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What to do about small countershaft seal leak? #4514592
09/12/17 07:36 PM
09/12/17 07:36 PM
Joined: Oct 2005
Posts: 31
VA
uzun Offline OP
uzun  Offline OP
Joined: Oct 2005
Posts: 31
VA
Hi guys,
I own a 2015 KTM 1290 Super Duke R that developed a small oil leak that seems to be coming from the countershaft seal behind the front sprocket. I think it was caused by the KTM dealer over-tightening the chain at my first service. This is my first chained bike and my fundamental mistake was to assume that the dealer knew what he was doing. So anyway, after discovering the leak, I have loosened up the chain which seems to have helped a bit. But the leak is still there intermittently and it is no more than a few drops when it shows up. I am confident what I am seeing is not the chain lube. I have no intention of going back to this dealer and I am also hesitant to go thru the trouble of replacing the seal at this time since the leak does not appear to be too serious. I am running Motorex 10W-50 oil in the motor by the way and the oil level is below the max line. Is it even worth trying a different viscosity/brand oil to see if that helps with the issue? What would you do?

Re: What to do about small countershaft seal leak? [Re: uzun] #4514625
09/12/17 08:10 PM
09/12/17 08:10 PM
Joined: Mar 2017
Posts: 139
northwest pa
justintendo Offline
justintendo  Offline
Joined: Mar 2017
Posts: 139
northwest pa
investigate if the seal is serviceable externally..if so then a change in the offseason would be a good idea. otherwise i would ignore if it isnt making a mess on the bike or ground.
some bikes the seal is the outer seal of the actual countershaft bearing...where a new bearing is needed to fix the leak.


2013 escape 2.0 awd mobil 1 10w30ep
2008 fusion 2.3 mtx redline 0w20
1996 f150 4.9 2wd mtx mobil 1 10w30hm
1999 kaw zrx 1100 redline 10w40
many husqvarnas
Re: What to do about small countershaft seal leak? [Re: uzun] #4514639
09/12/17 08:29 PM
09/12/17 08:29 PM
Joined: Oct 2005
Posts: 31
VA
uzun Offline OP
uzun  Offline OP
Joined: Oct 2005
Posts: 31
VA
Thanks, I already did some previous investigation about this seal. Fortunately, on this bike model the seal is separate from the bearing and can be serviced externally.

Re: What to do about small countershaft seal leak? [Re: uzun] #4514721
09/12/17 10:39 PM
09/12/17 10:39 PM
Joined: Aug 2010
Posts: 12,913
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,913
Northern Kentucky
ATP205 at the appropriate ratio


2012 Chevy Cruze LT 1.4T - 59k - Edge 0w30 SL + Mahle OX401D
2002 Buick Century 144k - Built 4T65e(Maxlife) - GTX 5w30 + Fram XG3980
Re: What to do about small countershaft seal leak? [Re: uzun] #4514724
09/12/17 10:48 PM
09/12/17 10:48 PM
Joined: Jul 2010
Posts: 19,547
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 19,547
PNW
I doubt it was from over tightening the chain. The big beefy countershaft bearing just can't flex that much, plus the rubber seal lips have some flex. Probably damaged during manufacturing assembly - seen it happen a few times. It takes some miles for the seal to start leaking if there's a burr or some damage to the inner collar or the seal lip.

Re: What to do about small countershaft seal leak? [Re: uzun] #4514745
09/12/17 11:53 PM
09/12/17 11:53 PM
Joined: Dec 2005
Posts: 3,331
The Canyons
02SE Offline
02SE  Offline
Joined: Dec 2005
Posts: 3,331
The Canyons
Personally, I'd fix it or have it fixed. It would be a bad day if the minor leak were to become a major leak at an inopportune time, like leaned over in a fast sweeper..

Last edited by 02SE; 09/12/17 11:54 PM.
Re: What to do about small countershaft seal leak? [Re: uzun] #4514813
09/13/17 05:13 AM
09/13/17 05:13 AM
Joined: Jun 2017
Posts: 220
NY
DdDd Offline
DdDd  Offline
Joined: Jun 2017
Posts: 220
NY
Not a leak. That's the factory KTM chain oiler.


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