Checking The Spark Plugs - KEEWAY K-LIGHT 125 Owner's Manual And Warranty

Checking the spark plugs

The spark plugs are important engine com-
ponents, which should be checked period-
ically, preferably by a Keeway dealer. Since
heat and deposits will cause any spark plug
to slowly erode, they should be removed
and checked in accordance with the peri-
odic maintenance and lubrication chart. In
addition, the condition of the spark plugs
can reveal the condition of the engine.
The porcelain insulator (b) around the cen-
tral electrode of each spark plug should be
of a light tan colour (the ideal colour when
the vehicle is ridden normally), and all
spark plugs installed in the engine should
have the same colour. If any spark plug is of
a distinctly di erent colour, the engine may
operating improperly. Do not attempt to
diagnose such problems yourself.
Instead, have a Keeway dealer check the
vehicle.
If a spark plug shows signs of electrode ero-
sion and excessive carbon or other depos-
its, it should be replaced.
Speci ed spark plug:
TORCH D7RTC
Before installing a spark plug, the spark
plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted
to speci cation.
A
A. Spark plug gap
B. Porcelain insulator
Spark plug gap:
0.6~0.8 mm (0.02~0.03 in)
Clean the surface of the spark plug gasket
and its mating surface, and then wipe o
any grime from the spark plug threads.
6-11
Periodic maintenance and adjustment
Tightening torque:
15 N·m (1.5 kgf·m, 11.1 lb·ft)
TIP
If a torque wrench is not available when
installing a spark plug, a good estimate of
the correct torque is 1/4–1/2 turn past n-
ger tight.
However, the spark plug should be tight-
ened to the speci ed torque as soon as
possible.
B
EN
6