32
SPARK PLUG INSPECTION
Recommended spark plugs:
NGK-CR7HSA, BOSCH-UR4AC,
Federal Mogul-P-RZ9HC
For most riding conditions this spark plug heat
range number is satisfactory. However, if the
vehicle is going to be operated for extended
periods at high speeds or near maximum
power in hot climates, the spark plug should
be changed to a cold heat range number,
consult Authorised Hero MotoCorp workshop
on this if required.
•
C any lean dirt around the spark plug base.
•
D noise suppressor (1) isconnect the cap
and remove the spark plug with the (2) help
of spark plug box wrench provided in the
tool bag.
•
Tighten a new spark plug 1/2 turn with
spark plug wrench to compress the washer.
If you are reusing a plug, it should only take
1/8-1/4 turn after the plug seats.
•
With the plug washer attached, thread the
spark plug in by hand to prevent cross-
threading.
•
Make sure that the spark plug gap is
0.6-0.7 mm using a wire-type feeler
gauge. If adjustment is necessary, bend the
side electrode carefully. Make sure the plug
washer is in good conditions.
•
Visually inspect the spark plug electrodes for
wear. The center electrode should have
square edges and the side electrode should
not be eroded. Discard the spark plug if
there is apparent wear or if the insulator is
cracked or chipped.
(2) Spark plug(1) Noise suppressor cap
1
2
30
•
Never use a spark plug with improper heat
range.
•
Do not remove the spark plug and test for
spark on the vehicle by cranking the engine
as this could lead to fire or explosion
•
Install a dummy spark plug in the cylinder
head and test for spark.
•
Always use resistor type spark plug.
CAUTION
!!
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