>Problem with this is that one spark plug the center electrode is
>positively charged, the other negative.  Forget which way is
>preferred, but one of the plugs wears out faster in the dual
>firing/single trigger setup.
That's why some motorcycle manuals suggested swapping the plugs
every X 1000 miles. (eg old Honda 4's). I don't have that problem
with the Harley though. By the way, it still has the spark advance as
a twist grip on the handle bars :-)

Tony


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