NOTICE
This manual has been
written
M
oto
r Company
for
use
by
by Yamaha
Auth
orized
qualified Yamaha Dealers and their
mechani
cs
. In
light
of
this purpose
it
h
as
been assumed
that
certain basi
c;
mechanical
precepts and procedures inherent
to
our
pro
-
duct
are already
kn
o
wn
and understood
by
the reader. This service manual has been
written
to
acquaint
the
mechanic
with
com
-
mon
disassembly. inspection. reassembly.
maintenance. and
troub
leshooting
pro
-
cedures associated
with
this
machine.
The Research. Engineering. and Service De-
partment
of
Yamaha are continually striving
to
further improve all models manufactured
by
the
company.
Modifi
ca
tions
are therefore
inevitable and
significant
changes in specifi-
cations
or
procedures
will
be forwarded-
to
all Au
thor
ized Yamaha Dealers and
will
.
wh
ere applicable. appe
ar
in
future edi
tions
of
this manual.
Particularly
important
information
is dis-
tingui
shed
in
this manual
by
the
following
notations:
NOTE
:
A NO
TE
provides key
info
r
mat
io
n
to
make
_Procedures easier
or
clearer.
CAUTION
:
A CAUTION indicates special procedures
th
at
must
be
followed
to
avoid damage
to
the machine.
WARNING
:
A
WARNING
indi
ca
tes
special pro
ce
dures
that
mu
st
be
followed
to avoid
injury
to
a
machine oper
ator
or
person inspecting
or
re-
pairing the machine.
QT
50/
MA50
SERVI
CE
MANUAL
FIRST
EDITION
,
SEPTEMBER
1979
All
RIGHTS
RESERVED
BY
YAMAHA
MOTOR
CO.,
lTD
.
JAPAN
PRINTED
IN
JAPAN
A VERTISSEMENT
Ce manuel a etc ccrit
pa
r la Yamaha Motor
Company
a !'intension
de
s Conce
ss
ionnaires
Yamaha
Aut
orises et
de
leurs mecanic
ie
ns
qualifi
es.
Ceci etant, ii a ete
su
ppo
se
quc ccr
-·
tains princip
es
mecani
ques
de b
ase
et
cer
tains
procedur
es
inhere
nt
s a notre produit
son
t deja
connus et compris par le l
ecte
ur. Ce manual
d'entre
ti
en
a
ete
ecrit pour familiari
ser
le
me
-
ca
nicien avec
Jes
pr
oce
dures courantes
de
demontage,
d'
in
spec
tion,
de
remonta
ge,
d'cntretien, et
de
depannage concernant
ce
tt
e
ma
ch
in
e.
L
es
Departme
nt
s
de
Re
cherche,
d'Engineering et
d'E
nt
reti
en
de
chez
Yamaha
s'e
fTorccnt en permanence
de
pe
rfectionner
dava
nt
age
tous
le
s modcles fabriqu
es
par la
compagni
e.
D
es
modifications
son
t done
in
-
ev
ita
bl
es
et l
es
chan
ge
m
ents
signifi
ca
t
if
s d
ans
l
es
caracteristiques ou lcs procedu
re
s
se
r
on
t
cnvoyes
a tous
le
s Con
cessio
nnaires Yam
aha
auto
ri
ses
et. applicables
de
sui
te
, apparaitront
dans
les
ed
iti
ons de
ce
manuel.
Dans
cc
manuel, l
es
informations particuliere-
ment importantes
so
nt distin
guees
par
les
nota-
tions suivantes:
N
.B
.:
Un
N.B. fournit le r
enseigne
ment n
ecessaire
pour rendre
les
procedures plus faci
les
ou plus
cha
ir
es.
A
TTEN
TIO
N:
Un
A
ITENTION
indique
les
procedures s
pe
-
ci
ales
qui doiv
ent
et
re
su
i
vies
pour eviter
d'endommager
la
machi
ne.
A
VE
RTISSEM
ENT:
Un
AVERT
ISSEM
ENT
indiquc
le
s procedures
sp
ec
iales qui doivent
et
re suivi
es
p
our
ev
it
er un
accident
a l
'ut
ili
sa
tcur de la machine OU a la
per
so
nne qui l'
in
specte OU la repare.
QTSO/ MASO
MAN
UE
L D
'E
NTR
E
TI
EN
PR
EMIERE
EDI
T
ION
,
SE
P
TE
MBRE 1979
TO
US
DROJT
S RESERVES PAR LA
YA
MAH
A MO
TOR
CO., L
TD
.
JAP
ON
IMPRIM
E AU J
AP
ON
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