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Ignition System - Kawasaki KZ1300-A1 Quick Reference Manual

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SUPPLEMENT--1982 MODEL
Ignition System
Introduction:
The 1982 model employs
a
transistorized ignition
system with no mechanical contact breaker. This system
is essentially a battery and coil ignition system where
the battery supplies the current for the primary circuit
in the ignition system.
The current for the primary
circuit is controlled by use of an electronic switch called
a power
transistor.
Moreover, the ignition timing is
advanced not by a centrifugal advance mechanism but
by an electronic circuit in the IC
igniter:
the electronic
advance system. Since there are no moving mechanical
parts to wear out, no maintenance is required.
The
working electrical part of ignition system consists of a
battery, three pickup coils, an IC igniter, three resistors,
and three ignition coils. The schematic wiring diagram
of ignition system is shown in fig. N111.
Main Component Parts:
Pickup Coil Assembly:
Three pickups are fastened onto the crankcase inside
the alternator cover so that they will be close to the
alternator rotor, and equally spaced on a circle. One is
for #1 and #6
cylinders,
another for the #2 and
#5 cyl-
inders, and the third for #3 and #4 cylinders. The pick-
up coil is a magnetic signal generator which consists of a
permanent magnet and coil. Two timing projections are
positioned on the outside of the alternator rotor, and 45
degrees apart from each other.
Output of Pickup Coil
(a) Output Voltage of Pickup Coil for
#1
&
#6 Cyl.
Every time the timing projection passes under the
pickup coil core, a signal is generated and sent to the IC
igniter.
The outputs of pickup coil is shown in fig.
Nll0.
IC Igniter:
The IC igniter is located inside the right side cover
and has the following functions.
(1) Electronic ignition timing advance
The timing control circuit is provided in the IC igniter,
and the ignition timing is controlled electronically so that
it advances as the engine speed
rises.
(2) Time-controlled cutting off
If the ignition switch is left turned on but the engine
is not running, the primary current may continue to
flow through a certain ignition coil (depending on the
crankshaft position).
If this condition continues, the
battery will be discharged, and the ignition coil and the
power transistor will be damaged by overheating. To
prevent such a problem, a timer circuit
is
provided to cut
off the primary current automatically a few seconds after
the engine stops. However, once the engine is cranked
and the first signal from the pickup arrives at the igniter,
the timer circuit returns to its original state to permit
the primary current to flow.
~--1200--~
....
--1200--~
....
--1200--~
+
o
BTDC 55°
BTDC 10°
(b)Output Voltage of Pickup Coil for #2
&
#5 Cyl.
+
o
BTDC 55° BTDC 10°
(c) Output Voltage of Pickup Coil for #3
&
#4
Cyl.
+
o
Crankshaft Rotation
Crankshaft Rotation
BTDC 55° BTDC 10°
Crankshaft Rotation
355

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