Oil leak from RH side cover

If you do not want to drain the oil, lay the bike (CARFULLY!) down on its left side.. let the oil settle down, Remove the right case, carefully clean ALL the gasket material off the engine case and the cover! make sure there are no dents, dings, scratches, etc on either surface!! Get some quality gasket sealer - NOT ANY FORM OF SILICONE SEALANT!!! I prefer yamabond #4. CARFULLY PUT A small BEAD around the face of the outer case cover face and place the NEW GENUINE OEM GASKET onto the case and make sure its seated fully around the case, you can use the screws to hold it in place until it dries. WAIT until overnight and it fully dried and seated/sealed. Now, carefully put a small amount of good heavy grease on the gasket then carefully install the case ..tightening in a criss-cross pattern until completely seated, then fully tighten all fasteners. If you do it right,, it will NOT leak!

i just average joe, but i vote broken ring...sorry pal.. i recently repaired a bike...same thing was happening...in my case, the thing just had too much oil in it , so much so that it was backing into carb...jus a thought

The o-ring on the filter housing could be the problem, or maybe it was not tightened properly. You will need to clean all the residual oil off, position you bike in the upright position and determine the leak source. Hopefully it's not a case cover. Good luck, i hope this helps.

Sounds like you have a leak on the rocker box lower plate that has the rocker arms in it or the cover that goes over it. Usually it's the cover. Look here for a drawing of that area.
sportster-1200-custom-xl1200c/o/m18599#sch622773">http://www.bikebandit.com/2006-harley-davidson-sportster-1200-custom-xl1200c/o/m18599#sch622773

Good Luck
Steve

valve cover, intake manifold, front crank seal,timing cover, a quart per 1000 miles isnt a small leak.

SOUND LIKE FRONT TIMING COVER CRANK SHAFTSEAL TO OIL PUMP.LEAKING OIL.

Without seeing the bike its really hard to tell but It could be leaking from a sensor (crank position?) and that would just require a new gasket or O-ring. If its your case halves leaking then you are talking a major tear down which could cost $800 to $1200 dollars not including whatever parts they find need replacing.

Once your bike and the oil warms up crevasses can become more leak prone and oil becomes less dense making it easier for it to find its way through open spots. I would get the bike warm and then with the bike still running do a close up inspection to search for the trouble spot. Hopefully its just a top end gasket which has usually been the case with me.