Service And Maintenance Of The Spark Plug - um CHILL 125 cc. Service Manual

Service and Maintenance of the Spark Plug

Type of spark plug: Connecting screw, flat seating, with nut
Service of the spark plug:
Take off the spark plug. When the color of the insulator skirt of the spark plug is
offwhite, it indicates overheat of the engine. Generally, the engine overheat
may be caused by the following reasons:
 The heat value of the spark plug is too small, and it should be replaced
with a spark plug with appropriate heat value.
 The spark plug thread is too large, then the insulator excessively
extrudes into the combustion chamber. It is necessary to adjust the
thread area of the spark plug.
 The overheat of the engine is caused by the friction in transmission
parts of the engine.
Take off the spark plug. If it is found that the color in the insulator of the spark
plug is dark-black, or there is serious oil stain or dark black carbon deposit on
the surface.
Check the electrode gap of
the spark plug with a plug
gauge, and adjust the gap
to 0.6mm -0.7mm.
CHILL 125 cc. SERVICE MANUAL AND EFI DIAGNOSTIC
Side
electrode
The normal skirt of
the insulator of the
spark plug is brown.
Take off the spark plug. If it is found that the color of the insulator skirt of the
spark plug is brown, it indicates that the engine works properly, and there is
nothing wrong with the spark plug.
Cleaning the Spark Plug
Caution
In cleaning the spark plug, make sure not to damage the insulator. It is
forbidden to remove the carbon deposit or filth by burning with fire or
scrubbing with metal wires.
First, soak it with spark plug
detergent or gasoline for about
half an hour and then use a
non-metal blade to remove the
carbon deposit surrounding the
spark plug, and finally clean the
spark plug with gasoline.
First, mount the sealing washer
onto the spark plug, and then
tighten the spark plug to place
with hands, and finally tighten
the spark plug with a socket
spanner
.
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