PERIODIC MAINTENANCE 2-7
CARBON DEPOSIT
• Check to see if there are carbons deposit on the plugs. If car-
bon 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 out of specifi-
cation, adjust it to the following gap.
[ 09900-20803: Thickness gauge
 Spark plug gap
Standard: 0.7 – 0.8 mm (0.028 – 0.031 in)
ELECTRODES 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.

SPARK PLUG INSTALLATION

• Install the spark plugs to the cylinder heads by finger tight,
and then tighten them to the specified torque.
! Spark plug: 11 N·m (1.1 kgf-m, 8.0 lb-ft)
TAPPET CLEARANCE
• Remove the front box. (9-18)
• Remove the foot board. (9-18)
• Remove the radiator. (8-6)
• Remove the spark plugs. (2-6)
• Remove the cylinder head cover
1.
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.
0.7 – 0.8 mm
(0.028 – 0.031 in)
Before tightening the spark plug to the specified
torque, carefully turn the spark plug by finger into the
threads of the cylinder head to prevent damage the
aluminum threads.
Inspect every 24 000 km (14 500 miles, 24 months).
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