Question about 2004 Ducati Monster 800
The last time my clutch slave went out on me I think it was rather sudden. I was scooting around surface streets and the clutch pull started feeling funny loose. Then after that it suddenly lost all resistance and the bike died while stopped at a light. Recently I have been noticing that the clutch pull isn't going all the way and is stiff at times. I can usually pull all the way to the bar but all of yesterday clutch pull felt a bit stiff and I couldn't pull all the way to the bar. The bike would also pull a lot in first w/ the clutch pulled in. In the previous week it's been on and off but it was happening all day yesterday. Now, when I went out to the bike to try today, it pulls just fine. I recently had the clutch hub nut come loose but I tightened that up and that is not the problem this time. I pulled the clutch plates and saw nothing glaringly wrong. I pulled the slave (Yoyodyne) and noticed some black liquid dribble out of the clutch slave. Wiped it up and a few minutes later a little more dribbled out. The consistency is very watery but has a bit of a film to it. I'm thinking it might be leaking brake fluid. I recently (when the clutch hub nut came loose ~2 weeks ago) replaced the little O-ring that goes around the push rod between the engine case and the slave. I vaguely remember black liquid dribbling out of the clutch slave then too but didn't think anything about it. Think this is a sign of a leaking slave? If not, what else do you think it is? edit: got around to dismantling and trouble shooting. This is what I found: The was rust around the 2 holes at the bottom the master cylinder as well as a bunch of sludge stuck in the valleys along the 2 long sides of the coffin. I emptied out the coffin and cleaned that up. Hopefully it should last me a bit longer and then I'll upgrade later. As for the Yoyodyne, I popped it open and it spit out strips of silicon Huh? I'm not sure what it was but it came from between the piston and the outer plate. Also the outermost O-ring on the piston (big one on the left) was very distended and there was a bit of black goop mixed up lubricant that I found in the slave housing. I couldn't get my pill out to examine it but it doesn't look too bad. Did I mention that there were gold flakes in the dirty brake fluid that was leaking out of the slave? Hopefully all I have left to do is get Yoyodyne to replace it under warranty. Hope that's not too much trouble. Conclusion: So to wrap things up: Yoyodyne received my clutch slave and is sending me replacement bits under warranty. waytogo I really lucked out in that the older monsters need an extender pill between the pushrod and the piston. The pushrod destroyed this and saved me from drilling a hole through the piston w/ my push rod. On top of that they suspect that the O-ring around the pushrod between the slave and the engine broke and let oil into the slave which contributed to the failure of the O-rings on the slave. I can verify this by the fact that the O-ring in question was totally destroyed when I last popped the slave off a couple months ago when my clutch hub nut came loose and I had taken everything apart to inspect. So, if all goes well I'll get my return bits by Friday and can put the bike back together this weekend. Then it's Grin time! I've missed riding so much these last 2 weeks.
A leaky slave would be more likely to give a soft lever. What you're describing sound more like a problem with the return bleed in the master. Have you made any adjustments recently?
Posted on Nov 20, 2008
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