•100% ORIGINAL NGK
•What do the numbers mean on NGK Spark Plug?
•Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how 'hot' or 'cold' a spark plug is. ... This means the spark plug will heat up easily and reach its optimal operating temperature.
•How do you read a NGK Spark Plug code?
•The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. There are three spark plug thread sizes currently being used in motorcycles and ATVs. “B” indicates a 14 mm x 1.25 pitch size, “D” indicates a 12 mm x 1.25 size and “C” indicates a 10 mm x 1.0 size.