NGK IRIDIUM IX SPARK PLUGS x 4 FIT YAMAHA YZF-R1 1000cc 2/1998-2008
YAMAHA YZF-R1 1000cc FROM 2/1998-2008. Genuine NGK Iridium IX Spark Plugs. - Fine Iridium tip ensures high durability and a consistently stable spark. NGK PART NUMBER: CR9EIX. (Heat Grade 9). - Heat grade 9.