Table of Contents
Advertisement
PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES 2-10
SPARK PLUG
I
Clean and adjust Every
6
000 km (4 000 miles)
Replace Every 12 000 krn (7 500 miles)
The plug gap is adjusted to
0.6 - 0.8
mm. The gap
is correctly adjusted using
a
thickness gauge
(special
tool).
When carbon is
deposited
on
the
spark plug, remove the
carbon
with a spark plug
cleaning machine or carefully using
tool with a
pointed end. If electrodes
are
extremely worn or
burnt, replace the plug, Also replace the plug if
it has
a
broken insulator, damaged thread, etc.
NGK
B8ES
or
NlPPON
DENSO
W24ES-U listed
in
the table should be used
as
the
standard plug. How-
wer, the heat
range of the plug should be
selected
to
meet the requirements of speed, actual load,
fuel,
&c.
If the plugs need to be replaced,
it is
recommended that the standard plugs listed in the
table be selected.
Remove the
plugs and inspect the
insulators. Proper heat range would be indicated if
both insulators were light brown
in
color.
If
they
are
blackened by carbon, they should be
repalcedl
by
a
hot type NGK B7ES or NlPPON DENSO
W22ES-U and if baked white, by NGK
B9ES
or
N lPPON
DENSO
W27ES-U.
Plugs with high
heat range
number are used
for
high
s p e d running.
These plugs are designed to
be sufficient1
y
cooled
to
prevent overheating and
are called cold
type
plugs.
09930 - f
4520
09930
-
14530
. - -
0991 4
-
24510
-
I
09900
-
20804
--
-
I
I
To
check the spark plugs, first make sure that
I
the
fuel tank contains
unleaded gasoline, and
after test ride
if the
plugs are
either sooty
1
with carbon or burnt white, replace them
Laltogether.
- - -
NOTE:
1
Confirm the thread sire and reach
when
I
Fin.
the
i s toostmrt,
1
carbon will be deposited on the screw portion
I
of the plug hole and engine
damage
may
I
resu It.
1
Socket wrench
-
-
- -
. .
Universal joint
T handle
Thickness
gauge
Gap
0.6
-
0 . 8
mrn
NGK
I
NIPPQN
DENSO
.
REMARKS
,
B7ES
!
W E S - U
If the
standard plug
is apt za
g n
m,
replace
with
mir
plug.
I
1 Hat type.
,
B8ES
'
W24ES-U
Standard
--
If the standard
plug
i s
apt
to
'B9ES
W27ES.U
overhea~, replace with
this
plug.
Cold type,
Advertisement
Table of Contents
