13MS 441, MS 441 C
4.5 Ignition system
Extreme caution must be exercised
when looking for faults and when
carrying out maintenance and repair
work on the ignition system.
The high voltages occurring can
cause serious or fatal accidents!
Condition Cause Remedy
Engine runs roughly, misfires,
temporary loss of power
Spark plug boot is loose Press boot firmly onto spark plug
and fit new spring if necessary
Spark plug sooted, smeared
with oil
Clean the spark plug or replace
if necessary
Ignition lead is loose in ignition
module
Secure ignition lead
Fuel/oil mixing ratio – contains too
much oil
Use fuel mixture with correct mixing
ratio
Incorrect air gap between ignition
module and flywheel
Set correct air gap
Flywheel cracked or has other
damage or pole shoes have turned
blue
Install new flywheel
Ignition timing wrong, flywheel out
of adjustment, key in flywheel has
sheared off
Install new flywheel
Weak magnetization in flywheel –
pole shoes have turned blue
Install new flywheel
Irregular spark Check operation of switches/
contact springs and ignition
module.
Faulty insulation or break in ignition
lead or short circuit wire.
Check ignition lead/ ignition module
and replace if necessary.
Check operation of spark plug,
clean spark plug and replace if
necessary.
Crankcase damaged (cracks) Replace crankcase
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