Świeca zapłonowa Champion Copper Plus. J12YC

H-D 3-4. 14mm threaded; 1/2″ (12.7mm) short reach. Used with 21mm spark plug socket. Copper-core center electrode. Spark plug comes with the patented UltrasealT coated shell; to help keep the spark plug body corrosion free and better looking for a longer period of time.