Reply To: Miss and backfire under 5k only after engine warms up – 2009 GT650R Forums 🚥 PiT STOP 🔧 Hyosung Technical Help Miss and backfire under 5k only after engine warms up – 2009 GT650R Reply To: Miss and backfire under 5k only after engine warms up – 2009 GT650R Feb 6, 2025 at 5:57 PM #18832 Mark de RooyMember Topics: 5Replies: 64 I took it out again and it seems like it is running almost perfectly above 5k revs. Is this something the ECU can do or ignition timing?
