Springs get hot and tired over the miles of riding and LOSE TENSION which promotes clutch slip.
If you are going to replace friction plates alone ALWAYS change to EBC 15% uprated chrome alloy springs to get the tension back where it sould be.
Image is for illustration only.
NOTE- IN SOME CASES YOU MAY END UP WITH 1 OR 2 EXTRA SPRINGS - THIS IS DUE TO SOME BIKES USING THE SAME SPRINGS BUT IN DIFFERENT AMOUNTS.