–372 Ω
Intake air pressure sensor output voltage3.75–4.25 V
Engine temperature sensor resistance0.90–1.10 kΩ at 100 °C (212 °F)
Disc outside diameter × thickness320.0 × 6.0 mm (12.60 × 0.24 in)
Brake disc thickness limit5.5 mm (0.22 in)
Brake disc deflection limit0.15 mm (0.0059 in)
Brake pad lining thickness (inner)5.8 mm (0.23 in)
Limit0.8 mm (0.03 in)
Brake pad lining thickness (outer)5.8 mm (0.23 in)
Limit0.8 mm (0.03 in)
Master cylinder inside diameter12.7 mm (0.50 in)
Caliper cylinder inside diameter41.30 mm (1.63 in)
Recommended fluidDOT 4
Steering
Steering bearing typeTaper roller bearing
Lock to lock angle (left)35.0 °
Lock to lock angle (right)35.0 °
Front suspension
TypeTelescopic fork
Spring/shock absorber typeCoil spring/oil damper
Front fork travel130.0 mm (5.12 in)
Fork spring free length273.9 mm (10.78 in)
Limit268.4 mm (10.57 in)
Collar length230.0 mm (9.06 in)
Installed length268.9 mm (10.59 in)
Spring rate K110.0 N/mm (57.1 lb/in) (1.02 kgf/mm)
Spring stroke K10.0–30.0 mm (0.00–1.18 in)
Spring rate K212.0 N/mm (68.5 lb/in) (1.22 kgf/mm)
Spring stroke K230.0–130.0 mm (1.18–5.12 in)
Inner tube outer diameter46.0 mm (1.81 in)
Inner tube bending limit0.2 mm (0.01 in)
Optional spring availableNo
2-11
Page 38
CHASSIS SPECIFICATIONS
Recommended oilFork oil 10WT
Quantity571.0 cm³ (19.31 US oz) (20.10 Imp.oz)
Level124.0 mm (4.88 in)
Rear suspension
TypeSwingarm (link suspension)
Spring/shock absorber typeCoil spring/gas-oil damper
Rear shock absorber assembly travel50.0 mm (1.97 in)
Spring free length180.0 mm (7.09 in)
Limit176.4 mm (6.94 in)
Installed lengthXV19S(C)/XV19(C)/XV19M(C):
171.0 mm (6.73 in)
XV19CTS(C)/XV19CT(C)/XV19CTM(C):
165.0 mm (6.50 in)
Spring rate K1176.50 N/mm (1007.82 lb/in) (18.00 kgf/mm)
Spring stroke K10.0–50.0 mm (0.00–1.97 in)
Optional spring availableNo
Enclosed gas/air pressure (STD)0.98 MPa (139.4 psi) (9.8 kgf/cm²)
Spring preload adjusting positionsInstalled spring length
Minimum162.0 mm (6.38 in)
StandardXV19S(C)/XV19(C)/XV19M(C):
171.0 mm (6.73 in)
XV19CTS(C)/XV19CT(C)/XV19CTM(C):
165.0 mm (6.50 in)
Maximum171.0 mm (6.73 in)
Swingarm
Swingarm end free play limit (radial)1.0 mm (0.04 in)
Swingarm end free play limit (axial)1.0 mm (0.04 in)
Drive belt
Model/manufacturerUBD-0732/GATES CORPORATION
Drive belt slack (on the sidestand)7.5–13 mm (0.30–0.51 in)
Drive belt slack (on a suitable stand)14–21 mm (0.55–0.83 in)
Model/manufacturerF4T38971/MITSUBISHI
Standard output14.0 V 32.0 A 5000 r/min
Stator coil resistance0.112–0.168 Ω
Rectifier/regulator
Regulator typeSemi conductor-short circuit
Model/manufacturerFH012AA/SHINDENGEN
No load regulated voltage14.2–14.8 V
Rectifier capacity50.0 A
Withstand voltage40.0 V
Battery
ModelGT14B-4
Voltage, capacity12 V, 12.0 Ah
ManufacturerGS YUASA
Ten hour rate amperage1.20 A
Headlight
Bulb typeHalogen bulb
Bulb voltage, wattage × quantity
Low beam headlight12 V, 51.0 W × 1
High beam headlight12 V, 55.0 W × 1
Tail/brake lightLED
Front turn signal/position light12 V, 23 W/8.0 W × 2
Rear turn signal light12 V, 21.0 W × 2
License plate light12 V, 5.0 W
Meter lightingLED
2-13
Page 40
ELECTRICAL SPECIFICATIONS
Indicator light
Neutral indicator lightLED
Turn signal indicator lightLED
High beam indicator lightLED
Fuel level warning lightLED
Engine trouble warning lightLED
Electric starting system
System typeConstant mesh
Starter motor
Model/manufacturer1D7/MORIC
Power output0.90 kW
Armature coil resistance0.0081–0.0099 Ω
Brush overall length9.8 mm (0.39 in)
Limit5.00 mm (0.20 in)
Brush spring force7.36–11.04 N (26.49–39.74 oz) (750–1126 gf)
Commutator diameter28.5 mm (1.12 in)
Limit27.5 mm (1.08 in)
Mica undercut (depth)1.50 mm (0.06 in)
Starter relay
Model/manufacturer2768079-A/JIDECO
Amperage180.0 A
Coil resistance4.18–4.62 Ω
Horn
Horn typeEddy
Quantity2 pcs
Model/manufacturerYP-12/NIKKO
Maximum amperage2.0 A
Coil resistance0.94–0.98 Ω
Performance95–115 dB/2m
Turn signal relay
Relay typeSemi transistor
Model/manufacturerFB246H/DENSO
Built-in, self-canceling deviceYes
Turn signal blinking frequency75.0–95.0 cycles/min
Wattage21(23) W × 2 + LED × 2
Fuel gauge
Model/manufacturer1D7/YAMAHA
Sender unit resistance (full)9–11 Ω
Sender unit resistance (empty)213–219 Ω
Model/manufacturer5PX/DENSO
Resistance at 100°C898.4–1098.0 Ω
Fuses
Main fuse50.0 A
Headlight fuse20.0 A
Taillight fuse10.0 A
Signaling system fuse10.0 A
Ignition fuse25.0 A
Auxiliary DC connector fuse3.0 A
ECU fuse10.0 A
Fuel injection system fuse15.0 A
Backup fuse10.0 A
Reserve fuse25.0 A
Reserve fuse20.0 A
Reserve fuse15.0 A
Reserve fuse10.0 A
Reserve fuse3.0 A
2-15
Page 42
EAS20320
TIGHTENING TORQUES
EAS20330
GENERAL TIGHTENING TORQUE
SPECIFICATIONS
This chart specifies tightening torques for standard fasteners with a standard ISO thread pitch.
Tightening torque specifications for special components or assemblies are provided for each
chapter of this manual. To avoid warpage, tighten multi-fastener assemblies in a crisscross pattern and progressive stages until the specified
tightening torque is reached. Unless otherwise
specified, tightening torque specifications require clean, dry threads. Components should be
at room temperature.
