Ignition Module; Ignition Timing; Testing The Ignition Module - Stihl BR 500 Service Manual

8.1

Ignition Module

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The ignition module accommodates
all the components required to
control ignition timing. There are
three electrical connections on the
coil body:
: High voltage output (3) for the
ignition lead
: Connector tag (2) for the short
circuit wire
: Screw-mounted connector
tag (1) for the ground wire
Testing the ignition module in the
workshop is limited to a spark test.
A new ignition module must be
installed if no ignition spark is
obtained (after checking that wiring
and stop switch are in good
condition).
BR 500, BR 550, BR 600
8.2

Ignition Timing

Ignition timing is fixed and cannot
be adjusted during repair or
servicing work.
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Since there is no mechanical wear
in these systems, ignition timing
cannot get out of adjustment.
8.3 Testing the Ignition
Module
To test the ignition module, use
either the ZAT 4 ignition system
tester 5910 850 4503 or the ZAT 3
ignition system tester
5910 850 4520.
The ignition test refers only to a
spark test, not to ignition timing.
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Using the ZAT 4 ignition tester
5910 850 4503
– Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly, b 3.4
: Pull the boot off the spark plug
and connect it to the input
terminal (1). Push the tester's
output terminal (3) onto the spark
plug.
: Crank the engine quickly with the
rewind starter (min. 1,000 rpm)
and check spark in the tester's
window (2).
Warning!
The engine may start and
accelerate during the test.
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