Reply To: Spark plug type – GV125 S EFi Apr 21, 2024 at 4:19 PM #13035 Northman👤 Member Topics: 5Replies: 12Country: SpainBike Model: GV125s What’s wrong with the Iridium IX? it’s because of OEM wiring? One of my friends has the iridium IX on his yamaha and hasn’t changed them in 40,000km, they work perfectly