74-20-00
IGNITION TROUBLESHOOTING.
This troubleshooting chart is provided as a guide. Review all probable causes given, check
other listings of troubles with similar symptoms. Items are presented in sequence of the
approximate ease of checking, not necessarily in order of probability.
Spark plugs fouled, improperly Remove and clean. Adjust to
gapped, or loose. proper gap. Tighten to specified
Magnetos improperly timed to
Refer to
Installation of Magnetos
and lgnition Timing for timing
Rough Idling
Rough At
Idle
Above idle
Sluggish Operation
And/or Excessive
RPM Drop
Shorted condenser.
Magneto internal timing incorrect
or timed for opposite rotation.
Spark plugs fouled or improperly
gapped.
Weak condenser.
Loose or improperly gapped
spark plugs.
High tension leak in ignition
harness.
Weak or burned out condenser as
evidenced by burned or pitted
breaker points.
Fouled
or
dead spark plugs.
Improperly gapped spark plugs.
Magnetos out of time with plugs.
Damaged magneto breaker
points or condenser.
Replace condenser.
Install correctly timed magneto.
Clean spark plugs. Adjust spark
plug gap.
Replace condenser.
Tighten to specified torque.
Adjust to proper gap.
Check for faulty inspection.
Replace points and condenser.
Clean spark plugs. Replace dead
spark plugs.
Adjust to proper gap.
Refer to Installation of Magnetos
and lgnition Timing for proper
timing procedure.
Replace points and condenser.