Spark Plug - Suzuki VL125 Service Manual

2-6 PERIODIC MAINTENANCE

SPARK PLUG

Clean every 4 000 km (20 months) and replace every 8
000 km (40 months).
REMOVAL
• Disconnect the spark plug caps.
• Remove the spark plugs.
% 09930-10121: Spark plug socket wrench set
Standard
NGK CR8E
DENSO U24ESR-N
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.
#
Standard: Spark plug gap: 0.7– 0.8 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.
7
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.
INSTALLATION
7
Before using a spark plug wrench, carefully turn the spark
plug by finger into the threads of the cylinder head to
prevent damage the aluminum threads.
• Install the spark plug to the cylinder head by finger tight, and
then tighten it to the specified torque.
" Spark plug: 11 N . m (1.1 kgf . m)
Cold type Hot type
CR9E CR7E
U27ESR-N U22ESR-N
0.7 – 0.8 mm