Ignition Coil
The ignition coil is a sort of miniature transfor-
mer and, as such, has an iron core around which
two coils are wound
-
primary and secondary
windings mentioned above. The two are so close
to each other that a sudden change in the
magnetic flux produced by “primary current”
flowing in primary winding (in a less number of
coil turns) induces a very large electromotive
force (voltage) in secondary winding (in a
greater number of coil turns). These live parts
are housed in a tight, insulator case topped by
the cap. Note that the cap has three terminals:
one high-tension terminal and two low-tension
terminals.
High-tension
terminal
Primary terminal
lt-
Case
It
Primary winding
II
Secondary winding
j-
Core
m
2
I,,,
insulator
Fig. 8-5
Spark Plugs
Each new machine shipped from the factory is
fitted with standard plugs.
Copper core
Center electrode
Fig. 8-6
Insulator
Standard type
Cold type
NGK
BPRdES
BPR-6ES
Nippon
Denso
WlGEXR-U
W’LOEXR-U
8-4
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