TIGHTENING TORQUES
A. Distance between flats
B. Outside thread diameter
General tightening
A (nut) B (bolt)
torques
Nmm·kgft·lb
10 mm6 mm60.64.3
12 mm8 mm151.511
14 mm10 mm303.022
17 mm12 mm555.540
19 mm14 mm858.561
22 mm16 mm13013.094
2-16
Page 43
EAS20340
ENGINE TIGHTENING TORQUES
TIGHTENING TORQUES
Item
Thread
size
Q’tyTightening torqueRemarks
Cylinder head nutM12860 Nm (6.0 m·kg, 43 ft·lb)
Cylinder head stud bolt (exhaust
pipe)
M8415 Nm (1.5 m·kg, 11 ft·lb)
Spark plugM12418 Nm (1.8 m·kg, 13 ft·lb)
Engine temperature sensor—120 Nm (2.0 m·kg, 14 ft·lb)
Rocker arm base boltM6410 Nm (1.0 m·kg, 7.2 ft·lb)
Rocker arm base boltM8824 Nm (2.4 m·kg, 17 ft·lb)
Cylinder head cover boltM62810 Nm (1.0 m·kg, 7.2 ft·lb)
Connecting rod bolt (1st)M8415 Nm (1.5 m·kg, 11 ft·lb)
Connecting rod bolt (final)M84Specified angle 125–135°
Right balancer driven gear boltM10140 Nm (4.0 m·kg, 29 ft·lb)
Left balancer drive gear boltM10140 Nm (4.0 m·kg, 29 ft·lb)
E
See
NOTE.
M
See
NOTE.
M
E
E
Left balancer driven gear housing
screw
M6610 Nm (1.0 m·kg, 7.2 ft·lb)
Left balancer weight boltM6310 Nm (1.0 m·kg, 7.2 ft·lb)
1. First, tighten the lower ring nut to approximately 52 Nm (5.2 m·kg, 37 ft·lb) with a torque wrench, then
loosen the lower ring nut completely.
2. Retighten the lower ring nut to 18 Nm (1.8 m·kg, 13 ft·lb) with a torque wrench.
2-26
Page 53
LUBRICATION POINTS AND LUBRICANT TYPES
EAS20360
LUBRICATION POINTS AND LUBRICANT TYPES
EAS20370
ENGINE
Lubrication pointLubricant
Oil seal lips
O-rings
Bearings
Cylinder head nuts and washers
Connecting rod small end and big end
Crankshaft journals
Piston surfaces
Piston pins
Connecting rod bolts
Balancer idle gear inner surface and balancer idle gear shaft
Left balancer driven gear inner surface
Right balancer
Gasket (left balancer driven gear housing)
Flange bolts (left balancer drive gear and right balancer driven gear)
Camshaft cam lobes and camshaft journals
LS
LS
E
E
E
M
E
E
M
E
M
M
LS
E
M
Flange bolt (camshaft gear)
Valve push rod end balls
Valve stems (intake and exhaust)
Valve stem ends (intake and exhaust)
Valve lifters
Rocker arms
Rocker arm shafts
Camshaft (front and rear cylinders)
Oil pump rotors (inner and outer) and oil pump housing
Oil pump driven gear shaft
Crankcase stud bolt ends
Starter clutch idle gear shaft
Starter clutch idle gear inner surface
Starter clutch gear inner surface and outer surface
Generator shaft journal
E
E
M
E
E
E
E
E
LS
E
E
E
E
E
E
2-27
Page 54
LUBRICATION POINTS AND LUBRICANT TYPES
Lubrication pointLubricant
Primary driven gear inner surface
Clutch push rods and ball
Clutch boss nut and washer
Transmission gears (wheel and pinion) and collar
Drive pulley nut and washer
Shift forks and shift fork guide bars
Shift drum
Shift shaft and shift shaft oil seal
Shift fork pawl
Crankcase mating surface
Stator coil lead grommet
Crankshaft position sensor lead grommet
E
LS
E
M
E
E
E
LS
M
Yamaha bond
No.1215 (Three Bond
®
No.1215
)
Yamaha bond
No.1215 (Three Bond
®
No.1215
)
Yamaha bond
No.1215 (Three Bond
®
No.1215
)
2-28
Page 55
EAS20380
CHASSIS
LUBRICATION POINTS AND LUBRICANT TYPES
Lubrication pointLubricant
Steering bearings and upper bearing dust cover lip
Lower bearing dust seal lip
Front wheel oil seal lips (left and right)
Rear wheel oil seal lips
Rear wheel drive hub oil seal lip
Rear wheel drive hub mating surface
Tube guide (throttle grip) inner surface and throttle cables
Brake lever pivoting point and metal-to-metal moving parts
Clutch lever pivoting point and metal-to-metal moving parts
Brake pedal shaft pivoting point
Shift pedal pivoting point
Passenger footrest pivoting point and ball
Sidestand pivoting point and metal-to-metal moving parts
Dowel pins (rear fender stay)
