Spark Plug Chart
FBO Ignition no longer offers spark plug readings over the phone or email, please use this information as a reference.
Additional tuning information available in our Tuning to Win book. Click Here
Oil Fouled |
Oil Fouled |
Carbon Fouled |
Too Cold |
Too Cold |
Cold or Rich But OK |
Cold or Rich But OK |
Cold or Rich But OK |
Good |
Good |
Good |
Good |
Real Good |
The Best |
Best |
Best |
Best |
Good |
Good |
Good |
Kinda Hot But OK |
Kinda Hot But OK |
Kinda Hot But OK |
Kinda Hot But OK |
Too Hot or Lean Pre-Ignition Range |
Too Hot or Lean Pre-Ignition Range |
Too Hot or Lean Pre-Ignition Range |
Too Hot or Lean Pre-Ignition Range |
Too Hot or Lean Pre-Ignition Range |