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#4514592 - 09/12/17 08:36 PM What to do about small countershaft seal leak?
uzun Offline

Registered: 10/15/05
Posts: 31
Loc: 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?

#4514625 - 09/12/17 09:10 PM Re: What to do about small countershaft seal leak? [Re: uzun]
justintendo Offline

Registered: 03/04/17
Posts: 104
Loc: 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
2008 fusion 2.3 mtx
1996 f150 4.9 2wd mtx
1999 kaw zrx 1100
many husqvarnas

#4514639 - 09/12/17 09:29 PM Re: What to do about small countershaft seal leak? [Re: uzun]
uzun Offline

Registered: 10/15/05
Posts: 31
Loc: 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.

#4514721 - 09/12/17 11:39 PM Re: What to do about small countershaft seal leak? [Re: uzun]
901Memphis Offline

Registered: 08/14/10
Posts: 12897
Loc: Northern Kentucky
ATP205 at the appropriate ratio
2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980

#4514724 - 09/12/17 11:48 PM Re: What to do about small countershaft seal leak? [Re: uzun]
ZeeOSix Offline

Registered: 07/22/10
Posts: 17923
Loc: 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.

#4514745 - 09/13/17 12:53 AM Re: What to do about small countershaft seal leak? [Re: uzun]
02SE Offline

Registered: 12/30/05
Posts: 2768
Loc: 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..

Edited by 02SE (09/13/17 12:54 AM)

#4514813 - 09/13/17 06:13 AM Re: What to do about small countershaft seal leak? [Re: uzun]
DdDd Offline

Registered: 06/08/17
Posts: 191
Loc: NY
Not a leak. That's the factory KTM chain oiler.