Spark plug color chart |
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post #1 of 9 (permalink) Old 07-25-2009, 07:58 AM Thread Starter
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Spark plug color chart

How to Read Spark Plug Colors (written by Atlantic Jet Sports)
In General: Reading spark plugs can be a valuable tuning aid. By examining the spark plug insulator color, an experienced personal watercraft engine tuner can determine valuable information about the engine's overall operating condition.

Normal: Grey to Light Golden-Brown Color

This condition is ideal, the spark plug and engine air/fuel mixture are operating properly.
Dry: Black Soot Buildup

Air/fuel mixture is too rich, the carburetor settings are incorrect, or the flame arrestor is dirty or has mounting problems.
Spark plug heat range is too cold for the operating conditions.
Ignition system problems causing a weak or intermittent spark.
Wet Fouling: Shiny, Wet, Black Appearance

Excessive use of the choke (gas fouled)
Prolonged low rpm operation (gas or oil fouled)
Fuel to oil ratio is too rich (oil fouled)
Excess Deposits: Bumpy, Chalky Buildup

Poor fuel quality
Oil leakage into combustion chamber
Improper oil used for premix/injected
Overheated: White, Blistered, Melted Electrode

Lean air/fuel mixture
Spark plug heat range is too hot for operating condition of the engine
Plug is not properly gapped and/or torqued onto head
Overly advanced timing
A detonation problem would show signs, such as silver specs, black specs, or melting or breakage at the firing tip.

NOTE: Signs of fouling or excessive heat must be traced quickly to prevent further deterioration of performance and to prevent possible engine damage.

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Last edited by Saber6; 09-07-2009 at 04:21 PM.
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post #2 of 9 (permalink) Old 11-16-2010, 06:29 PM
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color chart

Thank you for sharing this information. Honestly, I'm not familiar with the way to read this spark plug colors until now. Well, I've got to start learning it today.

Last edited by luthernil; 11-18-2010 at 01:31 AM.
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post #3 of 9 (permalink) Old 09-03-2011, 12:22 AM
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How does this look. I only went up the street and back on a new plug. I probobly need to ride longer to get a true reading tho.

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post #4 of 9 (permalink) Old 09-03-2011, 12:27 AM
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Look's lean to me what's your jetting and whats done to it, I have a 400ex and a yfz450r and neither of the plugs will change color even with a huge main jet installed so Plug color is not worth looking at, Only way to be sure is put it on the dyno

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post #5 of 9 (permalink) Old 09-03-2011, 12:33 AM
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Originally Posted by H8Monday View Post
How does this look. I only went up the street and back on a new plug. I probobly need to ride longer to get a true reading tho.


ive always ran my atv/whatever it is WOT at its highest gear. kill it, and do a plug check. thats always been the way ive done it and it works for me
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post #6 of 9 (permalink) Old 09-03-2011, 02:13 PM
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OK try this

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post #7 of 9 (permalink) Old 09-03-2011, 02:36 PM
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Thats a nice color can't get much better than that bro. what was the final set up?

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post #8 of 9 (permalink) Old 09-03-2011, 02:46 PM
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X2, looks good.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

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post #9 of 9 (permalink) Old 09-03-2011, 02:52 PM
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Thanks Guys Didn;t take long to get it set up out at the OHV park.
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