The friction plates have a wear limit of 2.7mm thick but should measure 3mm thick when new. These were exactly 3mm, indicating the bike had probably had a new clutch at some time before it went into storage. The springs were a different matter; the correct length should be 36.4mm but, in fact, they were down to the wear limit of 35.4mm. Now, that doesn’t sound like much of a difference, but it is enough to allow the plates to start slipping under hard usage