I was just recently riding and my bike was running fine. I stopped at a stop light and when to take off and the bike started to jerk when I let fully out of the clutch(Not from releasing the clutch to fast) and it started to pop from about 4k-6k rpms and then it would go just fine and I would go to shift and it would do it no matter what gear I was in. I tried adjusting the clutch cable and that didnt help any. I was doing some reading on the form and im starting to guess it is my plugs. The bike is an 03' 600RR with 40k miles on it and im pretty sure the plug havent been changed on it for about 25k miles. Also no engine lights have come on.