Thanks Charlie,
I rebuilt (completely) and tuned my carbs about 6 weks ago, when I set the
emmissions to about 3.5 percent, I wouldn't expect the settings to have moved
too much since then, besides I'm experiencing some pinking which I understood
to be a symptom of a weak mixture!
Yes there was a worn spot at the point of arcing, so I guess I'll put it down
to bad luck and forget about it.
Chris.
> Anytime you have black smoke coming from the exhaust, you're running too
> rich, whether it's from a foul single cylinder or from a bad tune on the
> carbs or engine. If you weren't having a black smoke problem until you
> noticed this problem, chances are a bad plug wire is the problem. Was there a
> rubbed spot on the wire that could have reduced the insulating qualities in
> that particular area? A quick replacement of the questionable wire will
> answer all. Do you still have the wires from the last replacement, or any
> length secondary wire that will temporarily fill the bill?
>
> It could have been a defective wire coming off the shelf. Simple rubber will
> deteriorate just sitting there on the shelf. Even the silicone insulation
> used in modern wires will fail if damaged during packing, shipping, or
> installation. High tension voltage, like water, will seek the path of least
> resistance. If there were a weak, or worn area, voltage will find an
> alternate ground.
>
> Could something else be causing a quick breakdown? Not likely in that short a
> run. Like I said before, grease, oil, and high temps are the cause for an
> early demise. My advice, swap out the wire(s), consider it a fluke, and go on
> with life (but, check for that worn spot!)
--
-- 1977 Spitfire 1500...Everyday/Only Driver.
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