Suzuki - NGK CPR6EA-9 Spark Plug - See Description for Engine Models - 09482-00L04. Suzuki NGK CPR6EA-9 spark plug for Suzuki outboard engines.. This Suzuki NGK spark plug fits the following engine models:. DF 4 S/N 110001 & Newer. DF 6 S/N 110001 & Newer. DF 9.9 S/N 110001 & Newer. DF 9.9B All Model Years. DF 15 S/N 110001 & Newer. DF 15A All Model Years. DF 20A All Model Years. DF 25A All Model Years. DF 30A All Model Years