Pivot shaft
LS
LS
LS
LS
LS
LS
LS
LS
LS
LS
LS
LS
LS
LS
LS
Swingarm pivoting point, collar flange circumference, and oil seal inner
surface
Rear shock absorber bushings and O-rings
Swingarm, relay arm bearings, and oil seal lips
Connecting arm bushings and O-rings
Rear wheel axle
Clutch master cylinder push rod pin and contact surface
LS
LS
LS
LS
LS
LS
2-29
Page 56
LUBRICATION POINTS AND LUBRICANT TYPES
2-30
Page 57
LUBRICATION SYSTEM CHART AND DIAGRAMS
EAS20390
LUBRICATION SYSTEM CHART AND DIAGRAMS
EAS20400
ENGINE OIL LUBRICATION CHART
2221
20
23
1918
17
16
15
9
8
14
11
9
14
10
12
13
8
7
6
5
4
2
3
1
2-31
Page 58
LUBRICATION SYSTEM CHART AND DIAGRAMS
1. Oil strainer (transfer gear case)
2. Oil pump
3. Oil tank
4. Drive axle
5. Main axle
6. Oil strainer (crankcase)
7. Balancer
8. Front cylinder head cover
9. Rear cylinder head cover
10. Rear cylinder camshaft
11. Front cylinder camshaft
12. Rear valve lifter case
13. Front valve lifter case
14. Push rod
15. Crankshaft
16. Camshaft sprocket cover
17. Generator shaft
18. Generator cover
19. Left crankcase
20. Oil filter cartridge bracket
21. Oil filter cartridge
22. Right crankcase
23. Oil cooler
2-32
Page 59
LUBRICATION SYSTEM CHART AND DIAGRAMS
EAS20410
LUBRICATION DIAGRAMS
2
A
B
A
1
B
8
9
10
A-A
B-B
3
E
E
4
D
11
E-E
C
D
7
8
4
D-D
6
5
5
C
2-33
Page 60
1. Oil tank
2. Dipstick
3. Oil pipe 2
4. Oil delivery pipe 1
5. Oil filter cartridge
6. Oil delivery pipe 2
7. Oil pipe 3
8. Oil pipe 4
9. Oil pipe 5
10. Oil strainer (oil tank)
11. Oil delivery pipe 3
LUBRICATION SYSTEM CHART AND DIAGRAMS
2-34
Page 61
LUBRICATION SYSTEM CHART AND DIAGRAMS
3
3
A
A
2
B
1
5
B
4
6
C
C
B-B
D
7
D
2-35
7
D-DC-C
6
Page 62
1. Valve lifter
2. Push rod
3. Rocker arm shaft
4. Oil pipe 1
5. Crankshaft
6. Oil pipe (“F” mark)
7. Oil pipe (“R” mark)
LUBRICATION SYSTEM CHART AND DIAGRAMS
2-36
Page 63
LUBRICATION SYSTEM CHART AND DIAGRAMS
1
A-A
AA
2
3
4
2-37
Page 64
1. Oil pipe 1
2. Oil pump
3. Oil strainer (crankcase)
4. Joint pipe
LUBRICATION SYSTEM CHART AND DIAGRAMS
2-38
Page 65
LUBRICATION SYSTEM CHART AND DIAGRAMS
1
2
A
4
3
2-39
Page 66
1. Main axle
2. Drive axle
3. Oil strainer (crankcase)
4. Oil pump
A. To the oil filter cartridge
LUBRICATION SYSTEM CHART AND DIAGRAMS
2-40
Page 67
LUBRICATION SYSTEM CHART AND DIAGRAMS
1
5
B
B-B
5
B
A
1
A
A
2
4
3
2-41
Page 68
LUBRICATION SYSTEM CHART AND DIAGRAMS
1. Oil pipe 5
2. Transfer gear oil pump
3. Oil strainer (transfer gear case)
4. Middle drive shaft
5. Oil strainer (oil tank)
A. From the oil pump
2-42
Page 69
LUBRICATION SYSTEM CHART AND DIAGRAMS
1
2
2-43
Page 70
1. Transfer gear oil pump
2. Middle driven shaft
LUBRICATION SYSTEM CHART AND DIAGRAMS
2-44
Page 71
EAS20430
CABLE ROUTING
CABLE ROUTING
1
B-BC-C
C
1
A
1
B
A
234
B
5
5
5
6
7
D-D
A
5
C
D
C
D
B
D
5
E
6
7
E
F
F
1
10
11
6
7
6
7
F-F
G
E
F
8
9
2-45
Page 72
1. Clutch hose
2. Right handlebar switch lead
3. Main switch
4. Left handlebar switch lead
5. Front brake hose
6. Throttle cable (decelerator cable)
7. Throttle cable (accelerator cable)
8. Horn 1 lead
9. Horn 1
10. Rear brake light switch
11. Rear brake light switch lead
A. Cross the left and right handlebar switch leads.
Either lead can be routed on top.
B. 70 mm (2.76 in)
C. 5
–25°
D. 1 0–30°
E. Fasten the rear brake light switch lead with the
plastic locking tie. Face the end of the plastic
locking tie inward, and then cut off the excess end
of the tie.
F. Make sure that there is no slack in the rear brake
light switch lead in the area shown in the illustration.
G. Fasten the rear brake light switch lead with the
plastic locking tie. Face the end of the plastic
locking tie downward, and then cut off the excess
end of the tie.
CABLE ROUTING
2-46
Page 73
CABLE ROUTING
G
1
2
B
C
E
G
D
9
10
I
5
4
A
E
3
F
8
G
F
F
6
H
7
11
J
E
A
B
C
1
B
2
D
B-B
A
8
6
G-GF-F
D
4
2
1
C
3
K
2
3
12
1
2
D-D
L
E-E
2-47
Page 74
1. Main switch lead
2. Right handlebar switch lead
3. Wire harness
4. Left handlebar switch lead
5. Air temperature sensor lead
6. Front left turn signal/position light lead
7. Headlight lead
8. Front right turn signal/position light lead
9. Headlight coupler (high beam)
10. Headlight coupler (low beam)
11. Air temperature sensor
12. Main switch
A. View with headlight lens unit removed.
B. Place the joint coupler behind the leads.
C. Place the sections of the handlebar switch leads
that are not covered by their protective sleeves in
the rear of the headlight housing.
D. Fasten the headlight leads, front turn
signal/position light leads, and accessory light lead
with the holders along the side of the headlight
housing.
E. Place the headlight leads, front turn signal/position
light leads, and accessory light lead near the base
of the holder.
F. 30 mm (1.18 in)
G. View from rear of headlight lens unit
H. Less than 20 mm (0.79 in). Fasten the headlight
lead (low beam) with the holder, making sure to
fasten the protective sleeve of the lead, not the lead
itself.
I.Route the headlight lead (high beam) between the
headlight coupler (low beam) and the stay.
J. Route the headlight lead (high beam) behind the
headlight lead (low beam).
K. Secure the plastic band by inserting the projection
on the band into the hole in the headlight housing.
L. Face the end of the plastic band downward.
CABLE ROUTING
2-48
Page 75
CABLE ROUTING
B-B
6
A
S
TTT
20
3
B
A
C
B
21
D
C
D
D
CC
B
S
RRRR
3
4
A-A
5
4
3
2
C-C
U
3
4
89
7
E
F
10
A
E
1
Q
19
18
L
J
J
N
M
H
I
P
H
K
F
F
12
13
14
G
G
U
T
11
4
D-D
H
I
J
3
G
17
O
1516
14
H-H
V
AH
K
G-G
J-J
O
AG
14
AF
F-F
I
14
22
AE
14
AD
28
AC
Z
AB
E
K
AA
V
W
X
25
Y
26
27
Y
Z
24
23
2-49
Page 76
CABLE ROUTING
1. EXUP servo motor
2. Fuse box
3. Wire harness
4. Fuel outlet hose
5. Cylinder-#1 right spark plug cap
6. Cylinder-#1 right ignition coil
7. Cylinder-#2 intake air pressure sensor coupler
8. Fuel sender (fuel tank) coupler
9. Meter assembly coupler
10. Throttle cable
11. Front brake hose
12. Cylinder-#2 right spark plug cap
13. Cylinder-#1 left ignition coil
14. Clutch pipe
15. Neutral switch lead
16. Stator coil lead
17. Speed sensor lead
18. O
sensor lead
2
19. EXUP cable
20. Cylinder-#1 right spark plug lead
21. Cylinder-#1 left spark plug lead
22. ISC (idle speed control) unit inlet hose
23. Cylinder-#2 ISC (idle speed control) unit outlet
hose
24. Cylinder-#1 ISC (idle speed control) unit outlet
hose
25. Sub-wire harness 3 coupler
26. Cylinder-#2 right spark plug lead
27. Sub-wire harness 4 coupler
28. Cylinder-#2 left spark plug lead
A. Fasten the cylinder-#1 left and right spark plug
leads, fuel outlet hose, wire harness and the fuel
tank damper with the plastic locking tie. Install the
plastic locking tie in the rear slot of the fuel tank
damper.
B. Fasten the fuel outlet hose, wire harness, and fuel
tank damper with the plastic locking tie. Install the
plastic locking tie in the front slot of the fuel tank
damper and make sure that the end of the damper
is aligned with the edge of the flat section on the
outside of the frame.
C. Fasten the cylinder-#1 left and right ignition coil
leads, engine temperature sensor lead, and throttle
position sensor lead to the guide on the engine
bracket (right upper side) with the plastic locking tie.
Face the end of the plastic locking tie rearward, and
then cut off the excess end of the tie.
D. Fasten sub-wire harness 2 with the plastic locking
tie.
E. Align the positioning tape on the wire harness with
the top of the frame.
F. 0
–15 mm (0–0.59 in)
G. Route the throttle cables behind the front brake
hose.
H. Make sure that the wire harness is not twisted
between the fuel tank and the headlight assembly.
I. Position the cylinder-#2 left and right spark plug
leads, sub-wire harness 2 coupler and sub-wire
harness 4 coupler on top of the guide.
J. Fasten the wire harness and the cylinder-#2 left
and right spark plug leads with a plastic locking tie,
making sure to install the tie just past the end of the
protective tube of the wire harness. Face the end of
the plastic locking tie inward, and then cut off the
excess end of the tie.
