black spark plugs - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 22 (permalink) Old 07-02-2015, 06:16 PM Thread Starter
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black spark plugs

Ok my spark plugs are black after about 30 minutes or less running. I have just replaced them and then cleaned them now twice. I think I am running rich but wanted someone to verify before I messed with my adjustment on the carbs.

If I am not mistaken unscrewing the adjuster is allowing more air in, correct?
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post #2 of 22 (permalink) Old 07-02-2015, 06:30 PM
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looks rich to me, but I am not a carb guru like some others. I would wait for their feedback

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post #3 of 22 (permalink) Old 07-02-2015, 06:35 PM
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The "air screws" is a misnomer....they are in fact "fuel enricher screws"...screwing them out adds more fuel, screwing them in makes it leaner.

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post #4 of 22 (permalink) Old 07-02-2015, 07:53 PM
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Turn each screw in 1/2 and run. Look at your plugs. If they are still pretty black, go down a pilot jet size.

Just my opinion
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post #5 of 22 (permalink) Old 07-02-2015, 09:26 PM
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Look at the poor condition of the plugs. There is no center electrode left in the plug on the right. The gap is about twice as wide as spec ( .035 ). Until you get good plugs you can't tell if you are running rich or lean.

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post #6 of 22 (permalink) Old 07-02-2015, 10:34 PM
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Quote:
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Look at the poor condition of the plugs. There is no center electrode left in the plug on the right. The gap is about twice as wide as spec ( .035 ). Until you get good plugs you can't tell if you are running rich or lean.
False... I can clearly see the electrode...

And unless you measured the gap in the picture, and had reference measurements, I doubt you can eye that gap.
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post #7 of 22 (permalink) Old 07-02-2015, 10:39 PM
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Quote:
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False... I can clearly see the electrode...

And unless you measured the gap in the picture, and had reference measurements, I doubt you can eye that gap.
Get a pair of new glasses. That is an old worn out plug.

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Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
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All LED lighting
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post #8 of 22 (permalink) Old 07-03-2015, 08:35 AM
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Quote:
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Get a pair of new glasses. That is an old worn out plug.
You are correct. Apologies.
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post #9 of 22 (permalink) Old 07-03-2015, 05:27 PM Thread Starter
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actually that is the way they came out of the box. The electrode looked just like it did the day I put them in except they are black. I only have about a hour running time on the spark plugs. The gap is also right at .35

I will do the adjustment and see how it turns out.

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post #10 of 22 (permalink) Old 07-03-2015, 05:50 PM
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Those aren't iridium plugs are they?

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