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April 3rd, 2012, 02:02 PM   #1
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Clutch Slave Cylinder O-Ring

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
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April 3rd, 2012, 05:33 PM   #2
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Re: Clutch Slave Cylinder O-Ring

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?
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April 3rd, 2012, 06:30 PM   #3
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Re: Clutch Slave Cylinder O-Ring

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/
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April 3rd, 2012, 07:58 PM   #4
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Re: Clutch Slave Cylinder 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.
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April 4th, 2012, 06:09 AM   #5
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Re: Clutch Slave Cylinder O-Ring

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.
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April 4th, 2012, 04:19 PM   #6
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Re: Clutch Slave Cylinder O-Ring

This is the closest that I could find to match mine.

http://simplybearings.co.uk/shop/produc ... _id=512604
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April 5th, 2012, 12:49 AM   #7
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Re: Clutch Slave Cylinder O-Ring

it is the same O ring as the cam end cap has (2)

taffy
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April 6th, 2012, 09:01 AM   #8
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Re: Clutch Slave Cylinder O-Ring

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.
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April 6th, 2012, 09:49 AM   #9
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Re: Clutch Slave Cylinder O-Ring

Can you post a picture of your Berg setup CrazyTed?
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April 7th, 2012, 02:00 PM   #10
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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
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