Ignition System - Husqvarna K 1260 Workshop Manual

6
C� B�
� �
2�
3�
�
�
.02 in.
0.5 mm
13

IGNITION SYSTEM

2�
�
+
Volts
Ignition
point
0
3�
-
1�
�
�
Electronic
circuit
A� D�
breaker
� �
STOP
1�
control
�
Ignition module
The ignition module components are fully enclosed to withstand external
effects. Individual components cannot be replaced.
ignition module can be replaced.
distance to the flywheel magnet can be adjusted where necessary.)
ignition module. The arrow-marked flat pin connector connects to the stop
switch. The other is the power outlet for machines with OilGuard.
Spark plug
The electrode gap scale should
be .02 in./0.5 mm.
Function
The ignition system is fully enclosed and has no moving
parts. It is insensitive to moisture and dirt. The design is
such that the ignition point does not need to readjustment.
Husqvarna K1260 has integrated overspeed protection in
the electronic unit that limits the engine's speed to 9,300
rpm.
The ignition system consists of the primary coil (A) and
secondary coil (B) which are both surround ed by the iron
core (C). An electronic digital unit (D) manages the switch
function.
Current is generated in the primary coil when the fly -
wheel's permanent magnet passes the coil and has the voltage
sequence illustrated in the diagram below. (The dashed line
indicates the voltage that should be generated if the current
is not broken.)
The ignition point is determined by the electronic unit,
which sense the voltage variation in the primary coil and
breaks the current at the right level, at the same time the
engine piston is just below the upper turning point. At the
breaking instant the voltage in the primary coil rises from
5 V (volt) to approximately 200 V through induction. At the
same time a high voltage, approximately 20,000 volt, is
transformed in the secondary coil to the spark plug.
The ignition cable, the contact unit to the spark plug and the seal on the
The ignition module requires no routine service measures. (However, the
Besides the connection to the spark plug there are two connections on the
Spark plug
The spark plug's electrode gap should be
.02 in./0.5 mm.
The electrodes should be free of soot
deposits and oil. Brush clean with a wire
brush.
A convex centre electrode and a worn
side electrode impair the ignition charac-
teristics. Replace the spark plug.