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Correct spark plug color?

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Old 11-23-2003, 03:49 PM
ck85abc ck85abc is offline
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Correct spark plug color?

When I tested my spark plugs I got the below.

There two area's were the spark arc's across: Brown and whites. Has white speckles and wereever it is not white it is brown. About 50-60% white.

The walls going down to the inside of the plug: All black.

The inside of the plug but not the walls: All brown.

How is my engine running? Do I need to chagne anything? If so what?

I really wish I knew some technical terms here so I did not have to describe stuff like that
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Old 11-23-2003, 04:36 PM
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fordman428 fordman428 is offline
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well when the end up the plug is brown it means its running good, if its black it means its getting to much fuel, if its whit it is to lean not enough fuel, sounds like u may need to adjust the carb give it a little more fuel not much cuz as u stated there is brown on them and that means its running well but sense theres white on it, that means its to lean so adjust your carb to give it a little more gas and you should be alright, good luck
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Old 11-23-2003, 04:39 PM
jwtaylor jwtaylor is offline
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your mention of brown sounds normal. The white speckles and white electrode could mean the plug is too hot. Make sure the plug you are using is the correct heat range. Other causes could be overadvanced ignition timing, lean air/fuel mixture, vacuum leak (intake manifold), sticky valves or insufficient cooling.

Is the engine efi or carb? Have you changed anything lately such as the intake or carb? Are the correct spark plugs being used? Have you messed with the timing? Anything out of the ordinary happening? later
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Old 11-24-2003, 02:57 PM
ck85abc ck85abc is offline
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Thanks for the usefull information. Ill look into all that stuff. I thought that the tip of the plug was not acually were you were supposed to be looking though? More like down at the base of the plug?
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