STIHL 064, 066 11
2.3 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!
Ignition system in order.
Look for fault in fuel system and
carburetor.
yes
Replace ignition module. Does engine now run after
positive spark test?
Fit new flywheel.
Is spark test positive?
Use ohmmeter to check ignition lead
for break. If break is detected, replace
ignition lead.
Does spark test now produce sparkover?
Does flywheel appear to be
in good condition?
Fit new spark plug.Is air gap correct?
Correct the air gap (0.2 - 0.3 mm).
Is spark test positive?
Insert screwdriver in place of spark plug in spark
plug terminal and hold about 4 mm (1/8") away from
ground. Sparkover?
Replace faulty ignition lead of short circuit wire.
Repair contact spring or switch shaft.
Faulty insulation on ignition lead
or short circuit wire?
Is connector sleeve touching
short circuit contact?
Clean spark plug and reset electrode gap.
Does spark test produce powerful spark?
Press terminal firmly onto spark plug
and fit spring if necessary.
Spark plug terminal firmly seated on spark plug?
Remove spark plug.
Is it in good condition?
no
no
no
no
no
yes
no
no
yes
yes no
no
no
no
yes
yes
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