Stihl TS 420 - 8.4 Spark plug boot

53TS 410, TS 420
: Press the ignition lead (1) into the
cable guides (arrows).
– Push the spark plug boot onto the
spark plug.
– Reassemble remaining parts in
reverse order.
8.2 Ignition timing
Ignition timing is fixed and cannot
be adjusted during repair work.
Since there is no mechanical wear
in these systems, ignition timing
cannot get out of adjustment during
operation.
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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 the ignition timing.
Using the ZAT 4 ignition system
tester 5910 850 4503
– Before starting the test, install
a new spark plug in the cylinder
and tighten it down firmly.
– Tightening torques, b 3.5.
: Connect the spark plug boot to
the input terminal (1). Push the
tester's output terminal (3) onto
the spark plug.
Danger!
High voltage – risk of electrocution.
: Crank the engine quickly with the
rewind starter and check
sparkover in the window (2) of the
ignition system tester.
The engine may start and
accelerate during the test.
VA
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If a spark is visible, the ignition
system is in order.
If no spark is visible in the
window (2), check the ignition
system with the aid of the
troubleshooting chart, b 8.7.
Using the ZAT 3 ignition system
tester 5910 850 4520
– Before starting the test, install
a new spark plug and tighten it
down firmly.
– Tightening torques, b 3.5.
– Connect the spark plug boot to
the terminal (2).
: Attach ground terminal (1) to the
spark plug.
: Use adjusting knob (4) to set the
spark gap to approx. 2 mm, see
window (3).
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