Rotary 13020. Autolite Xtream Start Iridium Spark Plug XST2974DP. CJ6Y, CJ7Y, BPM6A, BPM7A & 2974. Carded. min 10. 0.6mm finewire design offers exceptional fouling resistance. Iridium center electrode lasts longer than a conventional center electrode to maintain optim