K. To the throttle position sensor
L. To the fuel injector and engine temperature sensor
M. To the neutral switch
N. To the speed sensor
O. Fasten the stator coil lead with the plastic locking
ties. Face the end of each plastic locking tie
outward, and then cut off the excess end of the tie.
P. To the rear brake caliper
Q. Install the O
sensor bracket.
O
2
R. Outside of the frame
S. Position the buckle of the plastic locking tie to the
inside of the frame. Face the end of the plastic
locking tie upward, and then cut off the excess end
of the tie.
T. Inside of the frame
U. Position the buckle of the plastic locking tie to the
inside of the frame.
V. To the wire harness
W. To the cylinder-#2 right spark plug
X. Right side
Y. Position the sub-wire harness 3 coupler and the
sub-wire harness 4 coupler between the cylinder-
#2 right spark plug lead and the cylinder-#1 ISC
unit outlet hose.
Z. Face the ends of the hose clamp outward, angled
45
° downward.
AA.Route the cylinder-#2 right spark plug lead under
the sub-wire harness 4.
AB.Face the ends of the hose clamp downward.
AC.Route the cylinder-#2 left spark plug lead under the
cylinder-#2 ISC unit outlet hose.
AD.Left side
AE.To the cylinder-#2 left spark plug
AF. Install the clutch pipe onto the clutch release
cylinder, making sure that the pipe contacts the
projection on the cylinder.
AG. To the O
AH.Align the cutout in the clutch pipe union bolt cap
with the projection on the clutch release cylinder.
sensor coupler completely onto the
2
sensor
2
2-50
Page 77
CABLE ROUTING
1
D
A
B
A
B
2
3
A
B
C
4
5
E
F
6
G
AA
21
C
G
G
H
F
C
20
22
H
19
18
U
T
17
S
16
R
26272829303132
AB
7
8
I
9
10
24
25
V
11
J
E
K
23
24
D
P
D
N
OQ
33
H
131415
D-D
LMN
12
151618
A-A
AC
36
AD
S
AA
X
Z
Y
F
W
E
3
2
1
B-B
16
15
34
1
D
1835
G-G
D
R
Q
O
C-C
2-51
Page 78
CABLE ROUTING
1. Clutch hose
2. Throttle cable (decelerator cable)
3. Throttle cable (accelerator cable)
4. Cylinder-#2 left spark plug cap
5. Cylinder-#1 left spark plug cap
6. Sub-wire harness 1
7. Rectifier/regulator
8. Crankshaft position sensor lead
9. Stator coil lead
10. Rectifier/regulator lead
11. Lean angle sensor
12. Horn 2 lead
13. Horn 2
14. Sidestand switch
15. Horn 1 lead
16. Rear brake light switch lead
17. Horn 1
18. Starter motor lead
19. Clutch pipe
20. Fuel tank breather/overflow hose
21. Rollover valve
22. Front brake hose
23. Headlight assembly
24. Front fork
25. Frame
26. Main fuse
27. Diode 1
28. Relay unit
29. Turn signal relay
30. Headlight relay
31. Starter relay
32. EXUP servo motor
33. EXUP cable
34. Speed sensor lead
35. Wire harness
36. Canister
A. Route the throttle cables to the inside of the clutch
hose.
B. Pass the cylinder-#2 left spark plug lead through
the guide.
C. 30
–40 mm (1.18–1.57 in)
D. Position the buckle of the plastic locking tie to the
inside of the frame.
E. Fasten the crankshaft position sensor lead, neutral
switch lead, and sidestand switch lead with the
holders.
F. Fasten the starter motor lead, speed sensor lead,
and wire harness with the holders.
G. Route sub-wire harness 1 to the inside of the
frame.
H. To the tail/brake light
I. Fasten the starter motor lead, horn 1 lead, rear
brake light switch lead, sidestand switch lead, and
crankshaft position sensor lead with the plastic
locking tie.
J. Make sure that there is no slack in the stator coil
lead and rectifier/regulator lead in the area shown
in the illustration.
K. Fasten the stator coil lead and rectifier/regulator
lead with the plastic locking tie. Face the end of the
plastic locking tie outward, and then cut off the
excess end of the tie.
L. Fasten the lean angle sensor lead, starter motor
lead, horn 1 lead, rear brake light switch lead, and
sidestand switch lead with the holder.
M. Route the starter motor lead, horn 1 lead, rear
brake light switch lead, and sidestand switch lead to
the inside of the frame boss.
N. Fasten the starter motor lead, horn 1 lead, rear
brake light switch lead, and sidestand switch lead
with the plastic locking tie. Face the end of the
plastic locking tie outward, and then cut off the
excess end of the tie.
O. Fasten the starter motor lead, horn 1 lead, and rear
brake light switch lead with the plastic locking tie,
and then face the end of the tie outward. Be sure to
install the plastic locking tie behind the frame cross
member and to fasten the rear brake light switch
lead at the white tape.
P. Route the starter motor lead, horn 1 lead, and rear
brake light switch lead along the frame in the area
shown in the illustration, making sure not to cross
the leads.
Q. Align the positioning tape on the starter motor lead
with the engine mounting bolt (front lower side).
R. Pass the fuel tank breather/overflow hose through
the horn 1 bracket, making sure to position the end
of the hose as shown in the illustration.
S. Fasten the starter motor lead, horn 1 lead, and rear
brake light switch lead with the plastic locking tie,
and then face the end of the tie inward.
T. Fasten the horn 1 lead, rear brake light switch lead,
and starter motor lead with the plastic locking tie.
Face the end of the plastic locking tie inward, and
then cut off the excess end of the tie.
U. Route the horn 1 lead to the rear of the starter
motor lead.
V. Pass the throttle cables through the cable guides
as shown in the illustration.
W. Install the lead cover, making sure not to pinch the
stator coil lead and rectifier/regulator lead.
X. Pass the plastic locking tie through the hole in the
battery box projection, and then fasten the wire
harness with the tie.
Y. Fasten the stator coil lead at the white tape with the
plastic locking tie.
Z. Fasten the stator coil lead with the plastic locking
ties.
AA.Pass the plastic locking tie through the hole in the
battery box projection, and then fasten the wire
harness with the tie.
AB.Route the wire harness along the side of the fuse
box/starter relay bracket.
AC.For California only
AD.Route the horn 1 lead to the rear of the canister.
2-52
Page 79
CABLE ROUTING
2-53
Page 80
CABLE ROUTING
1. Meter assembly coupler
2. Cylinder-#2 intake air pressure sensor coupler
3. Cylinder-#1 right spark plug cap
4. Wire harness
5. Negative battery lead
6. EXUP servo motor
7. Fuse box
8. Starter motor lead
9. Positive battery lead
10. Sub-wire harness 1
11. ECU (electronic control unit)
12. Cylinder-#1 left spark plug cap
13. Cylinder-#1 intake air pressure sensor coupler
14. Fuel sender (fuel tank) coupler
15. Neutral switch lead
16. Sidestand switch lead
17. Crankshaft position sensor lead
18. Speed sensor lead
19. Fuel hose (fuel tank to fuel hose joint)
20. Fuel return hose (fuel return pipe to sub-fuel tank)
21. Air vent hose (fuel pump to fuel hose joint)
22. Fuel outlet hose
23. Frame
24. Oil tank
25. Sub-fuel tank
26. Battery
27. Main fuse
28. Fuel pump lead
A. Do not pinch the leads between the fuel tank
bracket and the frame when installing the bracket.
B. Pass the plastic locking ties through the holes in
the frame damper, and then fasten the wire harness
and damper with the ties. Face the end of each
plastic locking tie upward, and then cut off the
excess end of the tie.
