2-7 PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES
SPARK PLUGS
Inspect every 6000 km (4000 miles or 12 months) and
replace every 12000 km (7500 miles or 24 months).
l
Remove the spark plugs with spark plug wrench.
The plug gap should be 0.8 - 0.9 mm (0.031 - 0.035 in).
The gap is correctly adjusted by using the thickness gauge.
When carbon is deposited on the spark plug, remove the carbon
with a spark plug cleaning machine or by carefully using a tool
with a pointed end. If the electrodes are extremely worn or
burnt, replace the plug. Also replace the plug if it has a broken
insulator, damaged thread, etc.
09900-20804
:
Thickness gauge
09930-13210
:
Socket wrench
09930-14530
:
Universal joint
09914-24510
:
T-handle
NGK DPR8EA-9 or NIPPON DENS0 X24EPR-U9 as listed in
the table below should be used as the standard plug. However
the heat range of the plug should be selected to meet the
requirements of speed, actual road, fuel, etc. If the plugs need
to be replaced, it is recommended that ones having a heat
range closest to the standard plug in the table be selected.
When remove the plugs, inspect the insulators. Proper heat
range would be indicated if all insulators were light brown in
color. If they are blackened by carbon, they should be replaced
with hotter type ones. If they are baked white, they should be
replaced with colder type ones. Colder type plugs are designed
for high heat range and sufficiently cooled to prevent over-
heating.
Recommended spark plug
NGK
NIPPON DENS0
Hotter type
DPR7EA-9
X22EPR-U9
Standard DPR8EA-9 X24EPRU9
Colder plug
DPRSEA-9
X27EPRU9
CAUTION:
Confirm the thread size and reach when replacing the plug. If
the reach is too short, carbon will be deposited on the screw
portion of the plug hole and engine damage may result.
NOTE:
“R” type spark plug has a resistor located at the center elec-
trode to prevent radio noise.
-
-
-
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b(
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o,9 mm
7 (6.031 - 0.035
in)
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