Seeking expert spark plug readers.


Technical information and Q&A applicable to all years and models of Goldwings
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saamiam
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Seeking expert spark plug readers.

Post by saamiam »



Happy and blessed New Year's brothers. I was wondering if you would be so kind as to give me your best expert or non-expert observation, opinion, Or other with regards to the four spark plugs in the picture below. They are cylinders 1,2,3,4 from left to right.. Thank you in advance and all, all opinions are welcome.

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winguyjo
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Re: Seeking expert spark plug readers.

Post by winguyjo »

no expert here, but cylinder 1 is rich or mis-firing ... the other 3 are probably not really as lean as the picture makes them appear so i wouldnt worry about them for now.

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saamiam
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Re: Seeking expert spark plug readers.

Post by saamiam »

Thank you good sir...

Oh BTW, here is my beloved 86 aspencade today.. she's been on a bit of a diet..
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ct1500
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Re: Seeking expert spark plug readers.

Post by ct1500 »

Your #1 plug is badly fouled so in essence the engine is running on 3-3 1/2 cylinders. First do a compression test on engine to eliminate mechanical problems with that cylinder. If spark quality is okay up to including spark plug then start looking into the carb.
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Redwing52
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Re: Seeking expert spark plug readers.

Post by Redwing52 »

All good answers. I would add that a black plug like that does not guarantee a rich mixture. The mixture can be so lean it can not fire. Still has fuel in the combustion chamber but not enough for a normal fire. It can just "fizzle" (misfire) causing a spark plug like you have. Don't pull your hair out chasing just a rich condition. If the other 3 plugs are new there is not enough time on them to read yet. If you look at the bottom of the porcelain there might be the start of coloring don there.

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WingAdmin
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Re: Seeking expert spark plug readers.

Post by WingAdmin »

You could also check: "How to 'read' spark plugs"

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saamiam
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Re: Seeking expert spark plug readers.

Post by saamiam »

Redwing52 wrote:
Wed Jan 13, 2021 10:59 am
All good answers. I would add that a black plug like that does not guarantee a rich mixture. The mixture can be so lean it can not fire. Still has fuel in the combustion chamber but not enough for a normal fire. It can just "fizzle" (misfire) causing a spark plug like you have. Don't pull your hair out chasing just a rich condition. If the other 3 plugs are new there is not enough time on them to read yet. If you look at the bottom of the porcelain there might be the start of coloring don there.
Thank you Redwing.. that was indeed the culprit!!!



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