PERIODIC MAINTENANCE 2-5
SPARK PLUG
SPARK PLUG AND IGNITION COIL/PLUG CAP REMOVAL
• Lift and support the fuel tank. (5-3)
• Remove the air cleaner box. (5-13)
• Disconnect all lead wire couplers 1 from ignition coil/plug
caps.
• Remove the ignition coil/plug caps.
• Remove the spark plugs.
09930-10121: Spark plug wrench set
HEAT RANGE
• Check spark plug heat range by observing electrode color. If
the electrode of the spark plug is wet appearing or dark color,
replace the spark plug with hotter type one. If it is white or
glazed appearing, replace the spark plug with colder type
one.
NOTE:
“R” type spark plug has a resistor built into at the center elec-
trode to prevent radio noise.
CARBON DEPOSITS
• Check carbon deposits on the spark plug.
• If carbon is deposited, remove it using a spark plug cleaner
machine.
Inspect every 6 000 km (12 months).
replace every 12 000 km (24 months).
Disconnect the lead wire coupler before removing the
ignition coil/plug cap to avoid lead wire coupler dam-
age.
* Do not pry up the ignition coil/plug cap with a screw
driver or a bar to avoid its damage.
* Be careful not to drop the ignition coil/plug cap to
prevent short/open circuit.
Hot type Standard Cold type
NGK CR8E CR9E CR10E
ND U24ESR-N U27ESR-N U31ESR-N
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