I recently bought a new clutch slave cylinder from MPL in Germany... a nicely made piece at a great price and it's red to match my ride. So I install it, bleed it and go for a ride. Into gear, let out the clutch, give it some gas and.....nothing. Clutch slips like crazy and the bike just revs and doesn't move. Remove, check out, find no problems, reinstall and get the same result. So I then reinstalled the stock cylinder as I was leaving the next morning for a few days riding in North Carolina and I was panicked about having a non-functional Duc. Stock cylinder works just fine, just as it had before I removed it. When I returned from N.C. I contacted MPL and they say add another 2mm plain clutch plate to make the clutch pack thicker and that will fix the problem. I am annoyed. First off where do I get just ONE plain clutch plate? Second why does the stock cylinder work fine with the current clutch pack if it's too thin as MPL is telling me? Third has anyone ever had a problem with an after market cylinder causing the clutch to slip? The bright side is the bike ran great in N.C. and the roads are just as fantastic as they were the last time I was there. The less bright side is I am now back in Chicago where the roads are.....less amusing. Oh, and I have a red slave cylinder that doesn't function.