PERIODIC MAINTENANCE 2-7
NOTE:
* The piston must be at “TDC” on the compression stroke in
order to check the valve clearance or to adjust valve clear-
ance.
* The clearance specification is for COLD state.
* To turn the crankshaft for clearance checking, and rotate in
the normal running direction.
• Turn the crankshaft to bring the “TDC” line
A on the genera-
tor rotor to the index mark
B on the generator cover.
• Insert the thickness gauge between the valve stem end and
the adjusting screw on the rocker arm.
If the clearance is out of specification, bring it into the speci-
fied range.
% 09900-20803: Thickness gauge
09917-14910: Valve clearance adjusting driver
# Valve adjusting screw lock-nut: 10 N·m (1.0 kgf-m)
• Install the cylinder head cover. ("3-71)
SPARK PLUG
REMOVAL
• Remove the front frame cover. ("8-8)
• Disconnect the spark plug cap
1.
• Remove the spark plug.
% 09930-10121: Spark plug wrench set
CARBON DEPOSIT
Inspect the carbon deposit on the plug.
If the carbon is deposited, remove it with a spark plug cleaner
machine.
Inspect every 4 000 km (2 500 miles, 20 months) and
replace every 8 000 km (5 000 miles, 40 months) there-
after.
Standard Cold type Hot type
NGK CR8E CR9E CR7E
DENSO U24ESR-N U27ESR-N U22ESR-N
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