CHAMPION, COPPER PLUS SPARK PLUG. N12YC Big Twin 1975-99 (2)

H-D 5R6A. 14mm threaded, long reach. Used with a 21mm spark plug socket. Copper-core center electrode. Spark plug comes with the patented Ultraseal™ coated shell, to help keep the spark plug body corrosion free and better looking for a longer period of time.

Fits: > L78-E82 FL; L78-79 FX; 84-99 Big Twin (Excl. Twin Cam); 75-E78 FL, FX 

Set of 2