What is a NGK application chart?

The NGK application chart lists the types of spark plugs that different vehicles, generators or other pieces of gasoline-powered equipment use. The chart lists the model and stock numbers for NGK spark plugs used in machines from many different manufacturers.

For many applications, NGK manufactures spark plugs in multiple variants. The NGK application chart lists the model and stock numbers not only for the standard spark plug that machine uses, but also the model and stock numbers of that model's variants. Spark plug variants NGK makes include economy models, high performance spark plugs, spark plugs designed for increased longevity and heavy-duty spark plugs for racing applications.