I have been chasing the source of an oil leak since I installed this Daytona engine. It has been driving me nuts!
It leaks under crankcase pressure - really noticed it when at the dyno the other day. If parked, there are a few drops initially (the residual) and then it stops.
Think I finally have the source - and it's a bizarre one!
Thought I would share - maybe someone else chasing elusive oil leak.
When I removed the sprocket cover, you could see the trace of oil running all the way down the flange - nothing above that one bolt hole.
It would run off the bottom rear corner of the sprocket cover & drip onto the side-stand switch, then onto the floor.
My last 'guess' (seemed like calculated reasoning at the time!) was that is was coming from the gear selector shaft (also shown in these pics, adjacent to that screw hole). That o-ring was replaced a few months back. Really thought that was it!
But in these images you can see 'muck' around that, but no virgin oil, compared to that on the flange.
These pictures seem pretty conclusive that is coming from the threaded hole! You can actually see the puddle of clean oil in the bottom of it. After the pictures, I took a cotton-bud and could wick it out - definitely originating from in there.
I didn't take picture of this, but there was also oil in the bushing at that location in the sprocket cover.
Not sure yet what to do about a permanent fix - for now I put thread sealant on the screw, we'll see what that does.