Reply To: Miss and backfire under 5k only after engine warms up – 2009 GT650R
If you unscrew the HT wires away from the coil so it is by itself (Yes the actual HT wire should be unscrewed so the cone has no wire attached to it)
Tell us again the primary and secondary resistance of each coil
Eg. Coil Front
– 0.6 Ohm (less than a single ohm)
– 12,000 ohms (12.K)
We can match those with the service manual if its in spec or not. It helps to get a picture of the coils on the bike, Hyosung used variations of coils until they settled with a Delphi Shotgun coil after 2013+.