STIHL 020 T
8
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?
Adjust air gap (0.25 mm/0.010 in).
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.
Faulty insulation on ignition
lead or short circuit wire?
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
