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Plug reading question?
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Posted by: Dgaffler---------------------

I just did my first WOT plug chop with a new plug. It has a (very small) light brown coloring at the very bottom (about 10% of the white area turned brown)and the upper portion of the plug is bright white, looks unused. Is this the way it should look? I was expecting it to have some color on the top as well.

Thank you.

Posted by: RM250'er---------------------

Check out this link and then click onto the link at the bottom.

Hope this helps.

Jeff

http://www.ngksparkplugs.com/techin...faq/faqread.asp

Posted by: kdxjr---------------------

I think your good !!
opps,,

Posted by: Lutz---------------------

That's the way the plug reading should be taken. That very small light brown band should probably be more of a chocolate brown, ideally, but it sounds like you are very close on your main jet. For most situations that light brown reading would probably be good, but if you get into a very high load situation, or any other situation that tends to lean out jetting, you may get too lean. Maybe up one jet size would be better, but in the end it's up to you. If you are comfortable, go with it.
Regardless, you're reading the plug the right way. Only a very small band of color on the bottom of the insulator should appear on a new plug, and it should be a "chocolate-brown" color. Any coloring on the rest of the plug comes with use, and should not be used for tuning purposes.
Good luck,
Lutz

Posted by: spanky250---------------------

This is from Eric's site:

Perfect Color
This is a perfect plug. The color is mocha brown so the carb jetting is optimum. The first three threads are black signifying the plug's heat range is matched to the application. There are relatively low deposits considering that this engine was run on regular pump petrol.

http://www.ericgorr.com/images/spark5.jpg

Posted by: spanky250---------------------

Here are a couple of good illustrations on how to correctly read plugs:

http://www.tsrsoftware.com/images/sparkplug.gif

http://www.tsrsoftware.com/read-plu...ug%20b-w%20.gif

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Plug reading question?

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