Stihl MS 192 T Manual page 13

4.5 Ignition System
Exercise extreme caution while
carrying out maintenance and repair
work on the ignition system. The
high voltages which occur can
cause serious or fatal accidents.
Problem
Engine runs roughly, misfires,
temporary loss of power
12
Cause
Spark plug boot is loose
Spark plug sooted, smeared with oil Clean the spark plug or replace if
Incorrect air gap between ignition
module and flywheel
Flywheel cracked
or has other damage or pole shoes
have turned blue
Ignition timing wrong, flywheel out
of adjustment, key in flywheel has
sheared off
Weak magnetization in flywheel –
pole shoes have turned blue
Irregular spark
Crankcase damaged (cracks)
Remedy
Press boot firmly onto spark plug
and fit new spring if necessary
necessary
Set air gap correctly
Install new flywheel
Install new flywheel
Install new flywheel
Check operation of switch shaft and
ignition module
Faulty insulation on ignition lead or
short circuit wire, check ignition
lead / ignition module and replace if
necessary.
Check operation of spark plug
Clean the spark plug or replace if
necessary
Replace crankcase
MS 192 T