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If its not slipping I wouldn't touch the plates,if it is slipping and the fiber plates are worn the cheapest easiest fix is often to add one extra steel plate.
Also running ATF in the gearbox can...

A bit of clutch drag is pretty normal on older bikes, have a look at the fingers of the basket. The fiber plates tend to hammer into the basket making slight notches, this is enough to make them...

DONT DO IT!

Fix what needs fixing and use it or restore to original and use it.