Been fighting this since March. Several prior posts with good responses but here is a quick recap and status. March 2010, running fine but had fuel pump module changed under warranty for low fuel light. Picked up bike and noted exhaust pipes gray inside instead of usual black. Ran fine but dealer said there is problem. Under warranty the took apart top end and ruled out damage. Said Stage One Download no longer is proper map so sold me super tuner. Ran poorly since, multiple re tunes, replaced injectors, crank sensor, map sensor etc. Sit at red light then proceed with light throttle roll and it will jerk and stumble but not all the time. Running slow 15 to 20 it is jerky and sometimes very jerky and missing. Hard acceleration off the line etc is strong and smooth, runs great all the time if running hard. Here is what I now believe is occurring. Engine is going into Heat Mode very early. I can hear the idle reduce when stopped which is the first stage in heat mode. Does this after lets say 5-10 seconds of sitting. Ambient temp 85 to 90. If I sit for more than lets say 30 to 70 seconds it will stumble when accelerate slowly. I believe it is going into further stages of heat mode and causing they symptoms. At slow speeds and idle the O2 sensors are activated and running in a lean mode, Also cylinder head heat sensor is monitoring heat. I believe that it is actually running hot or something is sending missinformation to the ecu. O2 sensors had same white/brown build up that the spark plugs had back in March. (mechanic did not pull them as I requested so I did last weekend) It was rather thick instead of a simple dusting. I cleaned them with brass bursh and used non Clorine Brake part cleaner to shoot through the vents, though doubt it did any good or harm. Sensors are relatively inexpensive so I ordered new ones so that I can rule them out. If this makes no difference then I will do the Heat Sensor.(both of these items on my dime, not telling dealer unless I fix it) If that is not issue then will give Orlando HD one more crack at tune then will get money back from tuner and they will swap out the ECU and I will give them the tuner back and will go to Doc Weaver and get the TTS tune done. Dealer did agree to refund if they cant get it right. Any thoughts on my analysis and plan?