Ignition System Troubleshooting - Stihl FS 94 Instruction Manual

6.7

Ignition System Troubleshooting

Series 4149 Powerhead
Engine does not run
Stop switch lever:
– Stop switch lever not depressed?
Check the spark plug:
– Smeared with oil, black?
– Sooted?
– Electrode gap correct?
– Contacts shorted?
– Clean, readjust or replace the spark plug,
b 6.3
Check the spark plug boot:
– Firmly seated on plug (leg spring)?
– Leg spring hook in center of ignition lead?
– Boot damaged?
– If necessary, install new spark plug boot and/
or leg spring,
b 6.4
Test ignition system:
with ZAT 3 or ZAT 4
(use ZAT 3 as main spark gap
see TI 32.1994), b 6.3
1
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