Now say “Aaaaaaahh…
Sources:http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp** Tongue Problemshttp://www.embarrassingproblems.com/problem/tongue-problemsYou could also try...http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htmhttp://www.gnttype.org/techarea/engine/plugs.html
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