spark plug color, what color is good in your oppinions - Yamaha Raptor Forum

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Old 05-25-2008, 01:55 PM   #1 (permalink)
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Default spark plug color, what color is good in your oppinions

hey everybody, i jus tuned my carbs again because i had them rich, and the spark plug was black. i dropped the needles and now its running the best its ever ran. my question is the spark plug is like a gray smokey color, i was jus wondering if its a good color, the porcelein isnt white so i know its not running to lean, but jus wondering if anybody elses is that color, thanks
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Old 05-25-2008, 03:18 PM   #2 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

A light gray to tan is what you should be shooting for...


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Old 05-25-2008, 03:58 PM   #3 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

He is right.
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Old 05-25-2008, 06:52 PM   #4 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

A little grey is too lean my boys, you want it very light brown to white, grey is leaner yet and then if you are leaner then that the plug turns black again.
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Old 05-25-2008, 06:55 PM   #5 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

a shop rap7 talked to said telling by the plug is about outdated with newer motors... it can help telling in extremes... extreme rich/lean.. but to be completely accurate you need to monitor the air/fuel ratio. think that was the gist of what he told nick... maybe he'll chime in if i missed more
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Old 05-25-2008, 07:00 PM   #6 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

Maybe it is but it sure beats guessing, I also look at the electrode and watch the colours there.

A sparkplug rep from NGK imformed me last year in a seminar that reading plugs was the only way to tell how an engine was doing internally, and also how well each cylinder was performing, the only other way would be to hook up and oxygen sensor to each cylinder, in multiple cylinder arrangements and diagnose each cylinder individually, he worked with Formula 1 and Nascar setting up there race cars by tuning with sparkplugs.
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Old 05-25-2008, 07:02 PM   #7 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

yeah that's why i have a wideband kit to monitor air / fuel with an 02 sensor
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Old 05-25-2008, 07:05 PM   #8 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

Quote:
Originally Posted by evlls1
yeah that's why i have a wideband kit to monitor air / fuel with an 02 sensor
Now lets say you have a multiple cylinder arrangement and you hook up your air fuel moniter, it will give the results of all cylinders combined, and lets say that a couple cylinders are running rich and a couple are lean, how would the sensor know which ones are lean and which ones are rich?
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Old 05-25-2008, 07:20 PM   #9 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

well on a vehicle you mount two air fuel gauges. With two gauges you can view four parameters at a time, but you can set it to cycle through your list of paramaeters and their their cycle time each. helps monitor everything once you start doing heavy modding so you know what's going on http://www.xtreemkreations.com/Gauge1.jpg
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Old 05-25-2008, 08:10 PM   #10 (permalink)
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Default Re: spark plug color, what color is good in your oppinions

Let's see if we can pull this back in a little... here's one of the better charts I found online when I was looking a few weeks ago:



http://www.4secondsflat.com/plug_chart.html



You can click on them to get a close up


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