When the clutch on your motorcycle starts to slip it will need replacing and also the
clutch springs will need replacing.
The best way to do this is with the EBC complete streetbike clutch rebuild kit SRC series or the new
SRK complete rebuild kit which has the extra steel plates included.
The friction plates in both the SRC and SRK Kits are lined with a Kevlar fibre impregnated lining that grips and last longer than standard cork based plates.
The SRC and SRK clutches do "Take up" more quickly than Cork plates and you are advised to acquaint yourself with the new feel of the clutch before returning the bike to highway use.
Use correct grades of transmission oil as recommended by the manufacturer and never reduce viscosity or quantity of lube outside the handbook spec.
Replacement of a clutch is a job for a professional mechanic, do not attempt such work unless you are qualified.