Someone earlier had mentioned the shift shat seal along with the Stator Wires. Definitely look at those wires. They come out of stator cover toward the rear of the cover...easy to find once you remove the rear (transmission)cover. Be careful with that trans cover as there is a small copper washer on the bottom bolt of that cover to help seal that bolt. ( check that one for leaking as well). With that cover out of the way, you can get at the shifter shaft seal to determine if there is any seepage there, but more importantly you can now see the 2 rubber grommets in the rear of the stator cover...upper one has 2 wires, lower has 3. When I replaced my stator a couple of years ago, one thing was pretty obvious right away. On the stator I removed (unsure if it was OEM or other) the 3 wires running thru that grommet were sealed tight into the grommet. On the new stator those 3 wires were loose in the grommet, being able to slide back and forth. Although I applied a fair bit of RTV to the grommet and around all the wires, I still had oil leaking out past those wires. I tried cleaning the case from the outside and applying more RTV, but the leak continued. It wasn't a lot of oil coming out, but after a couple of hours riding there would be oil blown back along the frame, the exhaust pipe and the kick stand., and when stopped for a while leaned over on the stand, the oil would collect along the bottom edge of the stator cover, or run down the stand, and also drip onto the ground from the kickstand safety switch (just ahead of the stand). Some of the oil might have been leaking from around the cover gasket, but the majority of it was coming from the wires. Not only would it drip from that side of the bike, but the oil would also travel down those wires into the bundle of wires zip-tied together in the centre of the bike just ahead of the shock...which gave the appearance of a leak from the back of the motor. Lots of brake clean, lots of cleaning rags, pulled the cover, cleaned the inside of the cover, removed all the old RTV and very carefully re-applied some quality hi temp oil resistant RTV (Yamabond or equivalent) into that grommet around all 3 wires, from the inside and the outside. I let the RTV cure overnight, applied a light smear of the same RTV to the gaskets as well as the engine and the covers, let them sit for a few minutes, then put the covers on, torqued the bolts and again let it sit overnight before adding oil and running the engine. For the first time in a couple of years the bike doesn't mark it's territory wherever it stops. Zero oil leakage.
As stated in another post, the engine doesn't like being full to the high mark on the oil sight glass. That only leads to oil drips from unexpected places, including the collection of hoses that come out of the bottom of the frame just ahead of the rear shock.
Good luck with the leak hunting.