Clutch Slave Cylinder O-Ring

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SuperMotoMike

Joined
Aug 20, 2007
Messages
202
Location
Maryland - USA
Anyone know what size o-ring I need to rebuild my clutch slave cylinder? The parts book only has it with the piston for $42. I'm sure all I need is a couple dollar o-ring.

Thanks,

Mike
 
Yeah, Husaberg isn't very helpful. They want you to buy the whole doggone slave cylinder. Best thing I can think of is to take it apart and take the o-ring to a specialty shop that has a broad selection.

But before you go to all that trouble, why do you think that the o-ring on the clutch slave cylinder piston needs to be changed? Have you tried a good bottom-up bleed?
 
KTM doesn't make a rebuild kit for the slave either, you have to buy the entire thing. I just replaced the o-ring in the clutch slave cylinder on my '07 450 xc-w. I dremmeled out and then buffed the inside of the slave to remove the groove where the leak was happening. There are two o-rings you can use for the KTM, one stock size and one over sized. I chose the oversized one because of the material I removed. Neither of the o-rings are for the clutch but work fine. Maybe the same o-rings will work for the Berg.

Clutch Slave Cylinder O-Ring 23.52 X 1.78 mm .......................KTM P/N 770020210
Clutch Slave Cylinder O-Ring 23.52 X 1.78 mm McMaster-car
Clutch Slave Cylinder O-Ring (oversize) 23.00 X 2.00 mm .........KTM P/N 770230020
Clutch Slave Cylinder O-Ring (oversize) 23.00 X 2.00 mm ........ McMaster-car P/N 9263K502

Here is where I got the info:

http://www.thumpertalk.com/topic/730560 ... er-o-ring/
 
Where were you guys when I needed you 3 weeks ago? I went the path of least resistance and bought a replacement slave. The good news is, problem solved which I am happy about.
 
Thanks for the info guys! I'm not sure if I need to replace the o-ring yet but I want to have it on hand if bleeding the clutch doesn't do the job.
 
I ditched the wimpy KTM designed piston and o-ring setup and went with the unit from www.KTMTwins.com . They import an aftermarket slave from Europe. It has a thicker piston and two o-rings so the piston can't rock in the bore. I have destroyed two different slaves, one on a KTM and one on my Berg. No more problems with the aftermarket unit.
 
Re: Clutch??

I did a bottom up bleed on my clutch and I'm sure I've got all of the air out. The last time I put 20ml of mineral oil through it and not a single air bubble. The lever feels good but when I put it in gear and try to push it the rear tire just drags. I took the small clutch cover off and can see it disengage when I pull the lever but not very much, maybe a couple of millimeters. There is no signs of leaking at the slave cylinder or anywhere else. I don't know what to do next...HELP! BTW, it's a factory slipper clutch if that makes a difference.

Thanks,

Mike
 
I made the same mistake, but made it a different way. After bleeding my clutch system with the bike on a work stand, I started it up. The rear wheel spun with the transmission in neutral. "Holy cow!" I thought. "I've boogered this thing up!"

Nope, I didn't. The amount of movment at the slave cylinder is really tiny, for one thing. These bikes tend to have a lot of clutch drag for another, especially when the motor oil is cold. REALLY especially when the bike is new and the motor oil is cold. Turns out I just needed to let the bike warm up, and doggone if I didn't have a fully functioning clutch system.
 
took mine to a hydrolic shop and they had a ring that worked and it cost me .15 :cheers:
 
I'm dealing with the slave leaking now. They want 150 bucks for a new one. It is probably just the o-ring. Hey Taffy is that part number for an o-ring that will work on the 09 570 berg?
 
If you're going to replace the clutch slave cylinder, don't buy the factory part. You have already run that experiment and you know the outcome. There's an aftermarket source that has a 2 O-ring and 3 O-ring solution. Somebody post the source. I've forgotten.
 
What others have done? Right now the shop says 180 dollar retail is my option for the same slave that with obviously fail again.
 

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