Electrical System
68 24 690 06 Rev. PKohlerEngines.com
Condition Possible Cause Conclusion
Both cylinders have good spark but
engine runs poorly or existing plug
condition is questionable.
Spark Plug(s) Install new spark plug(s) and retest
engine performance.
If problem persists, check for timing
advance.
1 cylinder has good spark and other
cylinder has no or intermittent spark.
Ignition Test ignition modules and
connections.
Spark on both cylinders but power is
suspect.
Timing Advance
Sheared Flywheel Key
Check for timing advance.
Check for broken key.
Test Timing Advance
1. Make a line near edge of fl ywheel screen with a marking pen, chalk, or narrow tape.
2. Connect an automotive timing light to cylinder that had good spark.
3. Run engine at idle and use timing light beam to locate line on screen. Draw a line on blower housing next to line
on screen. Accelerate to full throttle and watch for movement of line on screen relative to line on blower housing. If
both cylinders had good spark, repeat test on other cylinder.
Condition Possible Cause Conclusion
Line on screen did not move away
from line on blower housing during
acceleration.
Ignition Test ignition modules and
connections.
Lines made on blower housing not
90° apart.
Test Ignition Systems
NOTE: If engine starts or runs during testing, you may need to ground kill lead to shut it down. Because you have
interrupted kill circuit, it may not stop using switch.
Isolate and verify trouble is within engine.
1. Locate connectors where wiring harnesses from engine and equipment are joined. Separate connectors and
remove white kill lead from engine connector. Rejoin connectors and position or insulate kill lead terminal so it
cannot touch ground. Try to start engine to verify whether reported problem is still present.
Condition Possible Cause Conclusion
Problem goes away. Electrical System Check key switch, wires, connections,
safety interlocks, etc.
Problem persists. Ignition or Electrical System Leave kill lead isolated until all testing
is completed.
Identify white kill lead of engine
wiring harness connector. Establish
a connection to a known good
ground location. Engine should kill
completely. If not or only one cylinder
is aff ected, test ignition modules and
white kill lead connection.
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