If your oil tank is empty. Then your engine has seriously "Wet Sumped". My theory is that the oil will leak through the drive side main bearings into the primary case and out through the clutch aperture or poorly sealed chain case? Ron
That's what I use in all my bikes. Is your oil tank empty? If your bike has wet sumped (leaked past the oil pump) The first and easiest thing to address is the ball and spring behind the hex plug at the bottom of your timing cover.
Take out the ball and spring and clean out the orifice with a small artist brush and or squirt out with WD40. Give the ball a sharp tap with a thin drift to improve the seat in the ally case......Better still buy a new 1/4" ball and spring from Draganfly or Russells.