Spark Plugs



Oil Fouled Oil Fouled Carbon Fouled Too Cold
Oil Fouled


Oil Fouled


Carbon Fouled


Too Cold


Too Cold OK OK OK
Too Cold


Cold or Rich
But OK


Cold or Rich
But OK


Cold or Rich
But OK


OK OK OK OK
Good


Good


Good


Good


OK Best Best Best
Real Good


The Best


Best


Best


Best OK OK OK
Best


Good


Good


Good


Hot but OK Hot but OK Hot but OK Hot but OK
Kinda Hot
But OK


Hot or Lean
But OK (?)


Hot or Lean
But OK (?)


Hot or Lean
But OK (?)


Too Hot Too Hot Too Hot Too Hot
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
Too Hot or Lean
Pre-Ignition Range