"N8N" wrote in message
oups.com...

ian field wrote:
"N8N" wrote in message
oups.com...

mm wrote:
On Fri, 17 Nov 2006 08:02:47 -0600, "HeyBub"
wrote:

mm wrote:
It seems to me that all the screws and bolts on my Japanese
motorcycle
are metric, except the sparkplugs.

AFAICT, neither the threads nor the socket required for the
sparkplugs
used in my Honda are metric. Is that so, and how did it happen?


Huh? I though ALL sparkplugs were metric - a residual from the days
(~1900)

Well maybe the threads *are* all metric. I wanted to get a nut that
would go on a sparkplug, to make a spark tester, and none of the
English nuts fit. OTOH, I tried all the metric nuts and none of them
fit either. OT3H, they didn't have nuts in all possible metric sizes.
I think HD skipped from 12mm straight to 15mm, so maybe 14 would fit.

I believe almost all sparkplugs are either 14mm or 18mm thread.

Honda frequently use 10 & 12mm plugs for mopeds and lightweight models.

OK, how about "almost all *automotive* sparkplugs." I wasn't thinking
of small equipment applications and don't really know much about them
for that matter. IME the VAST majority of spark plugs are a standard
14mm thread although now you're going to ask me what the pitch is and I
don't know

nate


Somewhere I have a really small spark plug that I drilled the HT stub so it
could be used as a key fob ornament, not sure what size it is but its really
tiny - its for a Honda portable generator.