Strip the clutch plates out clean up with a good soak in petrol 24hrs, in a sealed tin an old tupperware box works,dry carefully, and reassembly refer to an exploded parts book to see if someone has missed anything out if any wear is obvious replace the plates if warped or simply worn out,replace but with the type that works in oil or dry, oil is normaly the problem migrating on to the clutch plates , early ones were cork later types were still designed to run dry , not in oil, Ian had some wonderful plates that work in oil or dry, he might be able to point you in the right direction to find some, andrew
Modern steel plates seem to made from metric plate & are thinner than originals so I fit 2 plain plates behind the pressure plate.
Seems to give a cleaner lift as well.
Is it a straight forward enough job to remove the clutch plates so long as I have the 'bolt tool' ? Ive only ever stripped a Bantam clutch :-) Is it worth replacing the spring as a matter of course due to the effects of it shortening over time ?
