12 MS 650, MS 660
4.4 Ignition System
Warning!
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.
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
Ignition lead loose in ignition
module
Secure the ignition lead
Spark plug sooted, smeared
with oil
Clean the spark plug or replace if
necessary
Too much oil in fuel mix, poor
quality oil
Fill up with fuel mix of specified
quality
Incorrect air gap between ignition
module and flywheel
Set air gap correctly
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 or is missing
Install new flywheel, fit new key
Weak magnetization in flywheel –
pole shoes have turned blue
Install new flywheel
Crankcase damaged (cracks) Replace crankcase
No spark Faulty Master Control lever or
ignition module
Check operation of Master Control
lever and ignition module
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