I just bought a 650 nighthawk and I cannot see anyplace where you can adjust the cam chain. Is this internal and not needed now or?? Seems to make some rattling noises right where the cam chain would be. The bike has just under 18.000 miles and looks like it came off the showroom floor so I know the guy took good care of it. Just have that noise that bugs me. Thanks for any help you can give.