yep, found oil under my bike. it is coming from higher up than the drain plugs, more like the shaft seal or primary somewhere. Was riding and didn't notice any mechanical problems. Not even sure which oil it is yet, but it looks clean.
I took a pic with my phone, crappy resolution and after I wiped around with a rag, but maybe it might help to see the problem.



Last year the alternator grenaded and the Inner Primary bearing, race and seal were replaced when all that was apart. I would be tempted to replace that seal again, but the front of the pulley is not oily so I doubt it is a problem.
It really doesn't look like a shifter shaft leaking, more like it is coming from behind the drive pulley because the tranny behind the final drive pulley seems the most wet.
Any suggestions?

 

I had removed the pulley locking tab prior to the pics.
I have the 30t pulley to change out the stock pulley, I just need to find a socket to get the nut loose.

 

Strange... one started on mine today in a very similar spot. Trying to narrow it down, and like you said, very clean oil. I am stumped.

 

bump.

 

Well, I seem to be the only one interested in this problem. I am going to post again to show what I have found, just to close the circle a bit...

After progressively upping the attempt to remove the sprocket nut, I have gotten behind the sprocket. I first acquired the correct HD tool for the job and promptly grenaded my 1/2" drive ratchet using a 1/2 to 3/4 adapter and a long piece of pipe. my bad.
I then went and bought the proper 3/4" breaker bar and, with the pipe, couldn't budge it.
The next try was to center punch the nut in 2 places and drill into the nut with a 7/32" bit. Then I simply took a punch and split the nut.
The sprocket slid off like it was buttered.





And here is the seal that was leaking:



If a seal leaks, there has to be a reason, right?





yep, the bearing is hosed. adding oil as it leaked out would have been a catastrophic decision.
I ordered the parts and I hope they will be here tomorrow.

 

If it's a 6 speed that bearing is a double row bearing and I'm thinking you will have to take the trans apart to replace it .
It is #7 in the pic and you can see in the other pic that the inner race
of the inner row of bearings is pressed on the shaft .
Mine had metal shavings all thru the trams so it had to come apart
to clean everything

 

dont forget to change the seal behind the inner primary bearing race on the tranny output shaft to

 

So is that bearing debris in the back side of the seal? Sorry to see you have to go through this, but please keep us posted on your repair.

 

I am wondering if it is possible to hook onto the main drive gear and yank the bearing out with the mainshaft intact?
I am sure that would be possible because it is the basic process described in the service manual, but how hard would it be to install the gear back into the case, without wrecking the mainshaft and the new bearing?

 

yes, I have changed it already prior to removing the sprocket.
I am positive it wasn't leaking, but for the few dollars it costs, I did it anyway.
Both the seal and the inner bearing were installed new last August after I got home from Sturgis and the rivets came loose on the alternator rotor and took out the stator.