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Spark plug charts
Originally posted by @supamodel
Mainly to save me looking up cross-references for spark plugs, here are some park plug charts.
Note NGK heat ranges are reversed from other manufacturers. If your plug is burning up and falling apart, you need to go a larger number in NGK and a smaller number with other manufacturers. Likewise, if you're fouling plugs, then you need to go a smaller number in NGK or a bigger number with other manufacturers.
(from http://www.bosch.com.au/content/language1/downloads/a_sect_spark.pdf, page 9)
(redrawn after http://www.gsparkplug.com/shop/media/images/extras/code_champion.pdf)