Ignition System - Stihl MS 231 Manual

3.5

Ignition System

Condition
Engine runs roughly, misfires,
temporary loss of power
14
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Cause
Spark plug boot is loose
Spark plug sooted, smeared with oil Clean the spark plug or replace if
Fuel/oil mixture
– too much oil
Incorrect air gap between ignition
module and flywheel
Flywheel cracked or
damaged or pole shoes have
turned blue
Ignition timing wrong, flywheel out
of adjustment
– key in flywheel has sheared off
Weak magnetization in flywheel
Irregular spark
Remedy
Press boot firmly onto spark plug
and fit new spring if necessary
necessary.
If sooting keeps recurring, check air
filter
Use correct mixture of fuel and oil
Set air gap correctly
Install new flywheel
Install new flywheel
Install new flywheel
Check operation of switch shaft/
contact spring and ignition module
Damaged insulation or break in
ignition lead or short circuit.
Check ignition lead/module,
replace ignition module if
necessary.
Check operation of the spark plug,
clean or replace spark plug if
necessary.
MS 231, MS 231 C, MS 251, MS 251 C