Don't try to ride it, you can do very expensive damage.
You will have to rebuild the waterpump at the same time most likely if it hasn't been done so prepare yourself for that too....
Think about what will happen if the bearing fails completely, think about metal in your oil and about your roller bearing crank.
You are paying, this is, the price of KTM 640 ownership.
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing
The faster it goes the faster it breaks.
And high performance=high maintenance.