C. Align the white tape on the wire harness with the
frame cross member.
D. 20 mm (0.79 in)
E. Fasten the wire harness with the plastic locking tie.
Face the end of the plastic locking tie upward, and
then cut off the excess end of the tie.
F. Route the wire harness along the frame.
G. Fasten the wire harness with the plastic locking tie,
making sure to align the tie with the line on the
rubber damper. Face the end of the plastic locking
tie upward, and then cut off the excess end of the
tie.
H. Connect the ECU couplers, and then fasten the
ECU with the band.
I. Fasten the fuel return hose (fuel return pipe to sub-
fuel tank) with the plastic locking tie. Face the end
of the plastic locking tie inward, and then cut off the
excess end of the tie.
J. Route the cylinder-#1 intake air pressure sensor
lead so that it does not protrude past the top of the
frame.
K. Fasten the fuel tank damper with the plastic locking
tie. Install the plastic locking tie in the middle slot of
the fuel tank damper.
L. Fasten the air filter case damper with the plastic
locking tie so that the rubber part of the damper
contacts the frame. Be sure to pass the plastic
locking tie between the air filter case damper and
the frame.
M. Route the crankshaft position sensor lead,
sidestand switch lead, neutral switch lead, starter
motor lead, and speed sensor lead under the fuel
outlet hose.
N. Inside of frame
O. Outside of frame
P. View with tray removed
Q. Route the negative battery lead under the starter
motor lead and battery positive lead.
R. Route the positive battery lead (main fuse to starter
relay) over the tray.
S. Route the negative battery lead towards the front of
the vehicle.
T. Route the positive battery lead (battery to starter
relay) under the tray.
U. View with tray installed
V. To the tail/brake light
W. View with ECU removed
X. Wrap the protective covering around the couplers
(crankshaft position sensor coupler, auxiliary DC
jack coupler, neutral switch coupler, sub-wire
harness 1 coupler, speed sensor coupler, and
sidestand switch coupler) and the wire harness.
Y. When installing the ECU, be sure not to pinch the
leads in the areas shown in the illustration with
oblique lines.
2-54
Page 81
CABLE ROUTING
1
F
2
3
4
5
6
7
A
17
23
18
19
22
21
H
T
16
G
I
U
20
15
E
13
14
H
J
8
6
S
12
K
B
C
A
D
11
8
9
10
B
M
L
24
V
R
5
G
W
21
X
26
27
F
C
4
Q
P
L
11
O
A
11
N
25
6
5
7
4
7
8
24
C
C-C
B
28
2-55
Page 82
CABLE ROUTING
1. Fuel tank breather hose
2. Fuel sender (fuel tank)
3. Fuel tank
4. Fuel hose (fuel tank to fuel hose joint)
5. Fuel return hose (fuel return pipe to sub-fuel tank)
6. Air vent hose (fuel hose joint to fuel tank)
7. Fuel hose joint
8. Fuel outlet hose
9. Fuel pump
10. Sub-fuel tank
11. Fuel hose (fuel hose joint to fuel pump)
12. Fuel return pipe
13. Fuel return hose (pressure regulator to fuel return
pipe)
14. Pressure regulator
15. Rollover valve 1
16. Rollover valve 2
17. Cylinder-#2 left spark plug lead
18. Rollover valve hose 1
19. Rollover valve hose 2
20. Starter motor lead
21. Fuel tank breather/overflow hose
22. Rollover valve hose 4
23. Rollover valve hose 3
24. Air vent hose (fuel pump to fuel hose joint)
25. Fuel pump coupler
26. Canister purge hose (for California only)
27. Canister (for California only)
28. Canister breather hose (for California only)
A. Align the blue paint mark on the fuel hose (fuel
hose joint to fuel tank) with the round indentation on
the bend in the fuel hose joint.
B. Face the fastener of the clamp downward, making
sure that the projections on the clamp are
positioned as shown in the illustration.
C. Align the white paint mark on the end of the fuel
return hose (fuel return pipe to sub-fuel tank) with
the white paint mark on the fuel return pipe.
D. White paint mark
E. Align the ends of the hose clamp with the white
paint mark on the fuel return hose.
F. Align the paint marks on the hoses with the hose
joint as shown in the illustration.
G. Fasten the fuel tank breather/overflow hose to the
throttle cable guide with the holder.
H. Align the paint mark on the hose with the hose joint
as shown in the illustration.
I. Fasten the fuel tank breather/overflow hose and
starter motor lead with the holder.
J. To the fuel injector
K. Align the yellow paint mark on the air vent hose
(fuel hose joint to fuel tank) with the round
indentation on the bend in the fuel hose joint.
L. Face the fastener of the clamp to the left.
M. Face the ends of the hose clamp forward.
N. Install the air vent hose (fuel pump to fuel hose
joint) with its white paint mark facing upward.
O. Face the ends of the hose clamp upward.
P. Face the fastener of the clamp upward, making
sure that the projections on the clamp are
positioned as shown in the illustration.
Q. Install the fuel hose (fuel tank to fuel hose joint)
with its white paint mark facing downward.
R. To the pressure regulator
S. Install the air vent hose (fuel hose joint to fuel tank)
with its white paint mark facing downward.
T. For California only
U. To the fuel tank
V. To the intake manifold assembly
W. Fasten the canister purge hose and fuel tank
breather/overflow hose with the holder, making sure
to align the paint mark on the breather/overflow
hose with the holder.
X. Fasten the canister purge hose and throttle cable
guide with the holder.
2-56
Page 83
17
CABLE ROUTING
A
5
4
3
B
A
2
1
H
G
16
13
C
6
D
11
F
7
15
8
9
10
E
11
12
13
B
14
18
C-C
I
C
13
11
C
13
11
J
11
B
19
5
7
20
K
22
21
A
4
2-57
Page 84
1. Cylinder-#1 intake air pressure sensor
2. Cylinder-#1 intake air pressure sensor hose
3. Air filter case breather hose 1
4. Fuel hose (intake manifold assembly to pressure
regulator)
5. Pressure regulator
6. Air filter case breather hose 2
7. Canister purge hose (for California only)
8. ISC (idle speed control) unit inlet hose
9. Canister (for California only)
10. Fuel tank breather/overflow hose (for California
only)
11. Cylinder-#2 ISC (idle speed control) unit outlet
hose
12. ISC (idle speed control) unit
13. Cylinder-#1 ISC (idle speed control) unit outlet
hose
14. Cylinder-#2 intake air pressure sensor
15. Cylinder-#1 intake air pressure sensor hose
16. Fuel outlet hose
17. Cylinder head breather hose
18. Hose joint cover
19. Throttle position sensor
20. Cylinder-#1 injector coupler
21. Engine temperature sensor coupler
22. Sub-wire harness 2
A. Face the ends of the hose clamp to the left, angled
45
° rearward.
B. Install the cylinder-#1 intake air pressure sensor
hose onto the throttle body pipe up to the bend in
the pipe, making sure to face the white paint mark
on the hose upward. Face the ends of the hose
clamp forward.
C. Fasten the canister purge hose and the air filter
case breather hose 2 with the hose clamp, making
sure to face the ends of the clamp upward (for
California only).
D. Face the ends of the hose clamp to the left.
E. Fasten the canister purge hose and fuel tank
breather/overflow hose with the holder 70 mm (2.76
in) from the hose joints on the canister (for
California only).
