Spark Plug - Suzuki DR-Z70 Service Manual

SPARK PLUG

Inspect every 6 months.
Replace every 12 months.
REMOVAL
• Disconnect the spark plug cap 1 and remove the spark plug
2 .
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.
09930-10121: Spark plug wrench set
Hot type
NGK CR6HSA
DENSO U20FSR-U
CARBON DEPOSIT
Inspect the carbon deposit on the spark plug.
If carbon is deposited, remove it with a spark plug cleaner
machine or carefully using a tool with a pointed end.
SPARK PLUG GAP
Measure the spark plug gap with a thickness gauge. Adjust the
spark plug gap if necessary.
Spark plug gap:
Standard: 0.6 – 0.7 mm (0.024 – 0.028 in)
09900-20803: Thickness gauge
ELECTRODE'S CONDITION
Inspect the worn or burnt condition of the electrodes. If it is
extremely worn or burnt, replace the new spark plug. And also
replace the plug if it has a broken insulator, damaged thread,
etc.
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 dam-
age may result.
Standard Cold type
CR7HSA CR8HSA
U22FSR-U U24FSR-U
PERIODIC MAINTENANCE
0.6 – 0.7 mm
(0.024 – 0.028 in)
2-8