I have read many posts with similar conditions...yet haven't found what you guys did to remedy the situation. Here is whats going on. 2003 CBR600RR with only 6,XXX miles, no mods. Bought two months ago. I have ran it pretty hard, and about a month ago it surged on me just for a brief few minutes. Rode a total of 180 miles that day and no issues. Since then, ran a lot, no issues until two days ago. Bike started surging real bad, almost lunging back and fourth. About a 20 mile ride home, and in that 20 miles, bike wouldn't go above 70mph. Then, while still surging, wouldn't go above 40 or 50mph. On the last few miles of my trip home, bike seemed to 'back itself down' as I tried to give it throttle, and wouldn't go over 30mph. Limped it home. What gives? Spark plugs or clogged fuel filter? Please help!