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MAINTENANCE
Insta11
the
housing cover
and
tighten the
screws.
SPARK PLUG
Disconnect the
spark
plug cap
and
remove
the spark
plug.
Visually inspect
the spark plug
electrodes
for
wear.
Tile
center
electrode
should
have
square edges and
the
side
elec-
trode
should
have a
constant
thickness.
Discard
the
spark
plug
if
there
is apparent wear or if
the
insulator
is cracked or
chipped. Measure the
gap with
a
feeler
gauge
and
adjust
by carefully
bending the
side electrode.
SPARK PLUG
GAP:
0 .6
-
0 .1 mm (0 .0 24
-
0 .028 inl
RECOMMENDED REPLACEMENT PLUG
;
'88
:
NGK
:
CR6HS
'88
a
nd After '88
: NJPPONDENSQ:
U20FSR·U
After
'
S8
:
NGK
:
CR6H SA
Check
the
sealing washer and
replace
it
if
it is
damaged.
With
the
sealing
washer attached, thread the
spark
plug in by
hand
to
prevent
crossthreading.
Tighten it with
a
spark
plug
wrench.
Connect
the
spark
plug
cap.
VALVE CLEARANCE
NOTE
Inspect
and adjust valve
clearance
while
the engine is
cold
(be-
low
35
°
C,
95°F).
Remove
the
left
crankcase
cover.
Rotate the
crankshaft counterclockwise and align
the
"T"
mark
with
the
index
mark.
Remove
the tappet hole
caps
.
Make sure the piston is at
T.O.C.
on the compression stroke
by
feeling the
tappets
with your
fingers. If the
tappets
are free,
it
is an indication
that the piston
is at
top
of
the
compression stroke.
If
t
he
tappet
s are
tight, rotate the
crankshaft 360°
and re-align
the
marks.
3
-
6
0.6-0.
7m
m
=
J
r.~J;o---
'
C H"CK'
~0.02
4
-0.028
in)
GAP
DEPOSIT
DIRT
WEAR
CHECK:
SEALING
DAMAGE
CHECK:
DAMAGE
CRAC KS
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