Penner has greatly limited the conditions where closed loop is active where the ECU is using signals from the O2 sensor: 1000 rpm and less up to 35.7% throttle and below 2.4% throttle up to 4300 rpm. You probably wouldn’t notice it if you disabled the sensor.Thanx for that....the bike runs real well...i didnt do the 12 min tune the first time i loaded it but have since reloaded it and gave it the 12 mins after the fan came on...simply because the 02 sensor is still connected...i will ride her again today.....just over thinking maybe but i can now put it out of my mind...thanx again.