As the flywheel magnet passes the CD Igni-
tion Module, AC voltage is induced into the
charge coil. The AC voltage passes through
a rectifier that transforms it into DC voltage
which is then stored in a capacitor.
POLE
SHOE
FLYWHEEL
ROTATION
5°
BTDC
SPARK PLUG
When the SCR is triggered or "fires", up to
200
volts stored in the capacitor travels to the
spark coil where it is stepped up to as much
as
25,000
volts and is discharged across the
electrodes of the spark plug.
I
!
,
CHARGING LEG
CRANKSHAFT
AT
25°
BTDC
At lower speeds, the flywheel magnet in-
At higher speeds, about
800
RPM,
the fly-
duces a small charge in the trigger coil which
wheel magnets induce a large enough
triggers
the
Silicon Controlled Rectifier
charge in the trigger coil to "trigger" the SCR
(SCR) allowing easy starting in a "retarded
retifier in the "advanced firing position" of
firing position," approximately
5°
Before Top
approximately
25°
BTDC.
Dead Center (BTDC).
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