F. Install the cylinder-#2 intake air pressure sensor
hose onto the throttle body pipe up to the bend in
the pipe, making sure to face the white paint mark
on the hose upward. Face the ends of the hose
clamp rearward.
G. Install the canister purge hose onto the throttle
body pipe up to the bend in the pipe, making sure to
face the white paint mark on the hose upward (for
California only).
H. Face the ends of the hose clamp rearward, angled
to the left.
I. Align the white paint marks.
J. Align the yellow paint marks.
K. Route the canister purge hose over the air filter
case joint clamp screw.
CABLE ROUTING
2-58
Page 85
CABLE ROUTING
16
23
1
E
15
14
D
13
12
A
A
4
5
11
9
10
C
B
B
10
9
8
7
6
B
17
9
H
10
I
4
18
19
B
J
8
10
B
8
9
G
A
F
2-59
Page 86
1. Cylinder-#1 intake air pressure sensor
2. Cylinder-#2 intake air pressure sensor hose
3. Cylinder-#2 intake air pressure sensor
4. ISC (idle speed control) unit coupler
5. ISC (idle speed control) unit
6. Rollover valve 1
7. Rollover valve 2
8. ISC (idle speed control) unit inlet hose
9. Cylinder-#1 ISC (idle speed control) unit outlet
hose
10. Cylinder-#2 ISC (idle speed control) unit outlet
hose
11. Hose joint
12. Air filter case breather hose 2
13. Throttle position sensor
14. Throttle body assembly
15. Cylinder-#1 intake air pressure sensor hose
16. Cylinder head breather hose
17. Cylinder-#2 left ignition coil
18. Cylinder-#2 right ignition coil
19. Sub-wire harness 4
A. Face the ends of the hose clamp inward.
B. Face the ends of the hose clamps outward.
C. Install the cylinder-#2 ISC (idle speed control) unit
outlet hose (hose joint to intake manifold assembly)
completely onto the intake manifold, making sure to
face the green paint mark on the hose to the left.
Face the ends of the hose clamp outward, angled
45
° forward.
D. Install the cylinder-#1 ISC (idle speed control) unit
outlet hose (hose joint to intake manifold assembly)
completely onto the intake manifold, making sure to
face the blue paint mark on the hose to the left.
E. Face the ends of the hose clamp upward.
F. Position the sub-wire harness 4 coupler on top of
the guide.
G. To the wire harness
H. Install the cylinder-#1 ISC (idle speed control) unit
outlet hose onto the ISC unit pipe, making sure to
align the blue paint mark on the hose with the blue
paint mark on the pipe.
I. Install the ISC (idle speed control) unit inlet hose
onto the ISC unit pipe, making sure to align the
white paint mark on the hose with the white paint
mark on the pipe.
J. Install the cylinder-#2 ISC (idle speed control) unit
outlet hose onto the ISC unit pipe, making sure to
align the green paint mark on the hose with the
green paint mark on the pipe.
ADJUSTING THE REAR DISC BRAKE.................................................. 3-20
CHECKING THE BRAKE FLUID LEVEL ................................................ 3-20
CHECKING THE FRONT BRAKE PADS................................................ 3-21
CHECKING THE REAR BRAKE PADS .................................................. 3-21
CHECKING THE FRONT BRAKE HOSES............................................. 3-21
CHECKING THE REAR BRAKE HOSES ............................................... 3-22
ADJUSTING THE REAR BRAKE LIGHT SWITCH................................. 3-22
BLEEDING THE HYDRAULIC BRAKE SYSTEM ................................... 3-22
ADJUSTING THE SHIFT PEDAL............................................................ 3-23
ADJUSTING THE DRIVE BELT SLACK................................................. 3-24
CHECKING AND ADJUSTING THE STEERING HEAD......................... 3-25
CHECKING THE FRONT FORK............................................................. 3-26
ADJUSTING THE REAR SHOCK ABSORBER ASSEMBLY.................. 3-27
CHECKING THE TIRES ......................................................................... 3-27
CHECKING THE WHEELS..................................................................... 3-29
CHECKING AND LUBRICATING THE CABLES .................................... 3-29
LUBRICATING THE LEVERS................................................................. 3-30
LUBRICATING THE PEDAL ................................................................... 3-30
LUBRICATING THE SIDESTAND .......................................................... 3-30
LUBRICATING THE REAR SUSPENSION ............................................ 3-30
Page 89
ELECTRICAL SYSTEM ................................................................................ 3-31
CHECKING AND CHARGING THE BATTERY....................................... 3-31
CHECKING THE FUSES ........................................................................ 3-31
REPLACING THE HEADLIGHT BULBS................................................. 3-31
ADJUSTING THE HEADLIGHT BEAMS................................................. 3-32
Page 90
Page 91
PERIODIC MAINTENANCE
EAS20450
PERIODIC MAINTENANCE
EAS20460
INTRODUCTION
This chapter includes all information necessary to perform recommended checks and adjustments. If
followed, these preventive maintenance procedures will ensure more reliable vehicle operation, a longer service life and reduce the need for costly overhaul work. This information applies to vehicles already
in service as well as to new vehicles that are being prepared for sale. All service technicians should be
familiar with this entire chapter.
EAU17600
PERIODIC MAINTENANCE CHART FOR THE EMISSION CONTROL SYSTEM
INITIALODOMETER READINGS
No.ITEMROUTINE
1 * Fuel line
2 * Spark plugs
3 * Valve clearance
Crankcase
4 *
breather system
5 * Fuel injection• Adjust synchronization.√√√√√
6 * Exhaust system
Evaporative emission control sys-
7 *
tem (For
California only)
• Check fuel hoses for cracks or
damage.
• Replace if necessary.
• Check condition.
• Adjust gap and clean.
• Replace every 8000 mi
(13000 km) or 12 months.
• Check and adjust valve clearance when engine is cold.
• Adjust if necessary.
• Check breather hose for
cracks or damage.
• Replace if necessary.
• Check for leakage.
• Tighten if necessary.
• Replace gasket(s) if neces-
sary.
• Check control system for
damage.
• Replace if necessary.
600 mi
(1000 km)
or
1 month
4000 mi
(7000 km)
or
6 months
√√√√√
√Replace.√Replace.√
√√√√√
√√√√√
8000 mi
(13000
km)
or
12 months
Every 16000 mi (25000 km)
* Since these items require special tools, data and technical skills, have a Yamaha dealer perform the
service.
12000 mi
(19000
km)
or
18 months
16000 mi
(25000
km)
or
24 months
√√
20000 mi
(31000
km)
or
30 months
EAU32183
GENERAL MAINTENANCE AND LUBRICATION CHART
INITIALODOMETER READINGS
No.ITEMROUTINE
1 * Air filter element
2 * Clutch
3 * Front brake
4 * Rear brake
5 * Brake hoses
• Check condition and damage.
• Replace if necessary.
• Check operation and fluid
leakage.
• Correct if necessary.
• Check operation, fluid level,
and for fluid leakage.
• Replace brake pads if necessary.
• Check operation, fluid level,
and for fluid leakage.
• Replace brake pads if necessary.
