Spark Plug - Suzuki LT-Z400 Service Manual

2-10 PERIODIC MAINTENANCE

SPARK PLUG

Inspect every 6 months.
Replace every 18 months.
• Disconnect the spark plug cap 1 and remove the spark plug.
Hot type
NGK CR6E
DENSO U20ESR-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
machine 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.
% Standard
Spark plug gap: 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
deposited on the screw portion of the spark plug hole
and engine damage may result.
Standard Cold type
CR7E CR8E
U22ESR-N U24ESR-N
0.7 – 0.8 mm
(0.028 – 0.031 in)