I've been buying and selling a few spares over the last year or so, keeping what I need to build my 900SS Mongrel I'm in the middle of, whilst also maintaining and tinkering with my M900. I've ended up with several Clutch slave cylinders, and am almost at the point of deciding which one to fit to the SS. Stupidly, being new to Ducatis several years ago, having been a Kawasaki man before, I've never used a standard Ducati Clutch slave Cylinder as fitted to the 90's Monsters and SS's, as my M900 came to me with what I believe is an Oberon cylinder already fitted. I've got a choice of these three to use on the SS: Ducati Performance. Factory Racing A std one which could be 851, 888, or 916, I don't know as it came with a load of other parts I purchased for those 3 models. I know I might have to turn up a small slug to adapt the length of the push rod, and am going to use the Carbie 600SS Master cylinder I already have. So, can anyone give me the benefit of experience comparing the three of them? I'm assuming it will be a choice of either of the first two, but you guys might disagree. Ta Nasher.
I think the DP one is 28mm. It's really a personal choice thing I'm afraid and depends on how you ride and where. Bigger pistons give you lighter pull but at the expense of longer travel and vice versa. If you're gonna use it as a sports bike you may favour a short and fast pull and not worry too much about the weight, if you're in heavy slow traffic all the time you might want a lighter slower pull. It's a quick job to swap them so why not taste all three and see which one tastes best?
If the current one fitted (Oberon?) works ok then I would say leave that on the bike, you wont gain anything fitting the DP one as piston size will be the same as the oberon. Come to think of it, if it is an Oberon the piston may well be 29mm so a lighter pull on the lever to engage.
I've got either Oberon or Cnc slaves fitted to the street fighter 1098s and the evo 848 so dry and wet clutch comparison and I've been lucky as not had the problem with locating neutral.
You might not have to seeing as an after market job is already fitted it should already have the slug. I measured the one that came with my Oberon, its Length is 10mm with an 8mm diameter.
CS, as per the post I'm not thinking of changing the Oberon one on my M900, but trying to decide which of the other three I have to use on my 900SS Project. I've had a bit of a play around with it today, unfortunately I don't have a master cylinder ready to go yet, but did have a better look at the three Slave cylinders and how they fitted the bike. I have two push rods, one which I think is 600SS and another which is much shorter and came with the box of 851/888/916 spares I brought. The short one is too short, it would disappear inside the cases and leave nothing to push on. The longer one appears roughly right though. What surprised me is that the Ducati Performance Slave Cylinder appears to have a light spring behind the piston that keeps it pushed out. The Factory Racing and standard ones are as I expected, in that once the piston has been pushed back into the body it stays there. Both were a little reluctant to move at first, whereas the Ducati Performance slides in and out very easily with light pressure between finger and thumb. This of course means that there will always be slight pressure on the end of the pushrod, but it doesn't appear to be anywhere near enough to operate the clutch at all. I'd imagine though it may have a consequence with regard to wear at the clutch end of the rod. Has anyone used one of these and noted the constant spring pressure? With the longer pushrod in place the DP Slave Cylinder is almost touching the engine when the pushrod bottoms out, and remember that’s with the piston in it’s ‘out’ position, so if I use it I’ll need to turn a little slug up to extend the pushrod, or I’ll more likely get a length of Silver steel and make a new rod the right length by cutting o ring grooves and shaping the end in my lathe. Nasher
No harm in short pieces give multiple points to wear and reduces the wear at any one point a problem asuming no differential rotation can occur at all joints simultaneously a ball is good as well point contact and low friction, anyway will work, remember some grease? on ends
Yep, agree with that, I used a Ball bearing in the Slave Cylinder hole to add just a little bit of length to the push rod on my old Z1000 when I converted it to Hydraulic clutch with GPX750 Master and Slave Cylinders. I think you are probably right, although it came with a mixed load of spares which were all 851, 888 and 916. I'm interested to hear from anyone who has used the Ducati Performance Slave Cylinder in the past, and if the light spring preload caused any issues. I'm thinking that once the system is closed and full of fluid the spring won't have any effect anyway. Nasher
As an aside, can anyone confirm, or identify any differently, that the Slave cylinder fitted to my M900 shown in my first image in post 1 is Oberon? When I brought the bike with it already fitted I’m sure I was told it was Oberon, but having now spend a while over the last few days researching different Slave cylinders I haven’t seen any images that show that distinctive design. I’d have thought that even if was an old design I’d have seen an image at some point. Thanks Nasher.
I finally found the manufacturer of the Slave Cylinder fitted to my M900: PureTEC http://www.ducati-kaemna.com/catalo...erformance-parts-kupplungsnehmerzylinder.html Nasher
Yeah I have one fitted on a 999S, hadn't noticed any problems but then I don't use the clutch much anyway
