Not sure where on the site this should fit (possible sticky???). I've seen a fair amount of advice on spark plugs, but they seem to have a bit of randomness to what plugs to use in what carts. Maybe this chart will help to explain what each letter/number actually means and help some folks out on what plug would best suit their situation.
http://www.ngksparkplugs.com/docs/te...tnumberkey.pdf