20 7.8 Ignition System - Stihl MS 231 Manual

7.8 Ignition System Troubleshooting
– If necessary, install new spark plug boot and/
MS 231, MS 231 C, MS 251, MS 251 C
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Engine does not run
Stop switch:
– in position "
Check the spark plug:
– Smeared with oil, black?
– Sooted?
– Electrode gap correct?
– Contacts shorted?
– Clean, readjust or replace the plug,
b 7.4
Check the spark plug boot:
– Firmly seated on plug (leg spring)?
– Leg spring hook in center of ignition lead?
– Boot damaged?
or leg spring,
b 7.5
Test ignition system:
with ZAT 3 or ZAT 4
(use ZAT 3 as main spark gap
see TI 32.94),
b 7.4
1
F
"?
55