Equivalent to NGK B6ES. Champion N6 Spark Plug. The threads could be cleaned with a fine wire brush. The spark plugs are a very good price to reflect this. The following application list is taken from the NGK online catalogue:-.
High Quality Champion 18mm Spark Plug with 12.7mm reach.
CHAMPION N9YC SPARK PLUG x 6 TRIUMPH GT6 TR5 TR6 2000 2500 VITESSE N9Y
NOS VINTAGE CHAMPION 22 SPARK PLUG 7/8" AMERICAN THREAD INTERNATIONAL,JOHN DEER
Champion N7YC Spark Plug
4x Champion N12YC Spark Plug fits most British makes of Classic Cars
Champion L-86 Spark Plug. In Original Package. Single plug.
