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146
6.
INSPECTION
AND
ADJUSTMENT
Fig.
6. 2
Rated compression
CD
Compression
gauge
fig.
6. 3
Matching mark LT
CD
Index
mark
@
AC generator
roto
r
®
"LT"
mark
f
ig.
6.
4
Adjusting tappet
cle arance
CD
Thickness gouge
®
Com
fol
low
er
shaft
@
Screw driver
(3)
To measure
the
specified
compression, meas-
urement
should
be performed
with
the
engine
warm.
d.
The
rated compression
is 13
kg/
sq
•
cm. 1185
p.s.i.l
(Fig. 6. 2)
e.
When the
compression
measures over
15
kg/
sq•cm (213
p.s.i.l
,
the combustion
chambe or
piston head
are probab
y
carb
oned.
Disas-
semble the
cy
linder head
and
cylinder,
and
clean
off
the carbon.
f.
When
the compression
is
below
l l
. 5
kg/
sp•
cm, (
164
p.s.i.l
value,
piston
ring, head
or
cylinder
gasket may be
leaking.
In this
case,
ad
just
the
tapp
ets, or
disassembling the
engine,
inspect the piston
ring,
gasket,
and
other
related parts.
2.
Tappet Ad justment
The tappet clearance
greatly
affects the
va lve
opening
and
closing timing.
when
the tappet clear-
ance
is
excessive,
the
tappet
striking
noise
become
larger, and
results in a noisy
engine.
This
clearance
affects an engine
power
,
idling,
and
noise.
l
.
Raise the seat and
remove the
fuel
tank.
2.
Re move
the
cyl inder
head cover
A (inlet side)
and B (exhaust
side!.
3.
Remo
ve
the contact
breaker
point
cover
and
the
dynamo cover.
4.
A lign
the " LT "
mark on
the dynamo
rotor
with
the
index mark
on the stator.
If the
timing
marks
of
both
the
inlet and exhaust camshafts
are aligned
to the
index
mark on the bearing
hol
der,
this
position
is the
top-dead -center
of the
intake stroke,
and
therefore,
the rotor
should
be
turned one
complete
revo
lution
to bring it to
the
top-dead-cente
r
of the compression stroke
,
in
other
words,
the
purpose is
to
place
the
left
hand piston at the
top-de ad-center
of
the com-
pression
stroke.
(Fig. 6. 3)
5.
Adjust the left hand
cylinder
tappet
clearance
.
The
standard
clearance between the cam and
the
com follower
for both the
intake
and exhaust
valves
is
0. 03
mm
(0. 0012
in).
Perform the
adjustment by loosening the com follower
shaft
lock nut
and turn the cam follower
shaft with
a
screw
driver as shown
in figure.
The adjust-
ment can
be
made between
the range
of 180°
.
{Fig.
6. 4, 6. 5)
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