Spark Plug - Suzuki DR-Z400S 2001 Service Manual

SPARK PLUG

Inspect every 6 000 km (4 000 miles, 6 months).
Replace every 12 000 km (7 500 miles, 12 months).
Remove the fuel tank. (
Disconnect the spark plug cap and remove the spark plug.
Cold type
NGK CR9E
DENSO U27ESR-N
CARBON DEPOSITS
Check to see if there are carbon deposits on the spark plug. If
carbon is deposited, remove it using a spark plug cleaner ma-
chine or carefully use a tool with a pointed end.
SPARK PLUG GAP
Measure the spark plug gap using a thickness gauge. If the spark
plug gap is out of specification, adjust the gap.
Spark plug gap
Standard: 0.7 – 0.8 mm (0.028 – 0.031 in)
09900-20803: Thickness gauge
ELECTRODE
Check the condition of the electrode.
If the electrode is extremely worn or burnt, replace the spark
plug with a new one.
Also, replace the spark plug if it has a broken insulator, dam-
aged threads, etc.
Check the thread size and reach when replacing the
spark plug. If the reach is too short, carbon will be de-
posited on the screw portion of the spark plug hole
and engine damage may result.
4-2)
Standard Hot type
CR8E CR7E
U24ESR-N U22ESR-N
PERIODIC MAINTENANCE
0.7 – 0.8 mm
(0.028 – 0.031 in)
2-9