• Check for cracks or damage.√√√√√
• Replace.Every 4 years
600 mi
(1000 km)
or
1 month
√√√√√√
√√√√√√
√√√√√√
4000 mi
(7000 km)
6 months
3-1
8000 mi
(13000
or
√√√√√
km)
or
12 months
12000 mi
(19000
km)
or
18 months
16000 mi
(25000
km)
or
24 months
20000 mi
(31000
km)
or
30 months
Page 92
PERIODIC MAINTENANCE
INITIALODOMETER READINGS
No.ITEMROUTINE
6 * Wheels
7 * Tires
8 * Wheel bearings
Swingarm pivot
9 *
bearings
10 * Drive belt
11 * Steering bearings
12 * Chassis fasteners
Brake and clutch
13
lever pivot shafts
Brake and shift
14
pedal pivot shafts
15Sidestand pivot
16 * Sidestand switch
17 * Front fork
Shock absorber
18 *
assembly
Rear suspension
19 *
link pivots
20Engine oil
Engine oil filter
21 *
cartridge
22 * Transfer case oil
Front and rear
23 *
brake switches
24 * Control cables
Throttle grip
25 *
housing and cable
Lights, signals
26 *
and switches
• Check runout and for damage.
• Replace if necessary.
• Check tread depth and for
damage.
• Replace if necessary.
• Check air pressure.
• Correct if necessary.
• Check bearings for smooth
operation.
• Replace if necessary.
• Check bearing assemblies for
looseness.
• Check belt tension.
• Adjust if necessary.
• Check bearing assemblies for
looseness.
• Moderately repack with lithium-soap-based grease every
16000 mi (25000 km) or 24
months.
km) or 1 month, and thereafter every 16000 mi (25000
km) or 24 months.
• Check operation.√√√√√√
• Apply Yamaha chain and ca-
ble lube or engine oil SAE
10W-30 thoroughly.
• Check operation and free
play.
• Adjust the throttle cable free
play if necessary.
• Lubricate the throttle grip
housing and cable.
• Check operation.
• Adjust headlight beam.
600 mi
(1000 km)
or
1 month
√Every 2500 mi (4000 km)
√√√√Repack.√
√√√√√√
√√√√√√
Change.√Change.
√√√√√√
√√√√√√
4000 mi
(7000 km)
or
6 months
√√√√√
√√√√√
√√√√√
√√√√√
√√√√√
√√√√√
√√√√√
√√√√√
√√√√√
√√√√√
√√√√√
8000 mi
(13000
km)
or
12 months
* Since these items require special tools, data and technical skills, have a Yamaha dealer perform the
service.
12000 mi
(19000
km)
or
18 months
16000 mi
(25000
km)
or
24 months
√
20000 mi
(31000
km)
or
30 months
3-2
Page 93
PERIODIC MAINTENANCE
NOTE:
From 24000 mi (37000 km) or 36 months, repeat the maintenance intervals starting from 8000 mi
(13000 km) or 12 months.
EAU38440
NOTE:
• Air filter
• This model’s air filter is equipped with a disposable oil-coated paper element, which must not be
cleaned with compressed air to avoid damaging it.
• The air filter element needs to be replaced more frequently when riding in unusually wet or dusty
areas.
• Hydraulic brake and clutch systems
• After disassembling the brake or clutch master cylinders, caliper cylinders or clutch release cylinder,
always change the fluid. Regularly check the brake and clutch fluid levels and fill the reservoirs as
required.
• Replace the oil seals on the inner parts of the brake or clutch master cylinders, caliper cylinders and
clutch release cylinder every two years.
• Replace the brake and clutch hoses every four years or if cracked or damaged.
3-3
Page 94
ENGINE
EAS20470
ENGINE
EAS20530
ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
NOTE:
• The valve clearance is automatically adjusted
by the hydraulic valve lifter. However, there are
times when the valve clearance needs to be
adjusted manually. If this is the case, adjust the
clearance of the two maladjusted or worn
valves using the adjusting screw on the rocker
arm.
If clearance is on the slip side “1”, loosen the
adjusting screw and bring the valve clearance
“a” within specification. Check if the valve
clearance “b” on the adjusting screw “2” side is
within specification.
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
• Air filter case
Refer to “GENERAL CHASSIS” on page 4-1.
• Muffler
• Exhaust pipes
Refer to “ENGINE REMOVAL” on page 5-1.
2. Disconnect:
• Spark plug caps
3. Remove:
• Spark plugs
4. Remove:
• Shift pedal assembly “1”
1
If clearance is on the adjusting screw “2” side,
tighten the adjusting screw and bring the valve
clearance “b” within specification.
• Valve clearance adjustment should be made
on a cold engine, at room temperature.
• When the valve clearance is to be measured or
adjusted, the piston must be at top dead center
(TDC) on the compression stroke.
5. Remove:
• Damper cover “1”
• Damper “2”
• Timing mark accessing screw “3”
• Crankshaft end screw “4”
4
2
3
1
6. Remove:
• Camshaft sprocket cover “1”
1
1. Remove:
• Rider seat
• Rider seat bracket assembly
Refer to “GENERAL CHASSIS” on page 4-1.
7. Remove:
• Wire harness guide bolt “1”
3-4
Page 95
ENGINE
8. Remove:
• Fuel tank damper “1”
• Cylinder head breather hose “2”
9. Disconnect:
• Oil tank breather hose “3”
• Fuel outlet hose “4”
1
4
2
1
3
2
3
11.Measure:
• Valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake
0.00–0.04 mm (0.0000–0.0016 in)
Exhaust
0.00–0.04 mm (0.0000–0.0016 in)
3
▼▼▼▼▼ ▼▼▼▼▼▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼▼▼
Piston #1 TDC (rear cylinder)
a. Turn the crankshaft counterclockwise.
10.Remove:
• Front cylinder head cover “1”
• Rear cylinder head cover “2”
NOTE:
Due to the small clearance between the frame
and the rear cylinder head cover, the three bolts
“3” cannot be removed when the cover is in
place. Loosen the bolts, and then remove the
cylinder head cover from the right side of the vehicle, making sure that the bolts do not scratch
the rocker arms or other engine parts.
1
2
b. When piston #1 is at TDC on the compres-
sion stroke, align the TDC mark “a” on the
crankshaft position sensor rotor with the
pointer “b” on the clutch cover.
b
a
c. Check the camshaft drive gear mark “c” posi-
tion and camshaft driven gear mark “d” position as shown.
If the marks are not aligned, turn the crankshaft counterclockwise 360 degrees and recheck step (b).
3-5
Page 96
d
c
d. Measure the valve clearance with a thickness
gauge.
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
▲▲▲▲▲ ▲▲▲▲▲▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲▲▲
▼▼▼▼▼ ▼▼▼▼▼▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼▼▼
Piston #2 TDC (front cylinder)
a. Turn the crankshaft counterclockwise from
the piston #1 TDC by 408 degrees.
b. When piston #2 is at TDC on the compres-
sion stroke, align the TDC mark “e” on the
crankshaft position sensor rotor with the
pointer “b” on the clutch cover.
ENGINE
Thickness gauge
90890-03180
▲▲▲▲▲ ▲▲▲▲▲▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲▲▲
12.Adjust:
• Valve clearance
▼▼▼▼▼ ▼▼▼▼▼▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼▼▼
a. Loosen the locknut “1”.
b. Insert a thickness gauge “2” between the end
of the adjusting screw and the valve tip.
Feeler gauge set
YU-26900-9
1
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
b
e
c. Check the camshaft drive gear mark “c” posi-
tion and camshaft driven gear mark “d” position as shown.
d
c
d. Measure the valve clearance with a thickness
gauge.
c. Turn the adjusting screw “3” in direction “a” or
“b” with the tappet adjusting tool “4” until the
specified valve clearance is obtained.
Tappet adjusting tool (4 mm)
90890-04133
Valve adjustment wrench 3 mm &
4 mm
YM-08035-A
Direction “a”
Direction “b”
Adjusting
screw side
Valve clearance is increased.
