Spark Plug Maintenance - Royal Enfield Bullet Classic EFI Service Manual

Specific Gravity
Fully charged Requires Recharging
1 .24
Check voltage with voltmeter
Voltage
Fully charged
13 .2
SP SP ARK PL ARK PL UG MAINTEN UG MAINTEN
SP SPARK PL SP ARK PLUG MAINTEN ARK PL UG MAINTEN UG MAINTENANCE
Neglecting the spark plug maintenance
eventually leads to difficult starting and poor
performance. If the spark is used for a long
period, the electrode gradually burns away
and carbon builds up along the inside part.
Once in 3000 kms or earlier, the plug should
be removed for inspection, cleaning and
resetting the gap.
1 .15
Fully Discharged
10.8
ANCE ANCE
ANCE ANCE
INSPECTION
Carbon deposits on the spark plug
establishes a 'shunt' between center and
earth electrodes, that prevents good
sparking and causes misfiring. Clean the
deposits off periodically, with a spark plug
cleaning tool / machine.
Check spark plug for pitted out the earth
and center electrodes. If the earth electrode
has worn off to a knife edge and center
electrode has reduced in height, replace it
with new.
Clean the electrodes and set gap to 0.7
mm to 0.8 mm
Clean the plug in a 'Spark plug cleaner cum
Tester'
Test the plug for proper sparking in the
tester
Light blue, solid,
continuous spark
seen in the tester
Yellow or red spark;
intermittent or no
spark; or side spark
as seen in the tester
mirror
Spark Plug OK
Spark Plug
Not OK
09-5