Yamaha XT550J Manuale utente

_YAMAHA

LIT-11616-03-00 5Y1-28197-10

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NOTICE

This manual was written by the Yamaha

Motor

Company primarily

for

use

by Yamaha dealers

and their qualified mechanics. It

not

possible to put

entire mechanic's education into one

manual,

assumed

that

persons using this book

perform maintenance and repairs on

Yamaha motorcycles have a basic understanding

the mechanical concepts and procedures in-

herent

motorcycle repair technology.

Without

such knowledge, attempted repairs or service

this model may render it

unfit

use

and/

or unsafe.

This model

has

been designed and manufactured

perform within certain specifications

regard

performance and emissions. Proper service with the correct tools

necessary to en-

sure that the motorcycle will operate

designed. If there is any question about a service pro-

cedure, it

imperative

that

you contact a Yamaha dealer for any service information changes

that

apply

this model. This policy

intended

provide the customer with the most satisfac-

tion from his motorcycle and

conform with federal environmental qualityobjectives.

Yamaha Motor Company, Ltd.

continually striving

improve

all

models manufactured by

Yamaha. Modifications and significant changes

specifications

procedures will

forwarded

all

Authorized Yamaha dealers and will, where applicable, appear

future editions

this

manual.

NOTE:

______________________________________________________

This Service Manual contains information regarding periodic maintenance

the emission con-

trol system

for

the XT550J. Please read this material carefully.

Particularly important information is distinguished in this manual bythe following notations:

NOTE: A NOTE provides key information

make procedures easier

clearer.

CAU11ON:

A CAUTION indicates special procedures

that

must

followed

avoid damage

the motorcycle.

WARNING:

WARNING

indicates special procedures

that

must

followed to avoid injury

a motorcycle operatoror person inspecting or repairing the motorcycle.

SERVICE DEPT.

INTERNATIONAL

DIVISION

YAMAHA

MOTOR

CO., LTD.

GENERAL INFORMATION

PERIODIC INSPECTIONS

AND

ADJUSTMENTS

ENGINE

OVERHAUL

CARBURETION

CHASSIS

ELECTRICAL

APPENDICES

CHAPTER·'. GENERAL INFORMATION

MOTORCYCLE IDENTIFiCATION

........

........................

1-1

A. Frame Serial Number

....

.............

..................

1-1

Engine Serial Number

..........................

...

.......

.....

1-1

Vehicle Identification Number .

.....

....................

......

1-1

MAIN

FEATURES.

.............................................

1-2

A. Dry Sump System and Monocross Suspension

...............

.....

1-2

Four-Valve Engine

...........................................

1-3

Yamaha Duo Intake System (YDIS)

...............

..............

1-4

Kick Synchronous Automatic Decompression

......................

1-5

Lighting System

.........................................

1-6

F. Detachable Lighting System

....

...

................

.........

1-7

Fuel

Tank

Cap

with

Check Valve

................................

1-8

SPECIAL TOOLS.

..............................................

1-9

For

Tune-up

..........

...

............

..................

1-9

For

Engine Service

............

..............................

1-9

For

Chassis Service

.........

..............................

1-12

For

Electrical Components

.....

..............................

1-12

GENERAL

INFORMATION

MOTORCYCLE

IDENTIFICATION

A. Frame Serial

Number

The frame serial number

stamped into the

right side

the steering head pipe.

Frame

Serial Number

Starting Serial Number:

XT550J

..............

.....

5Y1-000101

Engine Serial Number

The engine serial number is stamped into the

elevated part

the right section

the

engine.

NOTE:

______________________

The first three digits

these numbers

are

for

model identification; the remaining digits

are

the unit production number.

1-1

Vehicle Identification Number

The vehicle identification number

on the

left side

the steering head pipe.

1. Vehicle Identification Number

MAIN

FEATURES

Dry

Sump

System

and

Monocross

Suspension

The XT550J, which inherits the traditional XT500

dry sump system, features monoshock suspen-

sion, light weight, and a

new

diamond-shaped

frame

with

integrated oil tank.

1-2

Four-Valve

Engine

Newly designed compact engine equipped

with:

S.O.H.C., 4-Valve head, Dual intake and dual ex-

haust ports,gear-driven balancer,Yamaha Duo In-

take System (YDIS), and 5-speed transmission

1-3

Yamaha

Duo

Intake

System

(YOIS)

For this system, the primary carburetor and the secondary carburetor

are

equipped

a unit:

A cable-operated-slide type functions

the primary carb, and a vaccum-controlled-slide type

provides asecondary bore. The engine has a4-valve head, and each carb

has

its own intake port

and valve. Although each carb bore and intake port

smaller than that

a more conventional

engine, their conbined

area

about 20% greater than a single, larger carb and intake layout.

Flow efficiency

both the intake and exhaust sides

substantially improved.

From

idle to about

half

throttle, the primary carb supplies the air-fuel mixture, and almost the entire intake charge

enters through just one valve; since the 4-valve layout offsets the intake ports relative

the

cylinder-bore axis, a strong YICS-type swirl

produced

the

low-to-medium rpm range.

Combustion efficiency

significantly enhanced, resulting

improved fuel economy.

addi-

tion,

the single small bore provides excellent low- and medium-speed throttle response due

the

high air velocity in the venturi. This eliminates the need for a mechanical accelerator pump,

allowing minimal carb height and ample room for the Monocross rear suspension. As the throttle

is turned from half to wide open, a linkage between the carburetors gradually opens the

secondary-carb butterfly. The vaccum-controlled slide

the secondary carb opens

engine

demand builds, providing superb mid-range smoothness. With both slides fully open, the engine

receives more mixture and produces more powerthan a regular single-carb machine.

SECONDARY

CARB

PRIMARY

CARB

1-4

Top view

EXHAUST

INTAKE

D. Kick Synchronous

Automatic

Decompression

The kick-starting mechanism is interlinked

with

one

the

exhaust valves, thus automatically

decompressing the

combustion

chamber

for

ease in kick-starting. Combined

with

electronic ad-

vance ignition, kick-starting is free

from

possible kickback. Correct adjustment is required

this

kick-synchronous

automatic

decompression system

for

effective performance.

1-5

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