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
NGK BPR5ES Spark Plug x10 Code 7422 Equivalent To Bosch WR8DC Champion RN11YC
NGK BPR6ES Spark Plug x10 Code 7822 Equivalent To Bosch WR6D Champion RN9YC
NGK CMR6H Spark Plug x10 Code 3365 Equivalent To Bosch USR4AC Champion RZ7C
NGK BCPR5ES Spark Plug x10 Code 6130 Equivalent To Bosch F8DC0R Champion RC12YC
