Engine case leaking oil?

That bike must be filthy underneath, as a first step a small household steam cleaner will bring it up spotless and then wipe it dry with some kitchen towel, look for a clean dry spot to park it or put a sheet of plywood or hardboard under the bike with some clean kitchen towel under the sump. watch for drips and when you find the general area use some clean kitchen towel and a flashlight to trace the snail trail of oil back to its highest point, because gaskets are held between two almost flat surfaces under pressure they don't just go to hell and you may find something simple to repair under all the grime.

John.

If it were my bike I would fill the bike with kerosene instead of oil for a few minutes, I know it sounds crazy but here is my reasoning..

If the bike is dry of oil due to leakage then all the residue is sticking to the sides of the engine and inside the small oilways, that could cause blockages and restrict the flow, the kerosene will scrub the walls and also be a cheap way of finding where the leak is.

If you have to strip the engine when you find the leak you will drain all the kerosene from all the nooks and crannies and no harm will be done, if the leak is something like a loose filter gasket you can fill with the cheapest engine oil and run the bike for 100 miles to dilute the kerosene and then change the oil for the good stuff.

I'm not telling you to do this, I'm just saying what I would do..

John.