Yamaha XV19SW(C), XV19W(C), XV19MW(C), XV19CTSW(C), XV19CTW(C), XV19CTMW(C). Service Manual - part 1

EAS20070

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 man-
ual. 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 vehi-
cle 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 vehi-
cle 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 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.

NOTE:

• This Service Manual contains information regarding periodic maintenance to the emission control sys-

tem. Please read this material carefully.

• Designs and specifications are subject to change without notice.

EAS20080

IMPORTANT MANUAL INFORMATION

Particularly important information is distinguished in this manual by the following.

The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR 
SAFETY IS INVOLVED!

Failure to follow WARNING instructions could result in severe injury or death 
to the vehicle operator, a bystander or a person checking or repairing the ve-
hicle.

A CAUTION indicates special precautions that must be taken to avoid dam-
age to the vehicle.

A NOTE provides key information to make procedures easier or clearer.

WARNING

CAUTION:

NOTE:

EAS20090

HOW TO USE THIS MANUAL

This manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensive 
explanations of all installation, removal, disassembly, assembly, repair and check procedures are laid 
out with the individual steps in sequential order.
• The manual is divided into chapters and each chapter is divided into sections. The current section title 

is shown at the top of each page “1”.

• Sub-section titles “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 disas-

sembly 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 sequen-

tially.

EAS20100

SYMBOLS

The following symbols are used in this manual 
for easier understanding.

NOTE:

The following symbols are not relevant to every 
vehicle.

G

M

E

B

LS

M

9

10

11

12

13

14

15

16

LT

New

T

 

R

.

1

2

3

4

5

6

7

8

1. Serviceable with engine mounted
2. Filling fluid
3. Lubricant
4. Special tool
5. Tightening torque
6. Wear limit, clearance
7. Engine speed
8. Electrical data
9. Engine oil
10. Gear oil
11. Molybdenum-disulfide oil
12. Wheel-bearing grease
13. Lithium-soap-based grease
14. Molybdenum-disulfide grease

15. Apply locking agent (LOCTITE

®

)

16. Replace the part

EAS20110

TABLE OF CONTENTS

GENERAL INFORMATION

1

SPECIFICATIONS

2

PERIODIC CHECKS AND ADJUSTMENTS

3

CHASSIS

4

ENGINE

5

FUEL SYSTEM

6

ELECTRICAL SYSTEM

7

TROUBLESHOOTING

8

1

GENERAL INFORMATION

IDENTIFICATION

............................................................................................ 1-1

VEHICLE IDENTIFICATION NUMBER..................................................... 1-1
MODEL LABEL ......................................................................................... 1-1

FEATURES

..................................................................................................... 1-2

OUTLINE OF THE FI SYSTEM................................................................. 1-2
FI SYSTEM ............................................................................................... 1-3
INSTRUMENT FUNCTIONS..................................................................... 1-4

IMPORTANT INFORMATION

......................................................................... 1-8

PREPARATION FOR REMOVAL AND DISASSEMBLY .......................... 1-8
REPLACEMENT PARTS .......................................................................... 1-8
GASKETS, OIL SEALS AND O-RINGS .................................................... 1-8
LOCK WASHERS/PLATES AND COTTER PINS..................................... 1-8
BEARINGS AND OIL SEALS.................................................................... 1-9
CIRCLIPS.................................................................................................. 1-9

CHECKING THE CONNECTIONS

................................................................ 1-10

SPECIAL TOOLS

.......................................................................................... 1-11

IDENTIFICATION

1-1

EAS20130

IDENTIFICATION

EAS20140

VEHICLE IDENTIFICATION NUMBER

The vehicle identification number “1” is stamped 
into the right side of the steering head pipe.

EAS20150

MODEL LABEL

The model label “1” is affixed to the frame under 
the rider seat. This information will be needed to 
order spare parts.

1

1

FEATURES

1-2

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 con-
ditions, such as acceleration, deceleration, or operating under a heavy load. Carburetors that meter the 
fuel through the use of jets have been provided with various auxiliary devices, so that an optimum air-
fuel ratio can be achieved to accommodate the constant changes in the operating conditions of the en-
gine.
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 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.

1

2

20

21

3

4 5 6 7 8

9 10

11

12

14

13

16

19

18

17 16 15

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

2

 sensor

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

FEATURES

1-3

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. There-
fore, the longer the length of time the fuel injector is energized (injection duration), the greater the vol-
ume 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

2

 sensor enable the ECU to determine the injection 

duration. The injection timing is determined through the signals from the crankshaft position sensor. As 
a result, the volume of fuel that is required by the engine can be supplied at all times in accordance with 
the driving conditions.

Illustration is for reference only.

