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A.
Description
1.
Yamaha has designed a unique stainless steel
reed valve located between the carburetor and
cy-
linder.
The valve works
independently
on a
demand basis.
There's
no mechanical device.
such as a rotary valve or
piston skirt
to goyern
its
opening and
closing.
2.
Construction of
reed
valve assembly.
a.
Valve
The valve
is
made of special fl exible stainless
steel and
designed
to
open
and close the inlet
port.
Check the valve. and if cracked or broken, replace.
Check the reed valve bending.
Bending limit:
0.012 in.
(0.3
mm.}
or
less
b. Case
The case
is made of a die-cast aluminum alloy.
c. Gasket
Made of heat and oil-resisting
rubber,
the gasket
is
"
welded" to the case by heat.
d. Valve stopper
112
The valve stopper
is
made of highly-durable
cold-rolled stainless steel plate. and controls the
movement of the valve.
(Fig.
4-3-2)
Fig. 4 -3-2
A.
Description
I.
Yamaha a
mis a
u
point
une soupape
unique
a
lame
en acier
inoxydable situee
entre le
carburateur
et le
cylindre.
La soupape fonctionne
independamment.
II n'y a pas
de
dispositif
mecanique,
tel
qu'une
sou-
pape
rotative ou
un
piston
it
jupe
pour commander
son
ouverture
ou sa
fermeture.
2. Construction
de !'assemblage
de
soupape
a
lame
a.
Soupape
La
soupape
est en acier special inoxydable
et
flexible
et destinee
a
ouvrir
et
a
fermer la lumiere
d'admis-
sion
..
Verifier la
soupape,
et si clle est craquclee ou
cassee,
la
remplacer.
Verifier
la
courbure
de la soupape
a
lame.
Limite de
courbure:
0,3 mm o
u mains.
b. Boitier
Le
boitier
est
en alliage
d'aluminium moule.
c. Joint
plat
II
est
en
caoutcho uc
calorifuge
et
resistant
a
l'huile, ii
se soude
a
u
boiticr
par action
thermique.
d.
Butoir de
soupape
Le
butoir
de
soupape est en
tole d'acier inoxydable
laminec
a
froid et
hautement durable, ii controle
le
mouvement
de
la
soupape. (Fig.
4-3-2)
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