Miata Mailing List: November 1993, Message #166
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   From: Mike Rother 
Subject: New Sparkplugs
   Date: Sun, 21 Nov 1993 21:11:44 -0500


It's time to replace my Miata's original sparkplugs.  Not interested in
SplitFire or platinum plugs.  I have a question about NGK's.

Shop manual notes that NGK  BKR6E-11  plugs are standard equipment for
the manual transmission car.  However, the shop manual also lists the 
BKR5E-11 and BKR7E-11 as options.  What is the difference?  Colder &
hotter?  Which is which?  Which is better?

I've bumped my timing up to 14 deg BTDC and run 89 octane gas.  I don't
drive the Miata in the winter.  Would one of these other-option plug
numbers perhaps be better or worse than the original for my fuel/timing
setup?

Finally, any sage advice on pulling & reinstalling plugs in those
d-e-e-p holes?