I have a 96 xcr 600 with bad water pump. Question is can I use a water pump from later models 700 and 800's. Same Unit except the 96's had oil fill. I have one off a 98 xcr 700 on it now and it works but does it need oil or will it recieve lubrication from engine lower end?? I don't know if they changed the lower end between 96 and 97??