Troubleshooting Chart - Stihl 009 User Manual

STIHL 009, 010, 011
4.3

Troubleshooting Chart

Remove spark plug.
Is it in good condition?
Clean spark plug and reset electrode gap.
Does spark test produce powerful spark?
Is air gap correct?
Correct the air gap (0.3 mm).
Is spark test positive?
Check connections at contact breaker and
inspect breakers points. Renew burnt or pitted
points. Check and correct ignition timing and
magneto edge gap. Does engine now run?
Check condenser. In order?
Replace condenser.
Spark test positive?
Ignition system in order.
Look for fault in fuel system and carburetor.
Spark plug terminal firmly seated on spark plug?
yes
yes
no
no
Replace faulty ignition lead,
repair contact spring or ignition stop switch.
Insert screwdriver in place of spark plug in spark plug
terminal and hold about 4 mm (1/8") away from
ground. Sparkover?
no
yes
no
no
no
no
yes
no
no
no
no
Press terminal firmly onto spark
plug and fit spring if necessary.
Poor insulation on ignition lead?
Is ignition stop switch touching contact spring?
yes
yes
Fit new spark plug.
Does flywheel appear to
be in good condition?
yes
Fit new flywheel.
Is spark test positive?
Check ignition lead for break with ohmmeter.
If break is detected, replace ignition lead.
Does spark test now produce sparkover?
no
Check armature and renew if necessary.
Does engine now run after positive spark test?
23
no
no