Holding in clutch, starts creeping forward

[Privateer]

04 620, 50k miles, Goldline masters.

so today when I got to work as I'm pulling into the garage I notice I can't get any clutch action.  that is, with the lever pulled to the bar, the engine still wants to go forward.  Consequently low speed maneuvers were impossible. 

I dicked around with it at lunch to no effect really.  Figured I'd give it a shot and see what happens.  I noticed the problem only presented itself if i kept the clutch pulled in.  If I just clutch/shift in quick succession everything's fine.

I'd made no changes to the bike between Friday when i last rode, to this morning. 

Got home, flushed out the clutch fluid.  No change.

One thing I did notice, as soon as I pulled the lever a tiny bit, a little fluid spurted into the fluid cup.  I don't know if that's good or bad, but I thought the fluid should be going the other direction.  I adjusted the return screw thing all the way out and no change.  I did notice as soon as I pull the lever the MC piston is immediately being pushed by the lever (again, not sure if that's good or bad, I thought there should be some free play).

It seems to me that I'm losing hydraulic pressure somewhere but I found no leaks or anything else amiss.

any suggestions?

[supperduc]

Sounds like you may have air in the system.

[Privateer]

well I think I found the problem.





you can't see very well in that bottom one, but the orings are destroyed.  The 'inside' one isn't as bad, but the outside one is just demolished.


Anyone know if a 'rebuild' kit can be obtained?  I looked at motowheels, monster parts, and ca cycleworks but didn't see one.  Don't remember where I got the slave from, but my guess is one of those 3. edit: actually I think I got it from desmo times.  checking with them.

[Privateer]

nice.  I've learned evo went out of business a couple months ago.  So I suppose I'm shit out of luck with a beautifully machined clutch slave that is now a beautifully machined paper weight.

One theory I've been told is the only thing that would eat the orings is if the clutch rod spun the piston.  Which means I'm even more screwed.  /sigh

[Ddan]

Motostrano still lists the Evo slave cylinder as in stock, they may have a re-build kit for it:
http://www.motostrano.com/Evoluzione-Ducati-Clutch-Slave-Cylinder-p/9004xx.htm

Same with Desmo Times:
http://www.desmotimes.com/product12.htm

If the rod is spinning check your pressure plate bearing, that's a standard bearing and an easy swap.

[Privateer]

Motostrano still lists the Evo slave cylinder as in stock, they may have a re-build kit for it:
http://www.motostrano.com/Evoluzione-Ducati-Clutch-Slave-Cylinder-p/9004xx.htm

Same with Desmo Times:
http://www.desmotimes.com/product12.htm

If the rod is spinning check your pressure plate bearing, that's a standard bearing and an easy swap.

Actually desmo times is where I bought it and was informed they're out of business and no rebuild kits.  I didn't see it on motostrano, I must've mis-searched.

What confuses me... the evo slave had a bearing in it to counteracts this problem with the rod spinning, yet here I am.  The bearing seems fine, i can spin it with my finger inside the piston... I specifically got that one so I wouldn't have to worry about it.. /sigh

anyone have recommendation for a new slave?  I was considering the oberon, but are the stm/et al that much better?


thanks

[thought]

I like my yoyodyne slave a lot and they have a lifetime guaratee on it... if it ever goes bad, send it back and they will replace it for free.

http://www.yoyodyneti.com/ProductInfo.aspx?productid=D002

[Privateer]

I like my yoyodyne slave a lot and they have a lifetime guaratee on it... if it ever goes bad, send it back and they will replace it for free.

http://www.yoyodyneti.com/ProductInfo.aspx?productid=D002

I've heard anecdotally they leak.  Any experience like that?  By chance do you know the diameter of the piston?

thanks for the tip about the guarantee.. whose lifetime I suppose is the question?

[thought]

I've heard anecdotally they leak.  Any experience like that?  By chance do you know the diameter of the piston?

thanks for the tip about the guarantee.. whose lifetime I suppose is the question?

No leaking so far on my sf.  And not sure about that diameter, I think you'll have to ask that about that.

Haha, and it says it's lifetime of the original buyer.

[Privateer]

Motostrano still lists the Evo slave cylinder as in stock, they may have a re-build kit for it:
http://www.motostrano.com/Evoluzione-Ducati-Clutch-Slave-Cylinder-p/9004xx.htm

Motostrano doesn't have any rebuild kits either.  so I guess it's a new slave.  awesome.

[Ddan]

Motostrano doesn't have any rebuild kits either.  so I guess it's a new slave.  awesome.

You may find that stock o-rings from a hardware store fit

[Privateer]

You may find that stock o-rings from a hardware store fit

I did consider that, but i'm concerned what the chemicals the orings might encounter would do to them.

[Ddan]

I think most o-rings you find easily will be nitrile and brake fluid shouldn't bother them.  It's worth a shot

[Privateer]

anyone have a recommendation for a replacement throwout bearing?  Dealer wants $62.something for a OEM bearing.

Considering the dry clutch bearing is $9 from ca-cycleworks... $65 is a tough pill to swallow.

I can't seem to find them at our vendors.

Any suggestions?

[Howie]

Does the bearing have a manufacturer and part number on it?  If so, it can be matched at a bearing store.