13MS 201, MS 201 C, MS 201 T, MS 201 TC
3.5 Ignition System
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 spark plug, replace if
necessary. If sooting continues,
check air filter
Fuel/oil mixture
– too much oil
Use correct mixture of fuel and oil
Incorrect air gap between ignition
module and flywheel
Set air gap correctly
Flywheel cracked or
damaged 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 Install new flywheel
Irregular spark Check operation of switch shaft /
contact spring(s) and ignition
module.
Check ignition lead and short circuit
wire for damaged insulation or
break.
Check ignition lead / module,
replace ignition module if
necessary. Check operation of
spark plug, clean or replace spark
plug if necessary.
Crankcase damaged (cracks) Install new crankcase
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