Valve clearance is decreased.
Slip side
Valve clearance is decreased.
Valve clearance is increased.
3-6
Page 97
ENGINE
• Cylinder-#1 ignition coil cover
Refer to “ENGINE REMOVAL” on page 5-1.
3
4
2
b
a
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
3. Remove:
• Cylinder-#1 intake air pressure sensor bracket “1”
• Cylinder-#2 intake air pressure sensor bracket “2”
d. Hold the adjusting screw to prevent it from
moving and tighten the locknut to specification.
Locknut (rocker arm adjusting
T
.
screw)
R
20 Nm (2.0 m·kg, 14 ft·lb)
Tappet adjusting tool (4 mm)
90890-04133
Valve adjustment wrench 3 mm &
4 mm
YM-08035-A
e. Measure the valve clearance again.
f. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjustment steps until the specified clearance is
obtained.
▲▲▲▲▲ ▲▲▲▲▲▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲▲▲
13.Install:
• All removed parts
Refer to “CAMSHAFTS” on page 5-14.
NOTE:
For installation, reverse the removal procedure.
EAS20570
SYNCHRONIZING THE THROTTLE BODIES
NOTE:
Prior to synchronizing the throttle bodies, the
valve clearance and the engine idling speed
should be properly adjusted and the ignition timing should be checked.
1. Stand the vehicle on a level surface.
NOTE:
Place the vehicle on a suitable stand.
2. Remove:
• Rider seat
• Rider seat bracket assemblyRefer to “GENERAL CHASSIS” on page 4-1.
2
1
4. Disconnect:
• Cylinder-#1 intake air pressure sensor hose
“1”
• Cylinder-#2 intake air pressure sensor hose
“2”
2
1
5. Install:
• Hose “1” (Parts No.: 5JW-24311-00)
• 3-way joint “2” (Parts No.: 90413-05014)
• Vacuum gauge hose for #1 “3”
• Vacuum gauge hose for #2 “4”
• Cylinder-#1 intake air pressure sensor hose
“5”
• Cylinder-#2 intake air pressure sensor hose
“6”
• Vacuum gauge
• Tachometer
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
3-7
Page 98
4
6
2
1
1
5
3
2
6. Install:
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
7. Adjust:
• Throttle body synchronization
▼▼▼▼▼ ▼▼▼▼▼▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼▼▼
a. Start the engine and let it warm up for several
minutes, and then let it run at specified engine idling speed.
Engine idling speed
850–950 r/min
b. With throttle body #1 as standard, adjust
throttle body #2 using the air screw “1” (for
throttle body #2).
1
ENGINE
NOTE:
The difference in vacuum pressure between two
throttle bodies should not exceed 1.33 kPa (10
mmHg).
▲▲▲▲▲ ▲▲▲▲▲▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲▲▲
8. Stop the engine and remove the measuring
equipment.
9. Adjust:
• Throttle cable free play
Refer to “ADJUSTING THE THROTTLE CABLE FREE PLAY” on page 3-8.
Throttle cable free play
4.0–6.0 mm (0.16–0.24 in)
10.Install:
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
• Cylinder-#1 ignition coil cover
Refer to “ENGINE REMOVAL” on page 5-1.
• Rider seat bracket assembly
• Rider seat
Refer to “GENERAL CHASSIS” on page 4-1.
EAS20630
ADJUSTING THE THROTTLE CABLE FREE
PLAY
NOTE:
Prior to adjusting the throttle cable free play, the
engine idling speed and throttle body synchronization should be adjusted properly.
NOTE:
• After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
• If the air screw was removed, turn the screw
3/4 turn in and be sure to synchronize the throttle body.
ECA14900
CAUTION:
Do not use the throttle valve adjusting
screws to adjust the throttle body synchronization.
Intake vacuum
31.3–35.3 kPa (9.3–10.4 inHg)
(235–265 mmHg)
1. Check:
• Throttle cable free play “a”
Out of specification → Adjust.
a
Throttle cable free play
4.0–6.0 mm (0.16–0.24 in)
2. Adjust:
• Throttle cable free play
3-8
Page 99
ENGINE
▼▼▼▼▼ ▼▼▼▼▼▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼▼▼
a. Loosen the locknut “1”.
b. Turn the adjusting nut “2” in direction “a” or “b”
until the specified throttle cable free play is
obtained.
Direction “a”
Throttle cable free play is increased.
Direction “b”
Throttle cable free play is decreased.
c. Tighten the locknut “1”.
2
a
b
1
EWA12910
WARNING
After adjusting the throttle cable free play,
start the engine and turn the handlebar to the
right and to the left to ensure that this does
not cause the engine idling speed to change.
4. Check:
• Spark plug type
Incorrect → Change.
Manufacturer/model
NGK/DPR8EA-9
Manufacturer/model
DENSO/X24EPR-U9
5. Check:
• Electrode “1”
Damage/wear → Replace the spark plug.
• Insulator “2”
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
7. Measure:
• Spark plug gap “a”
(with a wire thickness gauge)
Out of specification → Regap.
Spark plug gap
0.8–0.9 mm (0.031–0.035 in)
▲▲▲▲▲ ▲▲▲▲▲▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲▲▲
EAS20680
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
1. Remove:
• Rider seat
• Rider seat bracket assemblyRefer to “GENERAL CHASSIS” on page 4-1.
• Fuel tankRefer to “FUEL TANK” on page 6-1.
• Air filter case
Refer to “GENERAL CHASSIS” on page 4-1.
2. Disconnect:
• Spark plug cap
3. Remove:
• Spark plug
ECA13320
CAUTION:
Before removing the spark plugs, blow away
any dirt accumulated in the spark plug wells
with compressed air to prevent it from falling
into the cylinders.
8. Install:
• Spark plug
Spark plug
T
.
NOTE:
R
18 Nm (1.8 m·kg, 13 ft·lb)
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Connect:
• Spark plug cap
3-9
Page 100
10.Install:
• Air filter case
Refer to “GENERAL CHASSIS” on page 4-1.
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
• Rider seat bracket assembly
• Rider seat
Refer to “GENERAL CHASSIS” on page 4-1.
EAS20700
CHECKING THE IGNITION TIMING
NOTE:
Prior to checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure all connections are tight and free of
corrosion.
ENGINE
1
5. Check:
• Ignition timing
▼▼▼▼▼ ▼▼▼▼▼▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼▼▼▼▼
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified engine idling speed.
1. Stand the vehicle on a level surface.
2. Remove:
• Shift pedal assembly “1”
1
3. Remove:
• Damper cover “1”
• Damper “2”
• Timing mark accessing screw “3”
2
3
1
Engine idling speed
850–950 r/min
b. Check that pointer “a” on the clutch cover is
within the firing range “b” on the crankshaft
position sensor rotor.
Incorrect firing range → Check the ignition
system.
a
NOTE:
b
The ignition timing is not adjustable.
▲▲▲▲▲ ▲▲▲▲▲▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲▲▲▲▲
6. Install:
• Timing mark accessing screw
• Damper
• Damper cover
4. Connect:
• Timing light “1”
• Tachometer
Timing light
90890-03141
Inductive clamp timing light
YU-03141
3-10
Damper cover bolt
T
.
R
10 Nm (1.0 m·kg, 7.2 ft·lb)
7. Install:
• Shift pedal assembly “1”
Shift pedal bolt
T
.
R
18 Nm (1.8 m·kg, 13 ft·lb)
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