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12
ADJUSTMENT-ENGINE
SPARK PLUGS
Neglecting
the spark plugs
eventually
leads
to
difficult
starting and
poor
performance. During
normal operation,
the electrodes gradual ly burn
away and carbon builds up
along
the insulator.
In
accordance
with the Periodic
Maintenance Chart (Pg. 1
O},
the
plugs should
be removed
for
inspection,
cleaning, and to reset
the
gaps.
•Remove the
spark plugs using
a
spark
plug wrench.
•Clean
the
spark
plugs,
preferably
in
a
sand-blasting
device, and
then
clean
off
any
abrasive
particles.
The
plug
may also
be cleaned using a
hgh
fl
ash-point solvent
and
a
wire
brush or other
suitable
tool. If
the
spark
plug electrodes are corroded or damaged, o
r
if the
insu lator is cracked
,
replace
the
plug. Use
the
standard
plug or
its
equivalent.
•Measure
the
spark plug gaps with
a
thickness gauge.
If
the gap
is
incorrect, carefully
bend the
side
electrode
with a suitable
tool
to
obtai
n
the correct gap.
Spark Plug Gap
Table
81
Spark Plugs
Type
NGK
D8EA or ND
X24ES-U
@
NGK
DR8ES
or
ND
X24ESR-U
Gap
0.6-0.7 mm
Tightening
2.0 kg-m
(14.5 ft-lbs)
Torque
@ :
European
model
except
Italian model
•Screw the
spark
plugs into the cylinder head and
tighten them
to the specified torque.
Connect
the
spark plug
leads.
NOTE:
Refer
to the
electrical
main tenance section, Pg.
16~, for
detailed
spark
plug
information.
IGNITION
TIMING
Incorrect ignition
timing can cause poor performance,
knocking,
overheating,
and
serious
engine damage.
Peri·
odic adjustment
will
be
necessary to
compensate for
wear of parts,
and
the ignition timing must be checked
whenever ignition related
parts have been
disassembled
or
replaced
.
Correct ignition tim ing
is
achieved
by
fi rst obtaining
the correct contact breaker point gap
(this
can
also
be
achieved by
adjust
ing
the
dwell
angle to
the specified
amount)
and
then
changing the
position
of the contact
breaker mounting
plate. Setting
the points often returns
the timing very
close
to
the
correct setting. Once the
timing has
been
adjusted,
it
may
be checked
for
accuracy
by the use
of
a strobe
light.
There
are two
sets
of
contact breaker points:
the
left
set marked "L" fires
the
spark plug on the
left,
and
the
right
set
marked "R" fires the
spark
plug
on the
right
180°
later.
The gap for each set of
poin ts
must
be
adjusted separately.
A. L Mark
B. R Mark
There are
two
sets of timing marks on the rotor. One
set marked "1" or "L"
is
for
t
im
ing the
left
cylinder,
and
the
other
set marked
"2"
or "R"
is for
timing
the
right
cyl inder. The
"F"
mark of each
set
is for checking the
timing before advancing, and the "advanced
timing
marks"
(a
pair
.of
li
nes) are for checking
the
timing
after
it has
advanced.
Timing
Marks
I
( (
I
\
\
0
1.
Left Cylinder TDC Mark
2. Left Cyl inder "F" Mark
3. Right Cylinder TDC Mark
4.
Right Cyl inder
;'F"
mark
Point Gap Adjustment
•Remove the contact
breaker
cover and gasket.
•Remove
the alternator cover.
)
/

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   Also See for Kawasaki Z250 1981

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Kz350 1981

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