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Kawasaki KZ1300-A1 Quick Reference Manual Page 237

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MAINTENENCE--ELECTRICAL
Ignition Circuit
+
Battery
Timing
Rotor
Spark Plugs
Ignition Coil
Pick-Up
Coil
A. IC
Igniter
The IC igniter utilizes
the voltage
pulse sent
from
the
pick·up coil
as follows
to obtain stable
induced
high
tension
voltage from
low
to
high engine speeds. The
output voltage of the pick-up coil alternates as shown
in Fig. K16.
Output Voltage
of Pick-up Coil
o
Timing
Rotor
With rotation of the timing rotor the output
voltage
rises, and the power transistor conducts and permits
IC Igniter
primary current to
flow
when the pick-up coil output
reaches
the preset voltage (Von).
When the output
voltage drops to the other preset voltage (V off) after
passing the
voltage
peak, the power transistor no longer
conducts, stopping the current
flow in
the ignition coil
primary winding and inducing a high tension voltage
that
jumps
across the spark plug electrodes.
In the
case of a standard breaker point ignition system the
dwell time (the time during which current can flow in
the primary circuit) decreases as the engine speed
increases.
This results in
less
current flow through
the
ignition
coil primary winding and decreased induced
voltage at high rpm.
Conversely the dwell time
in
this transistorized ignition system is kept relatively
constant by virtue of the pick-up coil output voltage.
Dwell Time and Primary Current
CKI1)
(Breaker Point Timing System)
c:
Primary current
~
decreases
as
...
}
/
a
dwell time
>-
decreases
V
...
"'
E
.
.:
Q..
°1
"'~
~"IOWSp:::"l1m,
POin,ts
~wlien
middle
speed}
close
Points
open {when
high
speed}
This
is
because the faster the engine runs, the higher
the output voltage of the pick-up coil becomes and
the sooner the V or
voltage
is
reached.
Therefore the
dwell angle increases to keep the dwell
time
long enough
at high engine rpm so that the induced high voltage does
not decrease.
237

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