You are right the lower the number the hotter the plug.

I'd guess that 99+% of the list is using NGK plugs, but it may still be worth noting that the
numbering strategy is completely different for each manufacturer. Champion, for example, runs
opposite NGK, i.e.: lower number Champions are colder. The info should be readily available in
each maker's catalog (or website).

Jonathan Lauter
Rotary Power Marine Corporation
516-656-5685
www.rotarypowermarine.com

 
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