Stihl MS 251 Instruction Manual - Page 56

Ignition System Troubleshooting, Leg spring hook in center of ignition lead?

Page 56 highlights

7.8 Ignition System Troubleshooting Engine does not run Stop switch: - in position "F"? 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? - If necessary, install new spark plug boot and/ 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 MS 231, MS 231 C, MS 251, MS 251 C 55

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55
MS 231, MS 231 C, MS 251, MS 251 C
7.8
Ignition System Troubleshooting
Engine does not run
Stop switch:
– in position "
F
"?
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?
– If necessary, install new spark plug boot and/
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