NGK Racing Spark Plug for KTM Suzuki 125cc (R6918B 8) K Type Levers the Maxxis Bighorn 2 K 225687 the Maxxis Bighorn 2 690 ENDURO R 12 18 ZE56 6810 19 22 ZE56 6820 690 SMC R 12 18 ZE56 6810 19 22 ZE56 6820 790 ADV 19 22 ZE56 6820 790 ADV R 19 22 ZE56 6820 890 ADV 21 22 ZE56 6820 890 ADV R 21 22 ZE56 6820 1090 ADV 17 18 ZE56 6820 1090 ADV R 17 19 ZE56 6820 1190 ADV 14 16 ZE56 6820 1190 ADV R 14 16 ZE56 6820 1290 S ADV R 17 22 ZE56 6820 1290 S ADV S 17 20 ZE56 6820 HUSQVARNA To withstand the severe conditions that occur in racing engines NGK Racing Spark Plugs feature electrode materials and configurations as follows: Electrode materials Many use precious metals such as platinum or gold palladium for greater durability and lower voltage requirements