If the threaded part that screws into the handle is too long, you must recover a thin nut from your old cable on which you have put a saw to dismantle it and reassemble it on the new cable.
This can happen an all the aftermarket cable because they provide the same cable reference to fit for a lot of model.
Fit for XR600R starting from 1988
This cable B is to close the throttle.
If the threaded part that screws into the handle is too long, you must recover a thin nut from your old cable on which you have put a saw to dismantle it and reassemble it on the new cable.
This can happen an all the aftermarket cable because they provide the same cable reference to fit for a lot of model.