9Series 4180 Powerhead
4.3 Ignition System
Warning:
Exercise extreme caution while
carrying out maintenance and repair
work on the ignition system. The
ignition system. The high voltages
which occur can cause serious or
fatal accidents.
Condition Cause Remedy
Engine does not run No spark Check operation of slide control
and ignition module; replace
damaged parts
Spark plug dirty or faulty Clean or replace spark plug
Faulty insulation or break in ignition
coil, ignition lead or short circuit
wire
Use ohmmeter to check ignition coil
and lead for break. If break is
detected or resistance is high, fit a
new ignition coil and ignition lead;
check short circuit wire for ground
contact in run position
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
Install new spark plug
Weak spark or no spark Faulty insulation on ignition lead or
short circuit wire. Use ohmmeter to
check ignition lead for break. If
break is detected or resistance is
high, fit a new ignition lead.
Wrong air gap between ignition coil
and flywheel
Reset air gap
Flywheel cracked or damaged Install new flywheel
Spark plug dirty or faulty. Check
slide control, ignition coil/lead for
damaged insulation and leakage
current.
Clean or replace spark plug.
Replace damaged parts of ignition
system
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