spring either broke or came out.. you gotta take the clutchcover off to fix it and if it broke then you possibly ground it up into little peices and thats not good for your bearings but the sooner you get cover off and check it the better. if its bent out of the hole it goes in you can try bending it back and fitting it back in but chances are if it is bent out you will want to get a new one. cheapcycleparts.com has them i think 8 dollors.