Earlier this year I fitted. A brand new 4 spring Triumph type clutch to my dbd. Filled the case with oil, more than usual because I also fitted a Pearson starter kit. For various reasons the bike has not been started for some months but when started yesterday the clutch wouldn't free. When stripped, three pairs of plates were " glued" together, clean metal with no signs of rust. Should I have wiped the plates with oil on assembly? Would it be residue from the manufacturing process? The plain plates were cleaned prior to fitting