Install new, properly gapped, manufacturer specified spark plug.
Stop switch must be in run position.
Perform Spark Test (See separate instructions).
Is a strong blue
spark present?
Is a spark weak
or is there no
spark?
Disconnect stop
wire from ignition
module and re-
test.
Is a strong blue
spark present?
Repair damaged
stop wire or stop
switch.
Remove ignition
module mount-
ing bolts, clean
connections, set
air gap and re-
test.
Is a strong blue
spark present?
Replace the igni-
tion module.
Remove spark
tester. Run unit.
Does engine
start and run
properly?
End Test
Inspect flywheel key and key
way for sheared key.
Is flywheel
key way
damaged?
Problem is not in igni-
tion system.
Perform cylinder
compression test.
Verify fuel system.
Replace damaged
components.
Perform visual inspection of unit.
Inspect spark plug wire, boot connections.
Repair/replace any problem items
.
NO
NO
YES
YES
NO
YES
NO SPARK
WEAK SPARK
NO
NO
YES
YES
Inspect black wire for damage.
Measure black wire between
core and end of the wire,
should show below 1.0 OHM
Is the wire
damaged ?
YES
Replace the igni-
tion module.
16.2 Ignition System Diagnostic Flow Chart
NO
English – 77
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