Spark plugs
...Used Plugs Tell a Story". Let the condition of your spark plugs show you where
you can improve your engine's performance. An illustrated guide by ChampionŽ.
Normal
Correct heat range.
Service or replace.
Ash Deposits
Derived from oil
and/or fuel additives.
Worn Out
Replace with new
Champions.
Preignition
Check plug heat
range and engine
adjustments.
Carbon Deposits
Check correct heat
range, rich mixture
or weak ignition.
Core Nose
Fracturing
Improper gap
setting techniques
or detonation.
Splashed Deposits
Service and reinstall.
Too Hot
Check for correct
heat range and
engine adjustments.
Oil Deposits
Poor oil control.
High Speed Glazing
Replace with
colder heat range