Suzuki GP125 - Ignition System

5-1
IGNITION SYSTEM(For РЕ! type)
The magneto has three coils to meet all electric power needs - charging, lighting loads and ignition. Unlike
conventional magneto units, it is of a contactless type, i.e., no contact breaker is used.
Ignition energy is produced by a SUZUKI “PEI” system, to which the energy for initiating each ignition is
supplied from the low-speed and high-speed coils mounted in the magneto. The РЕ! system is highlighted
by these three advantages:
* For the entire speed range from low-speed to high-speed, the sparking voltage induced in the secondary
side of the ignition coil is stable.
* № need for frequent checking and servicing of the ignition system since there are no mechanical contact
points as in ordinary contact breakers.
* Ignition timing is corrected electronically to suit each level of engine speed.
Engine kill switeh
Engine kill >.
witch 2 "
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High speed
coir (t2 F а ШІ
г.р — 2% Timing и
EXE
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NIPPON DENSO
РЕ! Operating principles
When the engine is running in low-speed range,
primary coil voltage for charging the condenser
is supplied mainly from low-speed coil (L, ); in
high-speed range, however, high-speed сой (L)
supplies most of the voltage. The sum of these
two output voltages is relatively constant over
the normal engine speed range as will be noted
in Fig.
Output voltage
Ы /
p
LA High-speed сой or Pulser
Ме” coil (L2)
^7 75 d Low speed coil or Exciter
Ss, coil (L1)
Engine speed
During
half
a
revolution
of
the
magneto
rotor,
two
shots
of
energy
are
supplied
from
the
primary
coils
to
the
CDI
unit.
One
shot
is
posi
tive
and
the
other
negative
as
shown
in
Fig.
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НІ
n |
Bw =
KOKUSAN
#5
HE To timing circuit
к к ——
H To capacitor
$:
5
It is the positive shot that charges the condenser
С, the negative shot applies to the timing circuit
and triggers the SCR into conductive state.
As the SCR becomes conductive, the condenser
discharges instantly through the SCR and the
primary winding of the ignition coil to induce
the high-voltage surge in the secondary winding,
The high voltage current causes the plug to spark
two times by each rotation of crankshaft
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