Yamaha V STAR 950 Bedienungsanleitung

Fix it like a Pro

www.repairpromanuals.com

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 “1” is shown at the top of each page.

• 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 dis-

assembly 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.

EAS20100

SYMBOLS

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

TIP

The following symbols are not relevant to every vehicle.

SYMBOL DEFINITION SYMBOL DEFINITION

Serviceable with engine

mounted Gear oil

Filling fluid Molybdenum disulfide oil

Lubricant Brake fluid

Special tool Wheel bearing grease

Tightening torque Lithium-soap-based grease

Wear limit, clearance Molybdenum disulfide grease

Engine speed Silicone grease

Electrical data Apply locking agent (LOC-

TITE®).

Engine oil Replace the part with a new

one.

EAS20110 TABLE OF CONTENTS

GENERAL INFORMATION

SPECIFICATIONS

PERIODIC CHECKS AND ADJUSTMENTS

CHASSIS

ENGINE

FUEL SYSTEM

ELECTRICAL SYSTEM

TROUBLESHOOTING

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 .......................................................................1-6

PREPARATION FOR REMOVAL AND DISASSEMBLY..........................1-6

REPLACEMENT PARTS.........................................................................1-6

GASKETS, OIL SEALS AND O-RINGS..................................................1-6

LOCK WASHERS/PLATES AND COTTER PINS ...................................1-6

BEARINGS AND OIL SEALS .................................................................1-7

CIRCLIPS ...............................................................................................1-7

CHECKING THE CONNECTIONS ...............................................................1-8

SPECIAL TOOLS..........................................................................................1-9

IDENTIFICATION

1-1

EAS20130

IDENTIFICATION

EAS20140

VEHICLE IDENTIFICATION NUMBER

The vehicle identification number “1” is

stamped into the right side of the steering

head pipe.

EAS20150

MODEL LABEL

The model label “1” is affixed to the frame. This

information will be needed to order spare

parts.

FEATURES

1-2

EAS20170

FEATURES

EAS5S71022

OUTLINE OF THE FI SYSTEM

The main function of a fuel supply system is to provide fuel to the combustion chamber at the opti-

mum air-fuel ratio in accordance with the engine operating conditions and the atmospheric tempera-

ture. In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied to the

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 air-fuel ratio can be achieved to accommodate the constant changes in the operating con-

ditions of the engine.

As the requirements for the engine to deliver more performance and cleaner exhaust gases

increase, it becomes necessary to control the air-fuel ratio in a more precise and finely tuned man-

ner. To accommodate this need, this model has adopted an electronically controlled fuel injection

(FI) system, in place of the conventional carburetor system. This system can achieve an optimum

air-fuel ratio required by the engine at all times by using a microprocessor that regulates the fuel

injection volume according to the engine operating conditions detected by various sensors.

The adoption of the FI system has resulted in a highly precise fuel supply, improved engine

response, better fuel economy, and reduced exhaust emissions.

1. Air temperature sensor

2. Intake air pressure sensor

3. Engine trouble warning light

4. Fuel pump

5. Front cylinder injector

6. Rear cylinder injector

7. Throttle position sensor

8. Spark plug

9. Speed sensor

10.Relay unit (fuel pump relay)

11.ECU (engine control unit)

12.O2sensor

13.Lean angle sensor

14.ISC (idle speed control) unit

15.Crankshaft position sensor

16.Rear cylinder ignition coil

17.Front cylinder ignition coil

18.Engine temperature sensor

FEATURES

1-3

EAS5S71020

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, 56.9 psi). Accordingly,

when the energizing signal from the ECU energizes the fuel injector, the fuel passage opens, caus-

ing 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 ener-

gized (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, lean angle sensor, speed sensor and O2sensor enable the

ECU to determine the injection duration. The injection timing is determined through the signals from

the crankshaft position sensor. As a result, the volume of fuel that is required by the engine can be

supplied at all times in accordance with the driving conditions.

Illustration is for reference only.

Front

Rear

1. Fuel pump

2. Fuel injector

3. Ignition coil

4. ECU (engine control unit)

5. Air temperature sensor

6. Lean angle sensor

7. ISC (idle speed control) unit

8. Throttle position sensor

9. O2sensor

10.Engine temperature sensor

11.Catalytic converter

12.Crankshaft position sensor

13.Intake air pressure sensor

14.Throttle body

15.Air filter case

16.Speed sensor

A. Fuel system

B. Air system

C. Control system

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