Well....here I am looking for a little expertise to help me diagnose a Cylinder #1 Misfire on a 2002 R50. I can get it to redline in any gear if I feed it gas slowly. If I give it any significant throttle it starts to misfire. If I back off quickly when it starts the DME can recover and adjust the timing and mixture, without issue, but If I keep the throttle down it will Flash the CEL light, lite the DSC light and continue to run rough until I turn it off and start it again which resets the DME Computer.

New Plugs, Tested Wires, New Cam Position Sensor, New Fuel Filter (WOW Dirty). I'm kinda thinking there is dirt in my injectors which are original (127K Miles). It was doing this prior to a filter change but man was there a significant amount of dirt in that filter. I tried to clean it out as best as I could but maybe not god enough for the injectors.

I gave her a dose of sea form to clean up any carbon, but I cant image carbon or a burned valve when there is no problem on slow application of the throttle.

 

Have you looked at the throttle body? Inside the air intake? You mentioned changing the fuel filter, but not the air filter.