i bought an 87 fzr 1000 a couple weeks ago wd a clutch problem,.. it doesnt disengage.. wenever i shift it in a first gear it just jerk and the engine just dies.. but i tried to push d bike while pulling the clutch in den shift it in first gear and it did work.. some says it could be the clutch plate or just change the fluid.. any other suggestion and idea that can help me??