Question about 2004 Ducati Monster 800

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Signs of a leaking clutch slave?

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.

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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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1 Answer

Clutch just suddenly disappeared and the brake fluid is dripping under the car

it seems like the clutch slave cylinder failed, you have to take your car to the garage for clutch kit and slave cylinder replacement
good luck

Feb 04, 2014 | Motorcycles

1 Answer

I have a Honda VTX 1800C that has been sitting for about 7 months. When I went to pull it out to get it ready to be sold, I noticed the clutch fluid was empty. There was no indication as to leakage on...

Most certainly a leak. This fluid cannot evaporate.
Check from the reservoir, at the lever, the lines(pipes), the connector ends (banjos). Look for signs of "gunk". Wipe with a white clean cloth so help u find. If not there, then the seals on the slave cylinder (engines side) have most likelydeteriorated and will need to be replaced. To check this, remove the cover on the left side of the engine and check for leaks/gunk there.

For a step by step take a look at:

Oct 02, 2013 | Motorcycles

1 Answer

Clutch handle on handle bar has no pressure when i ingage it to release clutch so clutch wont work on my 1998 R 1200 C BMW

I am dealing with this now on my 2001 R1200C. Is there fluid in the clutch slave cylinder? Full? if not then fill it and work the lever quite a few times does the level go down? if so refill it and do it again. Do you see signs of fluid on the ground under the bike just behind the engine basically where the rear swing arm pivots? Mine after a couple reservoirs full showed a few drips on
the floor. If so the Hydraulic slave cylinder is gone and must be replaced. Ok 2
theories here.

#1. you can replace the slave only, flush and bleed the system and ride it
and hope for the best. I would suggest pulling the clutch pressure shaft and making sure there is no wear on the ends that goes into the slave. Mine did and I had to replace it also. or there is

#2. I was informed when the slave goes it pumps the brake fluid into the bell housing where the clutch is. The input shaft to the gearbox is right there and I was informed brake fluid can get on the gearbox input shaft seal and it can soften and eventually it will fail. Then if the gear box grease gets on the new slave cylinder it can cause the seals in it to soften and eventually go out. I personally have talk to 2 people who
replaced the slave and in 20,000 miles had it go again but found the gearbox
seal was also leaking. I opted for number 2 but beware it is an extensive job.
Basically you remove the entire rear of the motorcycle including rear frame, (See photo) swing arm, air box and (well everything from the bar that goes across the bike for the center stand to slip onto) all back from there. I did not feel comfortable doing the gearbox seals so I took it to my local BMW shop and they
are charging 180.00 bucks to replace "all" 8 seals in the gearbox, clean up the sludge all over the gearbox from the brake fluid leaking as well as change the gearbox grease so that it is all handled. I pick it up Tuesday afternoon and it will be ready to install and put all back together.

I was going to go to the slave only thing but to be honest when both of the people I talked to advised me they had a shop do the whole thing after the second failure and it was 2700 bucks. I cant afford that so I decided I would do it. I was also worried if the gearbox seal went and I didnt catch it soon enough I didn\'t want to find out I have some damage done to the gearbox which would just get crazy expensive (I assume).
Hope this helps.

Sep 09, 2011 | 1998 BMW R 1200 C

1 Answer

1989 Honda gold wing 1500 // I am two days into my vacation and am loosing clutch lever resistance and there is fluid under the triple tree. Thane anyone don

Sounds to me like you have a leak in your hydraulic clutch system. Your clutch lever will start to feel odd as (1) fluid leaks out, reducing pressure; and (2) less pressure reaches critical areas because pressure over a certain level is squirting fluid out of the system.

Leaks like these are often caused by one of two things: (1) a hydraulic line that has sprung a leak; or (2) a leaking / cracked fluid reservoir on your clutch slave cylinder. I am discounting the possibility that the slave cylinder itself is going bad, as that wouldn't create fluid leaks external to the system.

To troubleshoot your system, top off the fluid reservoir and then squeeze the clutch lever repeatedly while looking closely to see where fluid may be leaking out. MAKE SURE YOU'RE WEARING GLASSES OR PROTECTIVE GOGGLES WHEN YOU DO THIS!! A pinhole leak in a hydraulic line can shoot out a thin but forceful jet of fluid, and that's really nasty stuff to get into your eyes (it's bad enough on your skin or on the painted surfaces of your bike). The leak won't dribble all the time, only when you're applying pressure, which is why you'll need to keep working the clutch lever while you're looking for leaks. The location of the leak will tell you a lot.

Though I can't see your bike, I'm leaning towards the idea that a hose or, more specifically, the metal end of the hose, is leaking fluid under pressure. If this is the case, you should be able to obtain a replacement hose/line from a Honda dealer and swap it out without too much of a bother. If you're in the middle of nowhere and can't get to a Honda dealer, it's also possible that a hose shop could fabricate a custom line for you if you're able to show them your old hose.

On the other hand, if you have a cracked reservoir, you most likely will have to replace the entire clutch actuating assembly (slave cylinder? clutch cylinder?). That part should be relatively exposed--it may be mounted to the handlebars out in plain view; you won't have to mess with the actual clutch inside the transmission. Because of the location where fuel is puddling, though, I think this is less likely than a hose / hose connection problem.

Good luck, and I hope this doesn't spoil your vacation!

Jul 25, 2011 | 1989 Honda GL 1500 Gold Wing

1 Answer

I have a 1996 suzuki Intruder 800. The clutch has to be bled frequently. It often sits for long periods of time, several weeks. Is this indicative of a leaking slave cylinder? How can I diagnose this?


It sounds to me like you have air getting into the clutch system. Check to make sure all your fasteners are tight and that there is not a bad gasket in the reservoir or slave cylinder.

When bleeding the clutch system, make sure to put a loop in the drain tube above the bleeder valve to prevent air from getting back into the clutch system.

By the way, if your slave cylinder were leaking, you would notice the leak. Take a white paper towel and run along bottom of the slave cylinder area. If it's leaking bad enough to empty the hydraulic fluid (DOT 4) from the clutch reservoir, then it would get air into the clutch system.

Hope this helps. If you find this information useful, please vote on this post. Thank You.



Jan 13, 2011 | 1995 Suzuki VS 800 Intruder

1 Answer

Clutch lever went soft while riding

Check the condition of your clutch master and slave cylinders. You'll probably find you need a new slave cylinder, of course new oil and bleeding, hope this helps.

Mar 17, 2010 | 2001 Suzuki VZ 800 Marauder

1 Answer

Leaking clutch slave cylinder

i would get the rebuild kit from the dealer you can get this as an O.E.M replacement as a kit or you can save some money and order it aftermarket in a kit threw parts unlimited, tucker rocky, or cruiser street, which is great quality and cheaper. it sounds like the rubber o-ring's are warn out, and thats letting the fluid leak, both kits come with the o-rings,piston, the spacer,and the snap-ring. Also you can request the dealer to print off you a "exploded view" of the slave cylinder to help replace all of the parts yourself.

Jun 21, 2009 | 2004 kawasaki VN 1600 Mean Streak

1 Answer

Clutch slip

You may have a leaking slave cylinder - it has leaked brake fluid on the clutch plates.
Certainly at 14K that would be the only thing I can think of - normally the clutch is good for 60K Miles or more.

Mar 16, 2009 | 2002 BMW K 1200 RS

1 Answer


Check to make sure the slave and master cylinders are working. You can probably bleed it if the slave cylinder started leaking. Could possibly be internal on the clutch master.

Mar 06, 2009 | 1988 Honda VF 750 C Super magna

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