15

A

1

2

3

4

C

5

8

7

6

10

11

12

13

14

B

#1

#2

9

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

2

 sensor

10. Catalytic converter
11. Engine temperature sensor
12. Crankshaft position sensor

13. Intake air pressure sensor
14. Throttle body
15. Air filter case

A. Fuel system
B. Air system
C. Control system

FEATURES

1-4

ET1D71036

INSTRUMENT FUNCTIONS

Multi-function meter unit

WARNING

EW1D71008

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 trav-

eled since they were last set to zero)

• a fuel reserve tripmeter (which shows the dis-

tance 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 kilo-
meters and miles, press the “SELECT” switch 
for at least two seconds. (For USA and Califor-
nia only)

Speedometer

The speedometer shows the riding speed.
When the key is turned to “ON”, the speedome-
ter needle will sweep once across the speed 
range and then return to zero in order to test the 
electrical circuit.

1. Speedometer
2. Fuel gauge
3. Odometer/tripmeter/fuel reserve 

tripmeter/clock

4. Tachometer

2

3

1

4

1. “SELECT” switch
2. “RESET” switch

1. Speedometer

1

FEATURES

1-5

Tachometer

The electric tachometer allows the rider to mon-
itor 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.

CAUTION:

EC1D71017

Do not operate the engine in the tachometer 
red zone.
Red zone: 5000 r/min and above

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 com-

pletely.

• The fuel gauge does not indicate the correct 

fuel level for the first 5 km/h (3 mi/h) after refu-
eling.

Odometer, tripmeter, and clock modes

Push the “SELECT” switch to switch the display 
between the odometer mode “ODO”, the tripme-
ter 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 tripme-
ter, 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. Tachometer
2. Tachometer red zone

1. Fuel gauge

2

1

1

1. Odometer/tripmeter/fuel reserve 

tripmeter/clock

1. Clock

1

FEATURES

1-6

To set the clock:
1. Push the “SELECT” switch to change the dis-

play 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 de-
vice 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 INJEC-
TION SYSTEM” on page 7-27.

CAUTION:

EC1D71018

If the display indicates an error code, the ve-
hicle should be checked as soon as possible 
in order to avoid engine damage.

Brightness control mode

The brightness can be adjusted for the following:
• the multi-function meter unit panel (item num-

ber “1”)

• the LCD (item number “2”)
• the speedometer, tachometer, and the fuel 

gauge needles (item number “3”)

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.

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.

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 speedome-
ter, tachometer, and the fuel gauge needles 
by pushing the “RESET” switch.

1. Multi-function meter unit panel
2. LCD
3. Speedometer needle
4. Tachometer needle
5. Fuel gauge needle

2

3

4

5

1

1. Multi-function meter unit panel
2. Item number
3. Brightness level

1. LCD
2. Item number
3. Brightness level

2

3

1

2

3

1

FEATURES

1-7

7. Push the “SELECT” switch.

The odometer/tripmeter/clock display will re-
turn to the prior mode.

1. Speedometer needle
2. Tachometer needle
3. Fuel gauge needle
4. Item number
5. Brightness level

4

2
3

1

5

IMPORTANT INFORMATION

1-8

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 equip-

ment.
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 assem-
bly.

4. During disassembly, clean all of the parts and 

place them in trays in the order of disassem-
bly. This will speed up assembly and allow for 
the correct installation of all parts.

5. Keep all parts away from any source of fire.

EAS20200

REPLACEMENT PARTS

Use only genuine Yamaha parts for all replace-
ments. Use oil and grease recommended by 
Yamaha for all lubrication jobs. Other brands 
may be similar in function and appearance, but 
inferior in quality.

EAS20210

GASKETS, OIL SEALS AND O-RINGS

1. When overhauling the engine, replace all 

gaskets, seals and O-rings. All gasket surfac-
es, oil seal lips and O-rings must be cleaned.

2. During reassembly, properly oil all mating 

parts and bearings and lubricate the oil seal 
lips with grease.

EAS20220

LOCK WASHERS/PLATES AND COTTER 
PINS

After removal, replace all lock washers/plates 
“1” and cotter pins. After the bolt or nut has been 
tightened to specification, bend the lock tabs 
along a flat of the bolt or nut.

1. Oil
2. Lip
3. Spring
4. Grease

IMPORTANT INFORMATION

1-9

EAS20230

BEARINGS AND OIL SEALS

Install bearings and oil seals so that the manu-
facturer’s marks or numbers are visible. When 
installing oil seals “1”, lubricate the oil seal lips 
with a light coat of lithium-soap-based grease. 
Oil bearings liberally when installing, if appropri-
ate.

CAUTION:

ECA13300

Do not spin the bearing with compressed air 
because this will damage the bearing surfac-
es.

EAS20240

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 “2” is positioned opposite 
the thrust “3” that the circlip receives.