12 TS 410, TS 420
4.4 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 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 loose in ignition
module
Secure ignition lead
Fuel/oil mixture contains too much
oil
Use a fuel mixture with the correct
mixing ratio
Incorrect air gap between ignition
module and flywheel
Set the 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 switch shaft /
contact spring, switch and ignition
module
Insulation damaged or break in
ignition lead or short circuit wire,
check ignition lead /ignition module,
replace if necessary
Check operation of spark plug
Clean the spark plug or replace if
necessary
If the engine runs roughly, this may also be due to problems in the carburetor or shortblock.
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