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Old 09-08-2013, 03:44 AM   #1
KTM Deano OP
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Oberon clutch slave cylinder - Is it worth adding to my 990 Adventure?

I've taken a look at the few modifications that people have made to their 990 Adventures and the Oberon clutch slave cylinder seems popular. My bike is only a couple of weeks old and I'm wondering if its worth doing. Any thoughts please?
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Old 09-08-2013, 04:10 AM   #2
种.
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I have the Oberon slave and I'm 100 % happy with it. Still I would not change the stock if you dont have any problems with it.
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Old 09-08-2013, 07:15 AM   #3
Pete640
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Oberon and the Evo slaves are virtually the same. Both a vast improvement over the single O ring seal on the OEM part.

If I were buying again Id get the rekluse slave (yes you can buy it by itself). Just as good as the others but its externally adjustable which will help if you ever have problems with the clutch dragging......
Im pretty sure CJ can help with purchasing..
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Old 09-08-2013, 08:09 AM   #4
renogeorge
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I have had a 950 and a 990, both with OEM slaves. No problems at all after 30k+ miles on each. What's all the stink about?
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Old 09-08-2013, 08:12 AM   #5
Pete640
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Could the rest of us be mistaken???
Maybe our slaves never failed after all. A misunderstanding of single seal slaves
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Old 09-08-2013, 08:21 AM   #6
Katoom72
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Quote:
Originally Posted by renogeorge View Post
I have had a 950 and a 990, both with OEM slaves. No problems at all after 30k+ miles on each. What's all the stink about?
Never had a slave blow on my KTM's either.
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Old 09-08-2013, 08:27 AM   #7
renogeorge
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Nothing personal--just sharing my experience......
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Old 09-08-2013, 10:41 AM   #8
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Quote:
Originally Posted by KTM Deano View Post
I've taken a look at the few modifications that people have made to their 990 Adventures and the Oberon clutch slave cylinder seems popular. My bike is only a couple of weeks old and I'm wondering if its worth doing. Any thoughts please?
Depends if you'd rather change it in your garage or on the trail. My 950 went after 20000 miles. Had the Oberon with me on my trip so could have been worse.
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Old 09-08-2013, 10:56 AM   #9
renogeorge
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Not arguing a point here..... But is there some evidence that these after market slaves go more than 20-30K miles? Just curious.

And, why is it that everyone seems to replace the complete cylinder and not just the seal, like you would on a brake cylinder?
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Old 09-08-2013, 01:08 PM   #10
BrooklynOffRoader
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Getting hard to find Nuetral.

I'm experiencing a slight case of Clutch dragging with just under 9000 mi on my 04. Ordered a Oberon cylinder and should arrive any day now. I hope this solves the problem.
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Old 09-08-2013, 01:13 PM   #11
Sporting Wood
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The problem is sintered aluminum + mineral oil + heat + pressure. Its called a solvothermic reaction. Swap to a synthetic fluid that's non reactive with the sintered aluminum cylinder and there is absolutely no issue with the stock unit. 60+k miles and no failures. Same for every one of my customers and friends who I've swapped over to 3w synthetic fork oil.. I could make 35% selling these replacement slave but it really isn't necessary, IMHO.
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Old 09-08-2013, 01:19 PM   #12
Sporting Wood
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Quote:
Originally Posted by renogeorge View Post
Not arguing a point here..... But is there some evidence that these after market slaves go more than 20-30K miles? Just curious.

And, why is it that everyone seems to replace the complete cylinder and not just the seal, like you would on a brake cylinder?

What happens is that the bore erodes, the black in the oil is aluminum oxide. This allows the piston the opportunity to get cocked up and bind in the bore, the clearances being too great. Most often pressure exerted will bleed past causing failure than can be mitigated with a fresh -21 o-ring. Sometimes the piston will crack if it binds up causing it to simply bleed through the crack.
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Old 09-08-2013, 03:45 PM   #13
Katoom72
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Quote:
Originally Posted by Sporting Wood View Post
The problem is sintered aluminum + mineral oil + heat + pressure. Its called a solvothermic reaction. Swap to a synthetic fluid that's non reactive with the sintered aluminum cylinder and there is absolutely no issue with the stock unit. 60+k miles and no failures. Same for every one of my customers and friends who I've swapped over to 3w synthetic fork oil.. I could make 35% selling these replacement slave but it really isn't necessary, IMHO.
That answers why i never had a failure then.
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Old 09-08-2013, 04:26 PM   #14
GrenDesb
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Mine didn't fail the same way.

Cracked piston at the base of the nipple.



I've read the slave has been updated some time, don't know the exact year.
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Old 09-08-2013, 05:41 PM   #15
brooks
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Just lost mine on the way across the country. 07 990 with 19,000 miles, I had to fix the stock one with a .22 oring from carquest in Gunnison CO. it worked for another 5000 miles and just went out again, bad oring the first time, cylinder is scored. I just ordered a new one from KTM twins by sigutech. it has three orings and comes in orange. http://www.ktmtwins.com/ktm-sigutech...slave-cylinder. I ordered a new backer as well to be safe. I was lucky that I found a place and the oring was a decent match. Don't know if you want to wait till you are in the middle of nowhere.
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