Reply To: Miss and backfire under 5k only after engine warms up – 2009 GT650R Feb 15, 2025 at 3:21 AM #18913 Mark de Rooy👤 Member🖊 Topic Author Topics: 5Replies: 64 Ok peeps, I took her out this morning. It has no power and using a lot of fuel. Engine is running smooth, no backfiring. Plus will stall under 2k revs.