NGK, spark plug BPR4ES-11 1 step hotter: 84-99 Evo Big Twin models 75-E82 FL Shovel 75-E78 FX Shovel (NU)

One step hotter than OEM 5R6A. NGK copper core V-Power spark plugs feature a specially designed v-groove center electrode improving ignitability and reducing quenching. The 98% pure copper core delivers increased heat dissipation for more reliable starts and reduced risk of overheating. - Cold-rolled threads prevent cross-threading and damage to cylinder heads. - Trivalent plating eliminates need for anti-seize. - High-grade alumina silicate ceramic. 1 step hotter: 84-99 Evo Big Twin models 75-E82 FL Shovel 75-E78 FX Shovel (NU)