Spark Plugs


The Bible tells us---
"Where no counsel is, the people fail:
but in the multitude of counsellors there is safety."

Proverbs 11:14

So to prevent you from failing Spark Plug reading here is a multitude of counsellors in picture form.

I got all this from a Free hand out I recieved from NGK Spark Plugs back in 1977. I think their Hot-but-OK plug pictures are a bit too hot for me. But who am I to nay say NGK? Enjoy!


 

Oil Fouled Oil Fouled Carbon Fouled Too Cold
1
Oil Fouled


2
Oil Fouled


3
Carbon Fouled


4
Too Cold


Too Cold OK OK OK
5
Too Cold


6
Cold or Rich
But OK


7
Cold or Rich
But OK


8
Cold or Rich
But OK


OK OK OK OK
9
Good


10
Good


11
Good


12
Good


OK Best Best Best
13
Real Good


14
The Best


15
Best


16
Best


Best OK OK OK
17
Best


18
Good


19
Good


20
Good


Hot but OK Hot but OK Hot but OK Hot but OK
21
Kinda Hot
But OK


22
Hot or Lean
But OK (?)


23
Hot or Lean
But OK (?)


24
Hot or Lean
But OK (?)


Too Hot Too Hot Too Hot Too Hot
25
Too Hot or Lean
Pre-Ignition Range


26
Too Hot or Lean
Pre-Ignition Range


27
Too Hot or Lean
Pre-Ignition Range


28
Too Hot or Lean
Pre-Ignition Range


Too Hot
29
Too Hot or Lean
Pre-Ignition Range


30
Burned on Antifreeze


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