ok its not the carb, i think i may know what it is, ever since this thread started i have been driving my bike like normal, and now when sitting at a light the bike shudders trying to move forwards a bit, if i pick the back off the ground the tire rotates, i think my clutch is engaging way to low and thats whats making the engine shudder, like on a car if the revs are to low and you disengage the clutch it shudders then speeds up, so i thinkt he clutch is toast,