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52
Fig.
1
·9
(l
)
Alignment mark
@
Flywheel
Fig.
1
-10
I
Thi
ckness
gaug
e
(0.05
mm
:
0 .002
In
)
16,
Nut
r3'
Screw
•4'
Tappet ad-
j
usti
ng cap
3.
Greasin
g
Pa
rts
which r
e
quire lubricating with grease.
Apply
grease
to
grease
nipples
w
i
t
h grease gun.
(Fig. 1
7
,
8
)
Parts
not
requiring
periodic oil
change or
lubrica-
tion
.
There
are some
parts which
do
not reQuire regula
r
lubrication. they are only lubrica
t ed
whenever
the
par
t
s
are disassembled for repair or replacement.
or when
overhauled.
These
part
s
are
:
r hrot tie
grip
Bot tom
ball race
Top
ball race
Main
stand
Front and rear wheel
bearings
B.
Engine
1.
Tappet
Clearance
Adjustment
Th'!
tappet
clearance
will have a
great
deal
of ef
feet on
the
valve
timing.
Further. if
t11e
c
learance
is
too
small,
it may prevent the v alve from fully
closing
and
result
111
pressure leak
at
the
valve.
On the
other
hand.
an excessive tappet
c
learance
will
produce
tappet
noise.
causing
noisy
engine
operation.
The
tappet
clea·
ranee will
also
have
a
varying
deg
ree
of
e ffec
t
on
the
engine
power
output
and engine
operation.
(
1
)
Remove the
dynamo cover and
al
ign th
e
t
iming
mark
•·
T"
on
the flywheel
wi
t
h
the
timing
index
mark
on the
c
rankcase.
(Fig,
1-
9
)
(
2
)
Remove
the
tappet
ad
just
ing
cap on
t
he cylinde
r
head and
check t
he
clearance between
t
he
adjust·
ing screw and
the
valve. If the valve is
actuated
by the screw.
rotate
the
flywheel
one
comple
te
revolu tion and
realign
the
timing marks to
set
the
piston at top.dead.center
of the
compression
s
trok
e.
Check
the
t
appet c
learance
wi
th
a
thickness g
auge
to
see
if
it is of
st
andard
c
lear
-
ance
of
0 .05
mm
(0 .002
in).
If
ad justment
is
necessary
,
loosen
t
he
adjusting
screw lock
nut
and
make the
adjustment
wi
t
h
the adjusting
screw.
Both the
inlet
and exhaust
va lves
should
be set
to the
same cle
arance.
Lock
t
he
adjust·
ing screw after
t
he adjustmen
t
has been com-
plet
ed.
(Fig.
1- 10)
-
NOTE
-
1.
The
adjustment must be
made with
a
cold
engine
.
2
.
When tightening the adjusting scl"ew
lock
nut,
hold the
screw
to pevent its
turning.
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Troubleshooting
