Originally Posted by tkorpi
Sounds like it must be clogged. You should be able to see some light through there. Should be roughly .02" or 1/50" in diameter.
The hair thick jet hole is 0.30mm diameter and is really thin. The oil pressure though is high enough to deliver enough oil to the clutch! You could test it connecting it to an elastic hose and pressuring some water from the tab. It is difficult for the light to pass even if some oil is in the hole.