Reply To: Miss and backfire under 5k only after engine warms up – 2009 GT650R
New stator will be needed now and regulator in tandem (all part of the ignition system as is the frame mounted coils)
Do you have a picture of your current coil? (i will tell you if you’re OK based on the picture of the coil) but with the weird running issues apart from the fixed injectors, the ignition parts may be your next enemies (coil may work then acts intermitently once you ride for a little bit, no way to measure it while riding if its flactuating)
I can attest to the fact that I had fixed customer bikes with OEM stators intact but damn , they starting causing all kinds of issues once the bike ran up to temps (yes its charging but the pickup coil was making a mess of the ECU and ignition coils)
Also consider Shingden upgrade (DO NOT buy an OEM or Aliexpress regulator, you will regret it very quickly! , many riders online can attest to this fact) , something simlar to this below will set you for life.
Upgrade Regulator Rectifier & Stator Generator – GV650 GT650 Hyosung {Carby & EFi up to 2013}