Where is this Oil Leak Coming From?

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ted99
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Where is this Oil Leak Coming From?

Post by ted99 » Fri Sep 30, 2016 1:02 am

Hello Everyone,

My bike developed a new oil leak. It leaks onto the header, then almost straight down from there. I can't find the source of the leak. Based on the picture, can anyone tell me who the usual suspects are for this leak? The garage floor is slightly higher at the front of the bike, so the oil is dripping at the top end of the puddle, then going traveling toward the rear. http://ktmsmt.com/download/file.php?mode=view&id=2227
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oil_leak.jpg

ted99
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Re: Where is this Oil Leak Coming From?

Post by ted99 » Fri Sep 30, 2016 1:38 am

Getting closer to the source. Notice drip forming from above the header?
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source.jpg

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Re: Where is this Oil Leak Coming From?

Post by Gimlet » Fri Sep 30, 2016 9:03 am

Could be a drive shaft oil seal behind the front sprocket. You need to to take the sprocket cover off, degrease and get everything clean and dry so you can see what's happening.
Might not be. Might be a minor top-end leak that's dripping onto the crankcase and running down making it look like its coming from somewhere else. Clean, fire up and observe.

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Re: Where is this Oil Leak Coming From?

Post by ted99 » Fri Sep 30, 2016 6:24 pm

Thank Gimlet,

I did just that. Although I clean and lube my chain frequently, I never look at the front sprocket. Under the plastic cover was a ton of dirty grease. It was caked in there, pretty thick, so I cleaned it out. Hopefully it's just accumulated chain lube that built up so much it finally had to leak out somewhere. But if it continues to leak now, it's probably from behind the sprocket, as you say.

I just road it into work this morning. After being parked for an hour, there appears to be a drop forming above the header. We'll see what happens over time...

The bike does go through quite a bit of motor oil, but it always has, so I haven't given it much thought.

Thanks for the input, and I'll keep everyone posted.

Ted

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Re: Where is this Oil Leak Coming From?

Post by Magic Wand » Fri Sep 30, 2016 6:55 pm

Hi ted99

I had something similar on my SMT 2010 some months ago. Oil was coming out from somewhere, and was seen at the exhaust pipe, the shifting lever, under the engine and also on the swinging arm and rear hugger...
IMG_2029.jpg
IMG_2030.jpg
IMG_2031.jpg
IMG_2032.jpg
IMG_2042.jpg
My first thought was that the seal on the main shaft axle is worned out, so I replaced it (don´t do it if you don´t have to!), but it was still leaking from somewhere...

The copper washer on the screw above the oil jet was worn out and I simply turned it around and reused it. Yet it´s not leaking...
Suggest you to take out the oil jet and clean it. Then put a new copper washer in place and tight the screw.

/M

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Re: Where is this Oil Leak Coming From?

Post by ted99 » Fri Sep 30, 2016 10:55 pm

Awesome! I'll try that first. Thanks! Weekend project...

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Re: Where is this Oil Leak Coming From?

Post by ted99 » Sun Oct 02, 2016 5:52 pm

After cleaning and drying everything out, it seems like it's leaking oil out the bottom of this. Is that possible? Do I need to replace a seal behind it? I assume this is a sensor?
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20161002_084313.jpg

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Re: Where is this Oil Leak Coming From?

Post by jmh » Sun Oct 02, 2016 7:12 pm


ted99
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Re: Where is this Oil Leak Coming From?

Post by ted99 » Sun Oct 02, 2016 8:03 pm

That's it! And my bike also has 11,000 miles. Amazing. Thank you!

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Re: Where is this Oil Leak Coming From?

Post by ted99 » Tue Oct 11, 2016 7:15 pm

Fixed. It was the O-ring behind the gear sensor. Thanks for the replies!

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Re: Where is this Oil Leak Coming From?

Post by Motoproponent » Fri Jan 20, 2017 11:22 pm

I have 67,000 miles on my SMT. I've gone through three of those O-rings so far. I suggest you get two or three when it's not leaking and keep it on hand somewhere. It's not a common size and so far I've only been able to source them from a KTM dealer.

It sucks to be not riding, waiting for the shop to open for a $2 part.
If you ain't living on the edge, you're taking up too much room.

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Re: Where is this Oil Leak Coming From?

Post by kennykjam » Sun Aug 27, 2017 9:57 pm

Thanks to the info in this thread, just replaced the rubber behind the gear position sensor and fixed my own own leak. I wonder how long it had been leaking slowly and just burning up on the exhaust before I eventually noticed it. Maybe the bike will stop using so much oil now :-)


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