Oberon Slave Cylinder

[sactomonster]

I installed an Oberon slave cylinder on my 1994 M900 and for some reason it will not fully disengage my clutch. I used the extension piece that is supplied for pre-2000 bikes and it is still not pushing the rod out far enough.  Do I need to replace the master cylinder? I have not noticed any leaks and there are no air bubbles when I bled the system (10 times!!).  Also, would the lack of clutch disengagement prevent the bike from starting?  I have a brand new battery and have power to everything, it just won't kick over.  Any help would be great. --Steve

[Porsche Monkey]

Welcome to the forum.  You may have better luck with this over in the tech section.  I am not familiar with the Oberon slave so I can't offer any advise.  Not sure why it's not starting.  Clutch disengagement should have nothing to do with it if the bike is in nuetral.

[sactomonster]

I figured it wouldn't affect starting.  Thanks for the reply.

[sactomonster]

I installed an Oberon slave cylinder on my 1994 M900 and for some reason it will not fully disengage my clutch. I used the extension piece that is supplied for pre-2000 bikes and it is still not pushing the rod out far enough.  Do I need to replace the master cylinder? I have not noticed any leaks and there are no air bubbles when I bled the system (10 times!!).  Also, would the lack of clutch disengagement prevent the bike from starting?  I have a brand new battery and have power to everything, it just won't kick over.  Any help would be great. --Steve

[Capo]

I would recommend that you take of the pressure plate, remove the plates and inspect the basket and plate tabs for wear, dress up any burrs with a file. Next check the bearing in the pressure plate. Ensure that the clutch hub is tight on the shaft. Check that the push rod is free to slide right to left. Reassemble the clutch and check how much the rod protrudes from the crankcase on the slave side, fit the slave then and check again ensuring that your clutch lever is correctly adjusted and that the hydraulics are free from air.

Ducati redesigned the clutch slave cylinder to solve issues with leaks, this redesign necessitated a longer push rod, all after market slaves are based on this design and require the longer push rods.

Others more knowledgeable then I could tell you the the year the change took place and the lengths of the rods.

[erkishhorde]

I have a '95 m900 and got a yoyodyne slave. I also had the use a pill (supplied by them). I've always had an issue with clutch stack height and could never put in the "stock" height. I've always been finessing the stack height and taking out a steel here or swapping out a thicker steel from my old stack for a thinner steel in my new stack. After I changed my slave I had to re-adjust my stack height.

If you replaced your old slave due to a leaky slave there could have been a cause other than wear and tear. I would make sure that your throw out bearing (round thing in the middle of the pressure plate) spins freely as stated by Capo.

After that I would try adjusting the stack height. If the clutch isn't fully disengaging you could take out a steel or two. Just make sure you alternate steel/friction and end up with a steel on the inside and a steel on the outside.

[sactomonster]

Thank you for all of the replies.  I figured out that it was a bunch of water that got into the open clutch.  It made some plates stick together preventing full disengagement.

[Oldfisti]

Glad to hear you got it all sorted out.      Welcome to the forum!