PERIODIC MAINTENANCE 2-7
• After finishing the valve clearance adjustment, reinstall the fol-
lowing items.
* Cylinder head cover (!3-11)
* Spark plug and plug cap (! 2-7)
* Frame front cover (!5-8)
SPARK PLUG
REMOVAL
• Remove the frame front cover. (!5-8)
• Disconnect the spark plug cap and remove the spark plug.
$ 09930-10121: Spark plug socket wrench set
CARBON DEPOSIT
Check to see the carbon deposit on the plug.
If the 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 plug gap with a thickness gauge if it is correct. If
not, adjust it to the following gap.
# Spark plug gap:
Standard: 0.6 – 0.7 mm
$ 09900-20803: Thickness gauge
ELECTRODE’S CONDITION
Check to see the worn or burnt condition of the electrodes. If it is
extremely worn or burnt, replace the plug. And also replace the
plug if it has a broken insulator, damaged thread, etc.
"
Inspect at 4 000 km (20 months) and replace every
8 000 km (40 months) thereafter.
Standard
NGK CR6HSA
DENSO U20FSR-U
0.6 – 0.7 mm
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.
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