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Discussion Starter #1 (Edited)
I discovered a fairly heavy oil leak coming from my exhaust located at the mid-pipe seam, where the stock pipes connect with the Termi half-system. The oil only leaks/sputters out on to the shock and rear tire when on and riding. Needless to say, something ain't right!

I'm new to the 748s, and just wanted to find out some info. The bike is about to have its 12k service and I hope that the issue will be addressed by the service, which was inclusive as part of the bike purchase. Is the problem indicative of bad piston rings and/or need for a serious valve adjustment? Could it be anything worse? Otherwise, the bike appears to idle and run smoothly. Thanks in advance for your advice!
 

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i can think of a few reasons:
blown valve seal on an exhaust valve
seriously bad rings and tons of blow by

they will probably catch what the problem is in the service... but i don't think they'll just fix it for free.
 

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Something you can do is take the exhaust apart and see wich of the two cyniders is the one sending the oil down the exhaust... then, like said above, your bike may be blowing oil past the piston ring for some reason.
 

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look elsewhere,i can't see that much oil coming through the combustion chamber without fouling plugs.
 

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Are you sure that what is coming out of the seam of the pipe is oil? I've seen dirty (cabon-like) contaminated water sputter out of this seam, and getting on the shock.

If it is oil, are you seeing blue smoke out of the rear exhaust?

Sometimes overfilling the oil can cause extra oil to get pushed up thru the crank case vent, and up into the reclaim box, and even into the airbox. Check for this.
 
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if you do have another look, you may also want to check that this isn't oil being spun out from the clutch plates onto the back tire due to a failed seal at the back of the clutch assembly - telltale signs are oil below or surrounding the clutch cover. I suspect it must be worse with a vented cover - my right buttock has firsthand (firstcheek?) experience of a film of oil on the tire which resulted from this.
 

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Two things I would look for

1. Crank Case breather is it working
2. Check how much oil is sparyed in your air filter. If it is very oily, you might have an issue
 
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