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Stihl TS 420 - 8.2 Ignition timing; 8.3 Testing the ignition module

Stihl TS 420
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52 TS 410, TS 420
: Push the rubber cuff (1) off the
ignition module (3).
: Unscrew the ignition module (3)
from the ignition lead (2).
Examine the ignition module and
ignition lead, replace if
necessary.
Examine the spark plug boot,
replace if necessary, b 8.4.
Troubleshooting, b 4.4.
: Position the ignition module (1)
and insert the screw (arrow), but
do not tighten it down yet.
1
3
2
370RA193 TG
1
370RA194 TG
: Position the connector tag (1) so
that the tab (arrow) makes
contact and insert the screw, but
do not tighten it down yet.
Push the ignition module (1) back
so that the flywheel runs freely.
: Turn the flywheel until the
magnet poles (arrows) are on the
ignition module.
370RA195 TG
1
1
N
S
370RA196 TG
: Slide the setting gauge (1)
1127 890 6400 between the
arms of the ignition module and
the magnet pole of the flywheel.
Press the ignition module against
the setting gauge.
Tighten down the screws.
Tightening torques, b 3.5.
Remove the setting gauge.
Turn the flywheel to check correct
functioning: it must not touch the
ignition module.
: Reconnect the short circuit wire
and ground wire (1) and fit the
wiring harness in the retainers
(arrows).
370RA197 TG
1
370RA198 TG
1

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