Suzuki DR·Z400SM Owner's Manual page 38

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Your motorcycle comes equipped
with DENSO U24ESR-N or NGK
CR8E spark plug. To determine if
the standard spark plug is right for
your usage, check the color of the
plug's porcelain center electrode
insulator after motorcycle opera­
tion. A light brown color indicates
that the plug is correct. A white or
dark insulator indicates that the
engine may need adjustment, or
another plug type may be needed.
Consult your Suzuki dealer or a
qualified mechanic if your plug
insulator is not a light brown color.
CAUTION
An improper spark plug may
have an incorrect fit or heat
range for your engine. This
may cause severe engine dam­
age which will not be covered
under warranty.
Use one of the spark plugs
listed in the table or equivalent.
Consult your Suzuki dealer or a
qualified mechanic if you are
not sure which spark plug is
correct for your type of usage.
. . . 5Sftt
NGK DENSO REMARKS
CR7E U22ESR-N
II the standard
plug tends to run
cold
CR8E
U24ESR-rJ
Standard
CR9E U27ESR-N
If the standard
plug tends to run
cold.
NOTE: If the above-named plugE
are not available, consult yoU!
Suzuki dealer.
NOTE: This motorcycle useE
resistor-type spark plug to avoio
jamming electronic parts
Improper spark plug selectior
may cause electronic interfer
ence with your motorcycle's igm­
tion system, resulting ir
motorcycle performance prob
lems. Use only the recommendec
spark plugs.
o r
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To install a spark plug, turn it in as
tar as possible with your fingers,
then tighten it with a wrench
CAUTION
A crossthreaded or overtight­
ened spark plug will damage
the aluminum threads of the
cylinder head.
Follow the procedure below to
tighten the spark plug properly.
CarefUlly turn the spark plug by
hand into the threads until it
IS
fin­
qer tight. If the spark plug is new,
lighten it with a wrench about 1/2
lurn past finger tight.lf you are
reusing the old spark plug, tighten
it with a wrench about 1/8 tu rn
past finger tight.
CAUTION
Dirt can damage your engine if
it enters an open spark plug
hole.
Cover the spark plug hole
whenever the spark plug is
removed.
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- ,
0.7 - 0.8 mm
(0028- 0.031
in)
To maintain a hot, strong spark,
keep the plug free from carbon.
Remove the carbon deposits peri­
odically from the spark plug.
Adjust the gap to 0.7 - 0.8 mm
(0.028 - 0.031 in) for good igni­
tion. Use a thickness (feeler)
gauge to check the gap.
NOTE: Fit the spark plug dust
cover securely to keep the spark
plug clean and dry
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